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8 | daniel-mar | 1 | unit WebBrowserUtils; |
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25 | daniel-mar | 3 | {$Include 'FastPHP.inc'} |
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8 | daniel-mar | 5 | interface |
6 | |||
7 | uses |
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27 | daniel-mar | 8 | Windows, {$IFDEF USE_SHDOCVW_TLB}ShDocVw_TLB{$ELSE}ShDocVw{$ENDIF}, SysUtils, Forms; |
8 | daniel-mar | 9 | |
10 | procedure WaitForBrowser(AWebBrowser: TWebbrowser); |
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11 | |||
12 | function WebBrowserLoadHTML(AWebBrowser: TWebBrowser; const AHTML: string; |
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13 | const AFakeURL: string=''): boolean; |
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14 | |||
15 | type |
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16 | TWebBrowserEx = class helper for TWebBrowser |
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17 | public |
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18 | procedure Clear; |
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19 | procedure Wait; |
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20 | function LoadHTML(const HTML: string; const AFakeURL: string=''): boolean; |
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21 | end; |
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22 | |||
23 | implementation |
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24 | |||
25 | uses |
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26 | ActiveX, urlmon; |
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27 | |||
28 | type |
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29 | (* |
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30 | ILoadHTMLMoniker = interface(IMoniker) |
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31 | ['{DCAE3F41-9B38-40EB-B7D0-4AF0FBFBE5AB}'] |
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32 | procedure InitLoader(sContent, sBaseUrl: string); |
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33 | end; |
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34 | *) |
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35 | TLoadHTMLMoniker = class (TInterfacedObject, IMoniker{, ILoadHTMLMoniker}) |
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36 | private |
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37 | m_stream: IStream; |
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38 | m_sBaseName: string; |
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39 | public |
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40 | procedure InitLoader(sContent, sBaseUrl: string); |
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41 | {$REGION 'IMoniker members'} |
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42 | function BindToObject(const bc: IBindCtx; const mkToLeft: IMoniker; |
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43 | const iidResult: TIID; out vResult): HResult; stdcall; |
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44 | function BindToStorage(const bc: IBindCtx; const mkToLeft: IMoniker; |
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45 | const iid: TIID; out vObj): HResult; stdcall; |
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46 | function Reduce(const bc: IBindCtx; dwReduceHowFar: Longint; |
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47 | mkToLeft: PIMoniker; out mkReduced: IMoniker): HResult; stdcall; |
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48 | function ComposeWith(const mkRight: IMoniker; fOnlyIfNotGeneric: BOOL; |
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49 | out mkComposite: IMoniker): HResult; stdcall; |
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50 | function Enum(fForward: BOOL; out enumMoniker: IEnumMoniker): HResult; |
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51 | stdcall; |
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52 | function IsEqual(const mkOtherMoniker: IMoniker): HResult; stdcall; |
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53 | function Hash(out dwHash: Longint): HResult; stdcall; |
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54 | function IsRunning(const bc: IBindCtx; const mkToLeft: IMoniker; |
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55 | const mkNewlyRunning: IMoniker): HResult; stdcall; |
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56 | function GetTimeOfLastChange(const bc: IBindCtx; const mkToLeft: IMoniker; |
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57 | out filetime: TFileTime): HResult; stdcall; |
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58 | function Inverse(out mk: IMoniker): HResult; stdcall; |
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59 | function CommonPrefixWith(const mkOther: IMoniker; |
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60 | out mkPrefix: IMoniker): HResult; stdcall; |
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61 | function RelativePathTo(const mkOther: IMoniker; |
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62 | out mkRelPath: IMoniker): HResult; stdcall; |
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63 | function GetDisplayName(const bc: IBindCtx; const mkToLeft: IMoniker; |
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64 | out pszDisplayName: POleStr): HResult; stdcall; |
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65 | function ParseDisplayName(const bc: IBindCtx; const mkToLeft: IMoniker; |
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66 | pszDisplayName: POleStr; out chEaten: Longint; |
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67 | out mkOut: IMoniker): HResult; stdcall; |
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68 | function IsSystemMoniker(out dwMksys: Longint): HResult; stdcall; |
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69 | {$ENDREGION} |
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70 | |||
71 | {$REGION 'IPersistStream members'} |
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72 | function IsDirty: HResult; stdcall; |
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73 | function Load(const stm: IStream): HResult; stdcall; |
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74 | function Save(const stm: IStream; fClearDirty: BOOL): HResult; stdcall; |
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75 | function GetSizeMax(out cbSize: Largeint): HResult; stdcall; |
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76 | {$ENDREGION} |
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77 | |||
78 | {$REGION 'IPersist members'} |
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79 | function GetClassID(out classID: TCLSID): HResult; stdcall; |
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80 | {$ENDREGION} |
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81 | end; |
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82 | |||
83 | |||
84 | // http://stackoverflow.com/questions/12605323/globalalloc-causes-my-delphi-app-hang |
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85 | function StrToGlobalHandle(const aText: string): HGLOBAL; |
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86 | var |
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87 | ptr: PChar; |
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88 | begin |
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89 | Result := 0; |
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90 | if aText <> '' then |
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91 | begin |
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92 | Result := GlobalAlloc(GMEM_MOVEABLE or GMEM_ZEROINIT, (length(aText) + 1) * SizeOf(Char)); |
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93 | if Result <> 0 then |
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94 | begin |
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95 | ptr := GlobalLock(Result); |
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96 | if Assigned(ptr) then |
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97 | begin |
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98 | StrCopy(ptr, PChar(aText)); |
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99 | GlobalUnlock(Result); |
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100 | end |
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101 | end; |
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102 | end; |
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103 | end; |
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104 | |||
105 | procedure WaitForBrowser(AWebBrowser: TWebbrowser); |
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106 | begin |
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107 | while (AWebBrowser.ReadyState <> READYSTATE_COMPLETE) and |
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108 | (not Assigned(Application) or not Application.Terminated) do |
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109 | begin |
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110 | if Assigned(Application) then Application.ProcessMessages; |
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111 | Sleep(50); |
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112 | end; |
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113 | end; |
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114 | |||
115 | function WebBrowserLoadHTML(AWebBrowser: TWebBrowser; const AHTML: string; |
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116 | const AFakeURL: string=''): boolean; |
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117 | var |
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118 | bindctx: IBindCtx; |
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119 | pPM: IPersistMoniker; |
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120 | loader: TLoadHTMLMoniker; |
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121 | url: string; |
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122 | begin |
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123 | if AFakeURL <> '' then |
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124 | url := AFakeURL |
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125 | else if AWebBrowser.LocationURL <> '' then |
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126 | url := AWebBrowser.LocationURL |
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127 | else |
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128 | url := 'about:blank'; |
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129 | |||
130 | if AWebBrowser.Document = nil then |
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131 | begin |
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132 | AWebBrowser.Navigate('about:blank'); |
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133 | WaitForBrowser(AWebBrowser); |
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134 | end; |
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135 | |||
136 | pPM := AWebBrowser.Document as IPersistMoniker; |
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25 | daniel-mar | 137 | if (pPM = nil) then |
138 | begin |
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139 | result := false; |
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140 | exit; |
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141 | end; |
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8 | daniel-mar | 142 | |
143 | bindctx := nil; |
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144 | CreateBindCtx(0, bindctx); |
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25 | daniel-mar | 145 | if (bindctx = nil) then |
146 | begin |
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147 | result := false; |
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148 | exit; |
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149 | end; |
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8 | daniel-mar | 150 | |
151 | try |
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44 | daniel-mar | 152 | // TODO: Delphi2007 and FastMM4 say that here we have a memory leak |
8 | daniel-mar | 153 | loader := TLoadHTMLMoniker.Create; |
44 | daniel-mar | 154 | |
8 | daniel-mar | 155 | loader.InitLoader(AHTML, url); |
156 | except |
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44 | daniel-mar | 157 | if Assigned(loader) then FreeAndNil(loader); |
25 | daniel-mar | 158 | result := false; |
159 | exit; |
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8 | daniel-mar | 160 | end; |
161 | |||
162 | result := pPM.Load(true, loader, bindctx, STGM_READ) = S_OK; |
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163 | |||
164 | if not result and Assigned(loader) then FreeAndNil(loader); |
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165 | end; |
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166 | |||
167 | { TLoadHTMLMoniker } |
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168 | |||
169 | // TLoadHTMLMoniker. Translated from C# to Delphi by Daniel Marschall |
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170 | // Resources: |
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171 | // - http://stackoverflow.com/questions/40927080/relative-urls-in-a-twebbrowser-containing-custom-html-code |
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172 | // - https://github.com/kuza55/csexwb2/blob/master/General_Classes/LoadHTMLMoniker.cs |
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173 | // - https://github.com/kuza55/csexwb2/blob/master/cEXWB.cs#L1769 |
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174 | |||
175 | procedure TLoadHTMLMoniker.InitLoader(sContent, sBaseUrl: string); |
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176 | resourcestring |
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177 | SCannotAllocMemory = 'Cannot create IStream.'; |
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178 | var |
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179 | hr: integer; |
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180 | begin |
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181 | m_sBaseName := sBaseUrl; |
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182 | hr := CreateStreamOnHGlobal(StrToGlobalHandle(sContent), true, m_stream); |
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183 | if ((hr <> S_OK) or (m_stream = nil)) then raise Exception.Create(SCannotAllocMemory); |
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184 | end; |
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185 | |||
186 | function TLoadHTMLMoniker.GetDisplayName(const bc: IBindCtx; |
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187 | const mkToLeft: IMoniker; out pszDisplayName: POleStr): HResult; |
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188 | var |
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189 | bufSize: integer; |
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190 | wTest: WideString; |
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191 | begin |
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192 | // pszDisplayName := PWideChar(WideString(m_sBaseName)); |
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193 | |||
194 | // I am not sure if that is correct...... |
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195 | bufSize := (Length(m_sBaseName)+1) * SizeOf(WideChar); |
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196 | pszDisplayName := CoTaskMemAlloc(bufSize); |
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197 | wTest := m_sBaseName; |
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198 | CopyMemory(pszDisplayName, PWideChar(wTest), bufSize); |
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199 | |||
200 | result := S_OK; |
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201 | end; |
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202 | |||
203 | function TLoadHTMLMoniker.BindToStorage(const bc: IBindCtx; |
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204 | const mkToLeft: IMoniker; const iid: TIID; out vObj): HResult; |
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205 | const |
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206 | IID_IStream: TGUID = '{0000000C-0000-0000-C000-000000000046}'; |
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207 | begin |
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208 | if IsEqualIID(iid, IID_IStream) then |
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209 | begin |
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210 | IStream(vObj) := m_stream; |
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211 | result := S_OK; |
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212 | end |
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213 | else |
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214 | begin |
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215 | IStream(vObj) := nil; |
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216 | result := E_NOINTERFACE; |
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217 | end; |
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218 | end; |
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219 | |||
220 | {$REGION 'Not implemented'} |
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221 | function TLoadHTMLMoniker.BindToObject(const bc: IBindCtx; |
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222 | const mkToLeft: IMoniker; const iidResult: TIID; out vResult): HResult; |
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223 | begin |
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224 | result := E_NOTIMPL; |
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225 | end; |
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226 | |||
227 | function TLoadHTMLMoniker.CommonPrefixWith(const mkOther: IMoniker; |
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228 | out mkPrefix: IMoniker): HResult; |
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229 | begin |
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230 | result := E_NOTIMPL; |
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231 | end; |
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232 | |||
233 | function TLoadHTMLMoniker.ComposeWith(const mkRight: IMoniker; |
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234 | fOnlyIfNotGeneric: BOOL; out mkComposite: IMoniker): HResult; |
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235 | begin |
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236 | result := E_NOTIMPL; |
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237 | end; |
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238 | |||
239 | function TLoadHTMLMoniker.Enum(fForward: BOOL; |
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240 | out enumMoniker: IEnumMoniker): HResult; |
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241 | begin |
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242 | result := E_NOTIMPL; |
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243 | end; |
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244 | |||
245 | function TLoadHTMLMoniker.GetClassID(out classID: TCLSID): HResult; |
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246 | begin |
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247 | result := E_NOTIMPL; |
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248 | end; |
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249 | |||
250 | function TLoadHTMLMoniker.GetSizeMax(out cbSize: Largeint): HResult; |
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251 | begin |
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252 | result := E_NOTIMPL; |
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253 | end; |
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254 | |||
255 | function TLoadHTMLMoniker.GetTimeOfLastChange(const bc: IBindCtx; |
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256 | const mkToLeft: IMoniker; out filetime: TFileTime): HResult; |
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257 | begin |
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258 | result := E_NOTIMPL; |
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259 | end; |
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260 | |||
261 | function TLoadHTMLMoniker.Hash(out dwHash: Integer): HResult; |
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262 | begin |
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263 | result := E_NOTIMPL; |
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264 | end; |
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265 | |||
266 | function TLoadHTMLMoniker.Inverse(out mk: IMoniker): HResult; |
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267 | begin |
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268 | result := E_NOTIMPL; |
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269 | end; |
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270 | |||
271 | function TLoadHTMLMoniker.IsDirty: HResult; |
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272 | begin |
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273 | result := E_NOTIMPL; |
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274 | end; |
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275 | |||
276 | function TLoadHTMLMoniker.IsEqual(const mkOtherMoniker: IMoniker): HResult; |
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277 | begin |
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278 | result := E_NOTIMPL; |
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279 | end; |
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280 | |||
281 | function TLoadHTMLMoniker.IsRunning(const bc: IBindCtx; const mkToLeft, |
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282 | mkNewlyRunning: IMoniker): HResult; |
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283 | begin |
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284 | result := E_NOTIMPL; |
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285 | end; |
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286 | |||
287 | function TLoadHTMLMoniker.IsSystemMoniker(out dwMksys: Integer): HResult; |
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288 | begin |
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289 | result := E_NOTIMPL; |
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290 | end; |
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291 | |||
292 | function TLoadHTMLMoniker.Load(const stm: IStream): HResult; |
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293 | begin |
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294 | result := E_NOTIMPL; |
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295 | end; |
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296 | |||
297 | function TLoadHTMLMoniker.ParseDisplayName(const bc: IBindCtx; |
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298 | const mkToLeft: IMoniker; pszDisplayName: POleStr; out chEaten: Integer; |
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299 | out mkOut: IMoniker): HResult; |
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300 | begin |
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301 | result := E_NOTIMPL; |
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302 | end; |
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303 | |||
304 | function TLoadHTMLMoniker.Reduce(const bc: IBindCtx; dwReduceHowFar: Integer; |
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305 | mkToLeft: PIMoniker; out mkReduced: IMoniker): HResult; |
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306 | begin |
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307 | result := E_NOTIMPL; |
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308 | end; |
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309 | |||
310 | function TLoadHTMLMoniker.RelativePathTo(const mkOther: IMoniker; |
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311 | out mkRelPath: IMoniker): HResult; |
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312 | begin |
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313 | result := E_NOTIMPL; |
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314 | end; |
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315 | |||
316 | function TLoadHTMLMoniker.Save(const stm: IStream; fClearDirty: BOOL): HResult; |
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317 | begin |
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318 | result := E_NOTIMPL; |
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319 | end; |
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320 | {$ENDREGION} |
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321 | |||
322 | { TWebBrowserEx } |
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323 | |||
324 | procedure TWebBrowserEx.Wait; |
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325 | begin |
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326 | WaitForBrowser(Self); |
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327 | end; |
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328 | |||
329 | function TWebBrowserEx.LoadHTML(const HTML: string; const AFakeURL: string=''): boolean; |
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330 | begin |
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331 | result := WebBrowserLoadHTML(Self, HTML, AFakeURL); |
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332 | Self.Wait; |
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333 | end; |
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334 | |||
335 | procedure TWebBrowserEx.Clear; |
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336 | begin |
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337 | Self.LoadHTML('', 'about:blank'); |
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338 | end; |
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339 | |||
340 | end. |