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8 | daniel-mar | 1 | unit WebBrowserUtils; |
2 | |||
3 | interface |
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4 | |||
5 | uses |
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6 | // In case ShDocVw_TLB can't be found, use ShDocVw |
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7 | Windows, ShDocVw_TLB, SysUtils, Forms; |
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8 | |||
9 | procedure WaitForBrowser(AWebBrowser: TWebbrowser); |
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10 | |||
11 | function WebBrowserLoadHTML(AWebBrowser: TWebBrowser; const AHTML: string; |
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12 | const AFakeURL: string=''): boolean; |
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13 | |||
14 | type |
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15 | TWebBrowserEx = class helper for TWebBrowser |
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16 | public |
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17 | procedure Clear; |
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18 | procedure Wait; |
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19 | function LoadHTML(const HTML: string; const AFakeURL: string=''): boolean; |
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20 | end; |
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21 | |||
22 | implementation |
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23 | |||
24 | uses |
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25 | ActiveX, urlmon; |
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26 | |||
27 | type |
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28 | (* |
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29 | ILoadHTMLMoniker = interface(IMoniker) |
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30 | ['{DCAE3F41-9B38-40EB-B7D0-4AF0FBFBE5AB}'] |
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31 | procedure InitLoader(sContent, sBaseUrl: string); |
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32 | end; |
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33 | *) |
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34 | TLoadHTMLMoniker = class (TInterfacedObject, IMoniker{, ILoadHTMLMoniker}) |
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35 | private |
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36 | m_stream: IStream; |
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37 | m_sBaseName: string; |
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38 | public |
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39 | procedure InitLoader(sContent, sBaseUrl: string); |
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40 | {$REGION 'IMoniker members'} |
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41 | function BindToObject(const bc: IBindCtx; const mkToLeft: IMoniker; |
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42 | const iidResult: TIID; out vResult): HResult; stdcall; |
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43 | function BindToStorage(const bc: IBindCtx; const mkToLeft: IMoniker; |
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44 | const iid: TIID; out vObj): HResult; stdcall; |
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45 | function Reduce(const bc: IBindCtx; dwReduceHowFar: Longint; |
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46 | mkToLeft: PIMoniker; out mkReduced: IMoniker): HResult; stdcall; |
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47 | function ComposeWith(const mkRight: IMoniker; fOnlyIfNotGeneric: BOOL; |
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48 | out mkComposite: IMoniker): HResult; stdcall; |
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49 | function Enum(fForward: BOOL; out enumMoniker: IEnumMoniker): HResult; |
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50 | stdcall; |
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51 | function IsEqual(const mkOtherMoniker: IMoniker): HResult; stdcall; |
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52 | function Hash(out dwHash: Longint): HResult; stdcall; |
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53 | function IsRunning(const bc: IBindCtx; const mkToLeft: IMoniker; |
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54 | const mkNewlyRunning: IMoniker): HResult; stdcall; |
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55 | function GetTimeOfLastChange(const bc: IBindCtx; const mkToLeft: IMoniker; |
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56 | out filetime: TFileTime): HResult; stdcall; |
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57 | function Inverse(out mk: IMoniker): HResult; stdcall; |
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58 | function CommonPrefixWith(const mkOther: IMoniker; |
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59 | out mkPrefix: IMoniker): HResult; stdcall; |
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60 | function RelativePathTo(const mkOther: IMoniker; |
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61 | out mkRelPath: IMoniker): HResult; stdcall; |
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62 | function GetDisplayName(const bc: IBindCtx; const mkToLeft: IMoniker; |
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63 | out pszDisplayName: POleStr): HResult; stdcall; |
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64 | function ParseDisplayName(const bc: IBindCtx; const mkToLeft: IMoniker; |
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65 | pszDisplayName: POleStr; out chEaten: Longint; |
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66 | out mkOut: IMoniker): HResult; stdcall; |
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67 | function IsSystemMoniker(out dwMksys: Longint): HResult; stdcall; |
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68 | {$ENDREGION} |
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69 | |||
70 | {$REGION 'IPersistStream members'} |
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71 | function IsDirty: HResult; stdcall; |
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72 | function Load(const stm: IStream): HResult; stdcall; |
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73 | function Save(const stm: IStream; fClearDirty: BOOL): HResult; stdcall; |
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74 | function GetSizeMax(out cbSize: Largeint): HResult; stdcall; |
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75 | {$ENDREGION} |
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76 | |||
77 | {$REGION 'IPersist members'} |
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78 | function GetClassID(out classID: TCLSID): HResult; stdcall; |
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79 | {$ENDREGION} |
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80 | end; |
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81 | |||
82 | |||
83 | // http://stackoverflow.com/questions/12605323/globalalloc-causes-my-delphi-app-hang |
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84 | function StrToGlobalHandle(const aText: string): HGLOBAL; |
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85 | var |
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86 | ptr: PChar; |
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87 | begin |
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88 | Result := 0; |
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89 | if aText <> '' then |
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90 | begin |
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91 | Result := GlobalAlloc(GMEM_MOVEABLE or GMEM_ZEROINIT, (length(aText) + 1) * SizeOf(Char)); |
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92 | if Result <> 0 then |
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93 | begin |
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94 | ptr := GlobalLock(Result); |
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95 | if Assigned(ptr) then |
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96 | begin |
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97 | StrCopy(ptr, PChar(aText)); |
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98 | GlobalUnlock(Result); |
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99 | end |
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100 | end; |
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101 | end; |
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102 | end; |
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103 | |||
104 | procedure WaitForBrowser(AWebBrowser: TWebbrowser); |
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105 | begin |
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106 | while (AWebBrowser.ReadyState <> READYSTATE_COMPLETE) and |
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107 | (not Assigned(Application) or not Application.Terminated) do |
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108 | begin |
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109 | if Assigned(Application) then Application.ProcessMessages; |
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110 | Sleep(50); |
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111 | end; |
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112 | end; |
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113 | |||
114 | function WebBrowserLoadHTML(AWebBrowser: TWebBrowser; const AHTML: string; |
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115 | const AFakeURL: string=''): boolean; |
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116 | var |
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117 | bindctx: IBindCtx; |
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118 | pPM: IPersistMoniker; |
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119 | loader: TLoadHTMLMoniker; |
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120 | url: string; |
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121 | begin |
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122 | if AFakeURL <> '' then |
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123 | url := AFakeURL |
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124 | else if AWebBrowser.LocationURL <> '' then |
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125 | url := AWebBrowser.LocationURL |
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126 | else |
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127 | url := 'about:blank'; |
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128 | |||
129 | if AWebBrowser.Document = nil then |
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130 | begin |
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131 | AWebBrowser.Navigate('about:blank'); |
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132 | WaitForBrowser(AWebBrowser); |
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133 | end; |
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134 | |||
135 | pPM := AWebBrowser.Document as IPersistMoniker; |
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136 | if (pPM = nil) then Exit(false); |
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137 | |||
138 | bindctx := nil; |
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139 | CreateBindCtx(0, bindctx); |
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140 | if (bindctx = nil) then Exit(false); |
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141 | |||
142 | try |
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143 | loader := TLoadHTMLMoniker.Create; |
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144 | loader.InitLoader(AHTML, url); |
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145 | except |
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146 | Exit(false); |
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147 | end; |
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148 | |||
149 | result := pPM.Load(true, loader, bindctx, STGM_READ) = S_OK; |
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150 | |||
151 | if not result and Assigned(loader) then FreeAndNil(loader); |
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152 | end; |
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153 | |||
154 | { TLoadHTMLMoniker } |
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155 | |||
156 | // TLoadHTMLMoniker. Translated from C# to Delphi by Daniel Marschall |
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157 | // Resources: |
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158 | // - http://stackoverflow.com/questions/40927080/relative-urls-in-a-twebbrowser-containing-custom-html-code |
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159 | // - https://github.com/kuza55/csexwb2/blob/master/General_Classes/LoadHTMLMoniker.cs |
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160 | // - https://github.com/kuza55/csexwb2/blob/master/cEXWB.cs#L1769 |
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161 | |||
162 | procedure TLoadHTMLMoniker.InitLoader(sContent, sBaseUrl: string); |
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163 | resourcestring |
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164 | SCannotAllocMemory = 'Cannot create IStream.'; |
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165 | var |
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166 | hr: integer; |
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167 | begin |
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168 | m_sBaseName := sBaseUrl; |
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169 | hr := CreateStreamOnHGlobal(StrToGlobalHandle(sContent), true, m_stream); |
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170 | if ((hr <> S_OK) or (m_stream = nil)) then raise Exception.Create(SCannotAllocMemory); |
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171 | end; |
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172 | |||
173 | function TLoadHTMLMoniker.GetDisplayName(const bc: IBindCtx; |
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174 | const mkToLeft: IMoniker; out pszDisplayName: POleStr): HResult; |
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175 | var |
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176 | bufSize: integer; |
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177 | wTest: WideString; |
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178 | begin |
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179 | // pszDisplayName := PWideChar(WideString(m_sBaseName)); |
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180 | |||
181 | // I am not sure if that is correct...... |
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182 | bufSize := (Length(m_sBaseName)+1) * SizeOf(WideChar); |
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183 | pszDisplayName := CoTaskMemAlloc(bufSize); |
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184 | wTest := m_sBaseName; |
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185 | CopyMemory(pszDisplayName, PWideChar(wTest), bufSize); |
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186 | |||
187 | result := S_OK; |
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188 | end; |
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189 | |||
190 | function TLoadHTMLMoniker.BindToStorage(const bc: IBindCtx; |
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191 | const mkToLeft: IMoniker; const iid: TIID; out vObj): HResult; |
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192 | const |
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193 | IID_IStream: TGUID = '{0000000C-0000-0000-C000-000000000046}'; |
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194 | begin |
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195 | if IsEqualIID(iid, IID_IStream) then |
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196 | begin |
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197 | IStream(vObj) := m_stream; |
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198 | result := S_OK; |
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199 | end |
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200 | else |
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201 | begin |
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202 | IStream(vObj) := nil; |
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203 | result := E_NOINTERFACE; |
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204 | end; |
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205 | end; |
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206 | |||
207 | {$REGION 'Not implemented'} |
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208 | function TLoadHTMLMoniker.BindToObject(const bc: IBindCtx; |
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209 | const mkToLeft: IMoniker; const iidResult: TIID; out vResult): HResult; |
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210 | begin |
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211 | result := E_NOTIMPL; |
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212 | end; |
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213 | |||
214 | function TLoadHTMLMoniker.CommonPrefixWith(const mkOther: IMoniker; |
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215 | out mkPrefix: IMoniker): HResult; |
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216 | begin |
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217 | result := E_NOTIMPL; |
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218 | end; |
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219 | |||
220 | function TLoadHTMLMoniker.ComposeWith(const mkRight: IMoniker; |
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221 | fOnlyIfNotGeneric: BOOL; out mkComposite: IMoniker): HResult; |
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222 | begin |
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223 | result := E_NOTIMPL; |
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224 | end; |
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225 | |||
226 | function TLoadHTMLMoniker.Enum(fForward: BOOL; |
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227 | out enumMoniker: IEnumMoniker): HResult; |
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228 | begin |
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229 | result := E_NOTIMPL; |
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230 | end; |
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231 | |||
232 | function TLoadHTMLMoniker.GetClassID(out classID: TCLSID): HResult; |
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233 | begin |
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234 | result := E_NOTIMPL; |
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235 | end; |
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236 | |||
237 | function TLoadHTMLMoniker.GetSizeMax(out cbSize: Largeint): HResult; |
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238 | begin |
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239 | result := E_NOTIMPL; |
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240 | end; |
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241 | |||
242 | function TLoadHTMLMoniker.GetTimeOfLastChange(const bc: IBindCtx; |
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243 | const mkToLeft: IMoniker; out filetime: TFileTime): HResult; |
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244 | begin |
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245 | result := E_NOTIMPL; |
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246 | end; |
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247 | |||
248 | function TLoadHTMLMoniker.Hash(out dwHash: Integer): HResult; |
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249 | begin |
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250 | result := E_NOTIMPL; |
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251 | end; |
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252 | |||
253 | function TLoadHTMLMoniker.Inverse(out mk: IMoniker): HResult; |
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254 | begin |
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255 | result := E_NOTIMPL; |
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256 | end; |
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257 | |||
258 | function TLoadHTMLMoniker.IsDirty: HResult; |
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259 | begin |
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260 | result := E_NOTIMPL; |
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261 | end; |
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262 | |||
263 | function TLoadHTMLMoniker.IsEqual(const mkOtherMoniker: IMoniker): HResult; |
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264 | begin |
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265 | result := E_NOTIMPL; |
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266 | end; |
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267 | |||
268 | function TLoadHTMLMoniker.IsRunning(const bc: IBindCtx; const mkToLeft, |
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269 | mkNewlyRunning: IMoniker): HResult; |
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270 | begin |
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271 | result := E_NOTIMPL; |
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272 | end; |
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273 | |||
274 | function TLoadHTMLMoniker.IsSystemMoniker(out dwMksys: Integer): HResult; |
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275 | begin |
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276 | result := E_NOTIMPL; |
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277 | end; |
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278 | |||
279 | function TLoadHTMLMoniker.Load(const stm: IStream): HResult; |
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280 | begin |
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281 | result := E_NOTIMPL; |
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282 | end; |
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283 | |||
284 | function TLoadHTMLMoniker.ParseDisplayName(const bc: IBindCtx; |
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285 | const mkToLeft: IMoniker; pszDisplayName: POleStr; out chEaten: Integer; |
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286 | out mkOut: IMoniker): HResult; |
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287 | begin |
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288 | result := E_NOTIMPL; |
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289 | end; |
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290 | |||
291 | function TLoadHTMLMoniker.Reduce(const bc: IBindCtx; dwReduceHowFar: Integer; |
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292 | mkToLeft: PIMoniker; out mkReduced: IMoniker): 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.RelativePathTo(const mkOther: IMoniker; |
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298 | out mkRelPath: IMoniker): HResult; |
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299 | begin |
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300 | result := E_NOTIMPL; |
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301 | end; |
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302 | |||
303 | function TLoadHTMLMoniker.Save(const stm: IStream; fClearDirty: BOOL): HResult; |
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304 | begin |
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305 | result := E_NOTIMPL; |
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306 | end; |
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307 | {$ENDREGION} |
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308 | |||
309 | { TWebBrowserEx } |
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310 | |||
311 | procedure TWebBrowserEx.Wait; |
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312 | begin |
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313 | WaitForBrowser(Self); |
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314 | end; |
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315 | |||
316 | function TWebBrowserEx.LoadHTML(const HTML: string; const AFakeURL: string=''): boolean; |
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317 | begin |
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318 | result := WebBrowserLoadHTML(Self, HTML, AFakeURL); |
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319 | Self.Wait; |
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320 | end; |
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321 | |||
322 | procedure TWebBrowserEx.Clear; |
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323 | begin |
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324 | Self.LoadHTML('', 'about:blank'); |
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325 | end; |
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326 | |||
327 | end. |