Question

如何将已在TWebBrowser中下载的图像转换为TPicture，而不将其复制到剪贴板或查看缓存内容。

Answer 1

好的，我做了最后一个回答给你的样本：

首先通过Id获取具有此功能的图像：

function GetImgElementById(const Doc: IDispatch; const id : string): IHTMLImgElement;
var
  Document: IHTMLDocument2;     // IHTMLDocument2 interface of Doc
  Body: IHTMLElement2;          // document body element
  Tags: IHTMLElementCollection; // all tags in document body
  Tag: IHTMLElement;            // a tag in document body
  I: Integer;                   // loops thru tags in document body
begin

  Result :=nil ;
  // Check for valid document: require IHTMLDocument2 interface to it
  if not Supports(Doc, IHTMLDocument2, Document) then
    raise Exception.Create('Invalid HTML document');
  // Check for valid body element: require IHTMLElement2 interface to it
  if not Supports(Document.body, IHTMLElement2, Body) then
    raise Exception.Create('Can''t find <body> element');
  // Get all tags in body element ('*' => any tag name)
  Tags := Body.getElementsByTagName('img');
  // Scan through all tags in body
  for I := 0 to Pred(Tags.length) do
  begin
    // Get reference to a tag
    Tag := Tags.item(I, EmptyParam) as IHTMLElement;
    // Check tag's id and return it if id matches
    if AnsiSameText(Tag.id, id) then
    begin
      Result := Tag as IHTMLImgElement ;
      Break;
    end;
  end;
end;

您可以使用它之后：

var
  img : IHTMLImgElement ;
  rnd : IHTMLElementRender ;
begin
  //
  img := GetImgElementById(wb1.Document,'imgid');
  // img1 is TImage
  img1.Height := img.height ;
  img1.Width := img.width ;
  rnd := img as IHTMLElementRender ;
  rnd.DrawToDC(img1.Canvas.Handle);
end;

不要忘记“MSHTML”单位;

从TWebBrowser到TPicture的图像

1 个答案: