Title: Retrieve image properties of all images in a TWebbrowser
Question: How to retrieve the height, width, file size etc. of all images in a TWebbrowser Document
Answer:
The IHTMLImgElement Interface provides access to some of the properties and methods supported by the img element and the input element of the image type. The other properties and methods are accessible through the IHTMLImgElement interface.
Reference:
http://msdn.microsoft.com/library/default.asp?url=/workshop/browser/mshtml/reference/ifaces/imgelement/ihtmlimgelement.asp
uses
MSHTML_TLB;
// First navigate to a page
procedure TForm1.Button1Click(Sender: TObject);
begin
Webbrowser1.Navigate('www.google.com');
end;
// Then execute the following code:
procedure TForm1.Button2Click(Sender: TObject);
var
i: Word;
ImageWidth, ImageHeight: Integer;
ImageHref, ImageFileSize, ImageTextAlternative: string;
Document: IHtmlDocument2;
begin
// Loop through all images of a TWebbrowser
for i := 0 to WebBrowser1.OleObject.Document.Images.Length - 1 do
begin
Document := WebBrowser1.Document as IHtmlDocument2;
// Retrieves the calculated width of the image.
ImageWidth := WebBrowser1.OleObject.Document.Images.Item(i).Width;
// Retrieves the height of the image.
ImageHeight := WebBrowser1.OleObject.Document.Images.Item(i).Height;
// Retrieves the file size of the image.
ImageFileSize := (Document.Images.Item(i, 0) as IHTMLImgElement).FileSize;
// Retrieves the entire URL that the browser uses to locate the image
ImageHref := (Document.Images.Item(i, 0) as IHTMLImgElement).Href;
// Retrieves a text alternative to the graphic.
ImageTextAlternative := (Document.Images.Item(i, 0) as IHTMLImgElement).alt;
// Show image information in a TListbox
ListBox1.Items.Add(Format('%s : %d x %d Pixels; %s Bytes; %s',
[ImageHref, ImageWidth, ImageHeight, ImageFileSize, ImageTextAlternative]));
end;
end;