|
 Forum
Grundkurs
»Introduktion
»Snabbguide
»Komponenter
»Händelser
»Strängar
»Räkna med Delphi »Egna
typer
»Selektion
»Iteration
»Menyer
»Funktioner
»Arraystrukturer
Tips & Tricks
»Nya tips
»Blandat
»Databaser
»Filer
»Forms
»Grafik
»Internet
»Komponenter
»Matematik
»Multimedia
»Objekt/ActiveX
»Skrivare
»Strängar
»System
»Mest lästa tips
Artiklar
»Delphi och ADO
»Bygga en DLL
»Skapa en enkel rapport
»Hantera registret
»Enheter, units
»Klassen TCanvas
»Använd LookUp Controls
 Nya
tips
 Lägg
till tips
 Delphilänkar
 Gästbok
|
|
|
|
|
|
Returnera alla bildlänkar i HTML-dokument
|
Kategori: Internet
Inlagt: 2005-08-23
Läst: 1381
Inlagt av: Staffan Berg
|
|
Beskrivning |
|
Detta exempel returnerar alla länkar till bilder som finns i angivet HTML-dokument. Dessa skrivs sedan i i en TMemo. Observera klasserna i uses-lista.
|
|
Kod |
uses mshtml, ActiveX, COMObj, IdHTTP, idURI;
{ .... }
procedure GetImageLinks(AURL: string ; AList: TStrings);
var
IDoc: IHTMLDocument2;
strHTML: string ;
v: Variant;
x: Integer;
ovLinks: OleVariant;
DocURL: string ;
URI: TidURI;
ImgURL: string ;
idHTTP: TidHTTP;
begin
AList.Clear;
URI := TidURI.Create(AURL);
try
DocURL := 'http://' + URI.Host;
if URI.Path <> '/' then
DocURL := DocURL + URI.Path;
finally
URI.Free;
end;
Idoc := CreateComObject(Class_HTMLDocument) as IHTMLDocument2;
try
IDoc.designMode := 'on';
while IDoc.readyState <> 'complete' do
Application.ProcessMessages;
v := VarArrayCreate([0, 0], VarVariant);
idHTTP := TidHTTP.Create(nil);
try
strHTML := idHTTP.Get(AURL);
finally
idHTTP.Free;
end;
v[0] := strHTML;
IDoc.Write(PSafeArray(System.TVarData(v).VArray));
IDoc.designMode := 'off';
while IDoc.readyState <> 'complete' do
Application.ProcessMessages;
ovLinks := IDoc.all.tags('IMG');
if ovLinks.Length > 0 then
begin
for x := 0 to ovLinks.Length - 1 do
begin
ImgURL := ovLinks.Item(x).src;
// The stuff below will probably need a little tweaking
// Deteriming and turning realtive URLs into absolute URLs
// is not that difficult but this is all I could come up with
// in such a short notice.
if (ImgURL[1] = '/') then
begin
// more than likely a relative URL so
// append the DocURL
ImgURL := DocURL + ImgUrl;
end
else
begin
if (Copy(ImgURL, 1, 11) = 'about:blank') then
begin
ImgURL := DocURL + Copy(ImgUrl, 12, Length(ImgURL));
end;
end;
AList.Add(ImgURL);
end;
end;
finally
IDoc := nil;
end;
end;
// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
GetImageLinks('http://www.fuzzydizzie.com, Memo1.Lines);
end;
|
|
|