TPngImage.LoadFromStream

gerhardgerhard
edited 5:45AM in FastReport VCL 5
I try to load an image (png) into a TfrxPictureView in the OnBeforePrint event. The png exists in a TMemoryStream (ms in the following code snippets).
This code works fine:
png := TPngImage.Create;
fn := 'c:\temp\1.png';
ms.SaveToFile(fn);
png.LoadFromFile(fn);
Picture1.Picture.Assign(png);
png.Free;

But I don't want to save the MemoryStream to file:
png := TPngImage.Create;
png.LoadFromStream(ms); // this function is not available
Picture1.Picture.Assign(png);
png.Free;

Is there a way to load the data from the MemoryStream into TfrxPictureView without saving it to file?

greetings
Gerhard

Comments

  • gerhardgerhard
    edited 5:45AM
    it can be done in the delphi user function: 
    function GetImageFromURL(url: string; Adress: integer): string;
var ms: TMemoryStream;
    response: integer;
    http: TIdHTTP;
    image: TfrxPictureView;
begin
  http := TIdHTTP.Create(nil);
  ms := TMemoryStream.Create;
  try
    http.Get(url, ms);
    response := http.ResponseCode;
    if response <> 200 then begin
      // ToDo: no modal dialog
      ShowMessage('Error');
      exit;
    end;
    image := TfrxPictureView(pointer(Adress));
    image.LoadPictureFromStream(ms);
  except
    on E: Exception do begin
      // ToDo: no modal dialog
      ShowMessage('Error: ' + E.Message);
    end;
  end;
  ms.free;
  http.Free;
end;

    Script code: 
    procedure Picture1OnBeforePrint(Sender: TfrxComponent);
var url: string;                                  
    p: pointer;                             
begin
  url := 'http://ojw.dev.openstreetmap.org/StaticMap/?'+
         'lat='+<LeiAtom."lat">+
         '&lon='+<LeiAtom."long">+
         '&z=14'+
         '&layer=cloudmade_2'+
         '&mode=Export'+
         '&show=1';
  p := Sender;                                            
  GetImageFromURL(url, p);
end;
  • gpigpi
    edited 5:45AM
    Try to use TfrxReport.OnBeforePrint event
        if Sender.Name = 'Picture1' then
    TfrxPictureView(Sender).LoadPictureFromStream(ms);

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