Delphi Exception error loading remote image - delphi

Question

Hi I have the following code:
procedure TformInvoiceDetails.ReadWebImage(imgAddress: string);
var
memStream: TMemoryStream;
begin
memStream := TMemoryStream.Create;
try
IdHTTP1.Get (imgAddress,memStream);
//sleep(5000);
except
imageContProduct.Visible := false;
ShowMessage('Image not found at:'+imgAddress);
memStream.Free;
exit;
end;
try
memStream.Position := 0;
imageContProduct.Visible := true;
imageContProduct.Bitmap.LoadFromStream(memStream);
finally
memStream.Free;
end;
end;
Most of the time it works okay but I keep getting an exeption error and sometimes a 'Image not found at' ( although the image does exist).
If I put the sleep(5000) everything works okay.
So I am presuming the image has not been recived before I try and add to the TImage.
Is there a better method to use ?

Answer 1

You can use another components to load pictures:
uses WinInet, JPEG;
...
function DownloadToStream(Url: string; Stream: TStream): Boolean;
var
hNet: HINTERNET;
hUrl: HINTERNET;
Buffer: array[0..10240] of Char;
BytesRead: DWORD;
begin
Result := FALSE;
hNet := InternetOpen('agent', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
if (hNet <> nil) then
begin
hUrl := InternetOpenUrl(hNet, PChar(Url), nil, 0,
INTERNET_FLAG_RELOAD, 0);
if (hUrl <> nil) then
begin
while (InternetReadFile(hUrl, #Buffer, sizeof(Buffer), BytesRead)) do
begin
if (BytesRead = 0) then
begin
Result := TRUE;
break;
end;
Stream.WriteBuffer(Buffer,BytesRead);
end;
InternetCloseHandle(hUrl);
end;
InternetCloseHandle(hNet);
end;
end;
procedure TformInvoiceDetails.ReadWebImage(imgAddress: string);
var
memStream: TMemoryStream;
Jpg:= TJPEGImage;
begin
memStream:= TMemoryStream.Create;
try
if DownloadToStream(imgAddress, memStream) then
begin
memStream.Seek(0, soFromBeginning);
if (LowerCase(RightStr(imgAddress, 4))='.jpg') or (LowerCase(RightStr(imgAddress, 5))='.jpeg')
try //do the same operation for *.png
Jpg:= TJPEGImage.Create;
Jpg.LoadFromStream(memStream);
imageContProduct.Picture.Bitmap.Assign(Jpg);
imageContProduct.Visible := true;
finally
Jpg.Free;
end
else
try
imageContProduct.Picture.Bitmap.LoadFromStream(memStream);
imageContProduct.Visible := true;
finally
end;
end;
finally
memStream.Free;
end;
end;