Unsupported clipboard format when pasting PNG/JPG files - delphi

Question

I'm coding a unit where I can paste an image from the clipboard and save it in a DB. The code actually works if I took screenshots or copy images from WhatsApp/Telegram Web.
But the problems appears when I try to paste a PNG or JPG file from the clipboard - the error message is:
Unsupported clipboard format
Why does this code work with screenshots but not with PNG or JPG files? How can I fix it?
BMP := TBitmap.Create;
BMP.Assign(Clipboard); //Here is where I got the exception
BMP.PixelFormat := pf32bit;
JPG := TJPEGImage.Create;
JPG.Assign(BMP);
JPG.CompressionQuality := 75;
AdvOfficeImage1.Picture.Assign(JPG);

Answer 1

If you copy a file from the shell, the clipboard will not contain the contents of the file, but merely the file name.
Hence, you need to obtain this file name, and then use it to load your image.
Here's a small example, just containing a TImage control:
procedure TForm1.FormClick(Sender: TObject);
begin
if Clipboard.HasFormat(CF_HDROP) then
begin
Clipboard.Open;
try
var LDrop := Clipboard.GetAsHandle(CF_HDROP);
if LDrop <> 0 then
begin
var LFileCount := DragQueryFile(LDrop, $FFFFFFFF, nil, 0);
if LFileCount = 1 then
begin
var LSize := DragQueryFile(LDrop, 0, nil, 0);
if LSize <> 0 then
begin
var LFileName: string;
SetLength(LFileName, LSize);
if DragQueryFile(LDrop, 0, PChar(LFileName), LFileName.Length + 1) <> 0 then
Image1.Picture.LoadFromFile(LFileName);
end;
end;
end;
finally
Clipboard.Close;
end;
end;
end;
Note: Clipboard is declared in Clipbrd and DragQueryFile in ShellAPI.