delphi图片格式判断
procedure TForm1.CheckImgType(fn: string);
var
MyImage: TMemoryStream;
Buffer: Word;
i: integer;
begin
MyImage := TMemoryStream.Create;
try
MyImage.LoadFromFile(fn);
MyImage.Position := 0;
if MyImage.Size = 0 then
begin
ShowMessage('错误');
Exit;
end;
MyImage.ReadBuffer(Buffer, 2);
if Buffer = $4D42 then
begin
ShowMessage('BMP');
end
else if Buffer = $D8FF then
begin
ShowMessage('JPEG');
end
else if Buffer = $4947 then
begin
ShowMessage('GIF');
end
else if Buffer = $050A then
begin
ShowMessage('PCX');
end
else if Buffer = $5089 then
begin
ShowMessage('PNG');
end
else if Buffer = $4238 then
begin
ShowMessage('PSD');
end
else if Buffer = $A659 then
begin
ShowMessage('RAS');
end
else if Buffer = $DA01 then
begin
ShowMessage('SGI');
end
else if Buffer = $4949 then
begin
ShowMessage('TIFF');
end
else //如是其他类型的文件的话，直接显示错误
begin
ShowMessage('ERR');
end;
finally
MyImage.Free;
end;
end;
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