目的:将控件IMAGE1的图像中一区域拷贝到另一个BMP文件中
这段代码执行后,文件tt.bmp是空的var
bitmap:Tbitmap;
myrect:TRect;
begin
myrect:=rect(0,0,360,480);
bitmap:=Tbitmap.Create;
bitmap.Canvas.CopyRect(myrect,image1.Canvas,myrect);
bitmap.SaveToFile(getcurrentdir+'\tt.bmp');
bitmap.Free;
这段代码执行后,文件tt.bmp是空的var
bitmap:Tbitmap;
myrect:TRect;
begin
myrect:=rect(0,0,360,480);
bitmap:=Tbitmap.Create;
bitmap.Canvas.CopyRect(myrect,image1.Canvas,myrect);
bitmap.SaveToFile(getcurrentdir+'\tt.bmp');
bitmap.Free;
bitmap:=Tbitmap.Create;
bitmap.Canvas.CopyRect(myrect,image1.Canvas,myrect);//你的BMP现在有多大呢?
bitmap.SaveToFile(getcurrentdir+'\tt.bmp');
bitmap.Free;
////////
var
bitmap:Tbitmap;
myrect:TRect;
begin
myrect:=rect(0,0,360,480);
bitmap:=Tbitmap.Create;
try
bitmap.Width:=360;
bitmap.Height:=480;//现在尺寸可以了。
bitmap.Canvas.CopyRect(myrect,image1.Canvas,myrect);
bitmap.SaveToFile(getcurrentdir+'\tt.bmp');
finally
bitmap.Free;
end;
var
bitmap:Tbitmap;
myrect:TRect;
begin
myrect:=rect(0,0,360,480);
bitmap:=Tbitmap.Create;
bitmap.Width:=360;
bitmap.Height:=480;
bitmap.Canvas.CopyRect(myrect,image1.Canvas,myrect);
bitmap.SaveToFile(getcurrentdir+'\tt.bmp');
bitmap.Free;