//由于dxCameraControl 直接拍照图片保存普遍比较大，大约3M左右，故需要压缩
procedure TFormMain.capturePic(tmpStr: string);
var
  filePathName: string;
  JPEGImage: TJPEGImage;
begin
  if Trim(spath) <> '' then
  begin
    if not DirectoryExists(spath) then
    begin
      ForceDirectories(spath);
    end;

    filePathName := spath + tmpStr+ '.jpg';
//    dxCameraControl1.CapturedBitmap.CompressData := True;
    dxCameraControl1.Capture;
//    dxCameraControl1.CapturedBitmap.Height := 600;
//    dxCameraControl1.CapturedBitmap.Width := 800;
    cxImage1.Picture.Assign(dxCameraControl1.CapturedBitmap);
    cxImage1.Picture.SaveToFile(filePathName);

    JPEGImage := TJPEGImage.Create;
    JPEGImage.Assign(cxImage1.Picture.Graphic);
    JPEGImage.CompressionQuality := 25;
    JPEGImage.Compress;
    JPEGImage.SaveToFile(filePathName);

  end;
end;