/// 将容器内容转成图片导出,这里的controller就是this
/// </summary>
private void OutTheControllerToPic()
{
Bitmap bitmap = new Bitmap( this.Width, this .Height);
DrawToBitmap( this, bitmap, new Rectangle(0, 0, this.Width, this .Height));
bool isSave = true ;
SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "图片保存" ;
saveImageDialog.Filter = @"png|*.png|jpeg|*.jpg|bmp|*.bmp|gif|*.gif" ;
if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveImageDialog.FileName.ToString();
if (fileName != "" && fileName != null)
{
string fileExtName = fileName.Substring(fileName.LastIndexOf(".") + 1).ToString();
System.Drawing.Imaging. ImageFormat imgformat = null ;
if (fileExtName != "" )
{
switch (fileExtName)
{
case "jpg" :
imgformat = System.Drawing.Imaging. ImageFormat.Jpeg;
break;
case "bmp" :
imgformat = System.Drawing.Imaging. ImageFormat.Bmp;
break;
case "gif" :
imgformat = System.Drawing.Imaging. ImageFormat.Gif;
break;
case "png" :
imgformat = System.Drawing.Imaging. ImageFormat.Png;
break;
default:
MessageBox.Show("只能存取为: jpg,bmp,gif,png 格式" );
isSave = false;
break;
}
}
//默认保存为JPG格式
if (imgformat == null )
{
imgformat = System.Drawing.Imaging. ImageFormat.Jpeg;
}
if (isSave)
{
try
{
bitmap.Save(fileName, imgformat);
MessageBox.Show("图片已经成功保存!" );
}
catch
{
MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!" );
}
}
}
}
}
[ DllImport("user32.dll" , CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
[ DllImport("user32.dll" , CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(HandleRef hWnd, int msg, IntPtr wParam, IntPtr lParam);
[ DllImport("gdi32.dll" , CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true )]
public static extern bool BitBlt(HandleRef hDC, int x, int y, int nWidth, int nHeight, HandleRef hSrcDC, int xSrc, int ySrc, int dwRop);
/// <summary>
/// 支持呈现到指定的位图。
/// </summary>
public static Bitmap DrawToBitmap( Control control, Bitmap bitmap, Rectangle targetBounds)
{
if (bitmap == null )
{
throw new ArgumentNullException( "bitmap");
}
if (((targetBounds.Width <= 0) || (targetBounds.Height <= 0)) || ((targetBounds.X < 0) || (targetBounds.Y < 0)))
{
throw new ArgumentException( "targetBounds");
}
Bitmap image = new Bitmap(control.Width, control.Height, bitmap.PixelFormat);
using (Graphics graphics = Graphics.FromImage(image))
{
IntPtr hdc = graphics.GetHdc();
SendMessage( new HandleRef (control, control.Handle), 0x317, hdc, (IntPtr)30);
using (Graphics graphics2 = Graphics.FromImage(bitmap))
{
IntPtr handle = graphics2.GetHdc();
BitBlt( new HandleRef (graphics2, handle), 0, 0, control.Width, control.Height, new HandleRef(graphics, hdc), targetBounds.X, targetBounds.Y,
0xcc0020);
graphics2.ReleaseHdcInternal(handle);
}
graphics.ReleaseHdcInternal(hdc);
}
return image;
}
