[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")] private static extern bool BitBlt( IntPtr hdcDest, // handle to destination DC int nXDest, // x-coord of destination upper-left corner int nYDest, // y-coord of destination upper-left corner int nWidth, // width of destination rectangle int nHeight, // height of destination rectangle IntPtr hdcSrc, // handle to source DC int nXSrc, // x-coordinate of source upper-left corner int nYSrc, // y-coordinate of source upper-left corner System.Int32 dwRop // raster operation code );
非常感谢您的回帖,软件也通过了编译,但生成的2.jpg是空的。 代码如下,请您再帮我看看。 [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")] private static extern bool BitBlt( IntPtr hdcDest, // handle to destination DC int nXDest, // x-coord of destination upper-left corner int nYDest, // y-coord of destination upper-left corner int nWidth, // width of destination rectangle int nHeight, // height of destination rectangle IntPtr hdcSrc, // handle to source DC int nXSrc, // x-coordinate of source upper-left corner int nYSrc, // y-coordinate of source upper-left corner System.Int32 dwRop // raster operation code ); private void PrintToFile(string name, PrintPageEventArgs e) { Bitmap bm1 = new Bitmap("c:\\1.jpg"); Graphics g1 = Graphics.FromImage(bm1); //这仅是测试,实为 g1 = e.Graphics; 两者生成的2.jpg都是空的。 IntPtr dc1 = g1.GetHdc();
private static extern bool BitBlt(
IntPtr hdcDest, // handle to destination DC
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
IntPtr hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
);
代码如下,请您再帮我看看。
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // handle to destination DC
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
IntPtr hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
); private void PrintToFile(string name, PrintPageEventArgs e)
{
Bitmap bm1 = new Bitmap("c:\\1.jpg");
Graphics g1 = Graphics.FromImage(bm1); //这仅是测试,实为 g1 = e.Graphics; 两者生成的2.jpg都是空的。
IntPtr dc1 = g1.GetHdc();
Bitmap bm2 = new Bitmap(810, 1150);
Graphics g2 = Graphics.FromImage(bm2);
IntPtr dc2 = g2.GetHdc();
bool ll = false;
ll=BitBlt(dc2, 0, 0, 810, 1150, dc1, 0, 0, 13369376); // ll=true;
g1.ReleaseHdc(dc1);
g2.ReleaseHdc(dc2); bm2.Save("c:\\2.jpg", System.Drawing.Imaging.ImageFormat.Jpeg); bm1.Dispose();
bm2.Dispose();
}
Graphics g1 = this.CreateGraphics();
Image MyImage = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height, g1);
Graphics g2 = Graphics.FromImage(MyImage);
IntPtr dc1 = g1.GetHdc();
IntPtr dc2 = g2.GetHdc();
BitBlt(dc2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, dc1, 0, 0, 13369376);
g1.ReleaseHdc(dc1);
g2.ReleaseHdc(dc2);
MyImage.Save(@"e:\1.bmp", ImageFormat.Bmp);
确实是保存了this窗口的内容,但打印预览的内容无法保存。
非常想在“打印预览”按钮上,把打印的内容保存为BMP,有招吗?
想用Graphics g1 = e.Graphics;代替您的Graphics g1 = this.CreateGraphics();
但结果e:\1.bmp是空白,为什么呢?在e.Graphics中画图像都可以,就是考不到Image中。