C# winform抓屏的问题？

Question

能不能抓屏幕的x是从屏幕的最上面开始呢？我在网上找的都是从工作区开始的，如何解决这个问题？

Answer 1

System.Windows.Forms.Control的MousePosition，通过这个属性可以得到鼠标相对于屏幕的位置

Answer 2

贴个GDI的:
---------------------------------------------
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;class sc:Form
{
    [DllImport("user32.dll", EntryPoint="GetDesktopWindow")]
    public static extern IntPtr GetDesktopWindow ();
    [DllImport("user32.dll", EntryPoint="GetWindowDC")]
    public static extern IntPtr GetWindowDC (IntPtr hwnd);
    [DllImport("gdi32.dll", EntryPoint="BitBlt")]
    public static extern int BitBlt (IntPtr hDestDC,int x,int y,int nWidth,int nHeight,IntPtr hSrcDC,int xSrc,int ySrc,int dwRop);
    [DllImport("gdi32.dll", EntryPoint="CreateCompatibleBitmap")]
    public static extern IntPtr CreateCompatibleBitmap (IntPtr hdc,int nWidth,int nHeight);
    [DllImport("gdi32.dll", EntryPoint="CreateCompatibleDC")]
    public static extern IntPtr CreateCompatibleDC (IntPtr hdc);
    [DllImport("user32.dll", EntryPoint="ReleaseDC")]
    public static extern int ReleaseDC (IntPtr hwnd,IntPtr hdc);
    [DllImport("gdi32.dll", EntryPoint="SelectObject")]
    public static extern IntPtr SelectObject (IntPtr hdc,IntPtr hObject);
    [DllImport("gdi32.dll", EntryPoint="DeleteDC")]
    public static extern int DeleteDC (IntPtr hdc);
    [DllImport("gdi32.dll", EntryPoint="DeleteObject")]
    public static extern int DeleteObject (IntPtr hObject);
    public const int SRCCOPY = 0xCC0020;
    Image getscr()
    {
        int w = Screen.PrimaryScreen.Bounds.Right;
        int h = Screen.PrimaryScreen.Bounds.Bottom;
        IntPtr scrwnd = GetDesktopWindow();
        IntPtr hdcscr = GetWindowDC(scrwnd);
        IntPtr hdcmem = CreateCompatibleDC(hdcscr);
        IntPtr bmpmem = CreateCompatibleBitmap(hdcscr,w,h);//GDI内存图像
        bmpmem = SelectObject(hdcmem,bmpmem);//把bmpmem弄进去
        BitBlt (hdcmem,0,0,w,h,hdcscr,0,0,SRCCOPY);//拷贝DC
        bmpmem = SelectObject(hdcmem,bmpmem);//把bmpmem弄出来
        DeleteDC (hdcmem);ReleaseDC (scrwnd,hdcscr);//处理后事
        Image bmp = Image.FromHbitmap(bmpmem);
        DeleteObject (bmpmem);//处理后事
        return bmp;
    }
    public sc()
    {
        BackgroundImage = getscr();
    }
    static void Main()
    {
        Application.Run (new sc());
    }
}
------------------------------------------------
有兴趣的话把它再改改~

Answer 3

[ System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]
private static extern bool BitBlt (
IntPtr hdcDest , // 目标 DC的句柄
int nXDest , 
int nYDest , 
int nWidth , 
int nHeight , 
IntPtr hdcSrc ,  // 源DC的句柄
int nXSrc , 
int nYSrc , 
System.Int32 dwRop  // 光栅的处理数值
) ; private void button1_Click(object sender, System.EventArgs e)
{
//获得当前屏幕的大小
Rectangle rect = new Rectangle ( ) ;
rect = Screen.GetWorkingArea (this) ;
//创建一个以当前屏幕为模板的图象
Graphics g1 = this.CreateGraphics ( ) ;
//创建以屏幕大小为标准的位图，g1提供分辨率
Image MyImage = new Bitmap ( rect.Width , rect.Height , g1 ) ;
Graphics g2 = Graphics.FromImage ( MyImage ) ;
//得到屏幕的DC
IntPtr dc1 = g1.GetHdc ( ) ;
//得到Bitmap的DC 
IntPtr dc2 = g2.GetHdc ( ) ;
//左上角为坐标。所以调整截图基准位置
int baseX=-this.PointToScreen(new Point(0,0)).X;
int baseY=-this.PointToScreen(new Point(0,0)).Y;
//调用此API函数，实现屏幕捕获
BitBlt ( dc2 , 0 , 0 , rect.Width , rect.Height , dc1 , baseX ,baseY , 6684688 ) ;
//释放掉屏幕的DC
g1.ReleaseHdc ( dc1 ) ;
//释放掉Bitmap的DC 
g2.ReleaseHdc ( dc2 ) ;
//以JPG文件格式来保存
MyImage.Save ( "c:\\Capture.jpg" , System.Drawing.Imaging.ImageFormat.Jpeg );
MessageBox.Show ( "当前屏幕已经保存为c:\\capture.jpg" ) ; }

Answer 4

int baseX=-this.PointToScreen(new Point(0,0)).X;
int baseY=-this.PointToScreen(new Point(0,0)).Y;
good!