[C#] capture pic Sample


using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.IO;

namespace capture
{
/// <summary>
/// capturepic 的摘要描述。
/// </summary>
public class capturepic
{
public capturepic()
{
//
// TODO: 在此加入建構函式的程式碼
//
}

[DllImport("gdi32.dll")]
private static extern IntPtr CreateDC(string lpDriverName, string lpDeviceName, string lpOutput, string lpInitData);

[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleDC(IntPtr hDC);

[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth, int nHeight);

[DllImport("gdi32.dll")]
private static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

[DllImport("gdi32.dll")]
private static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

[DllImport("gdi32.dll")]
public static extern int BitBlt(IntPtr desthDC, int srcX, int srcY, int srcW, int srcH, IntPtr srchDC, int destX, int destY, int op);

[DllImport("gdi32.dll")]
private static extern int DeleteDC(IntPtr hDC);

[DllImport("gdi32.dll")]
private static extern int DeleteObject(IntPtr hObj);

public Bitmap CaptureControl(IntPtr SourceDC,int SourceWidth,int SourceHeight)
{
return Capture(SourceDC,SourceWidth,SourceHeight);
}

public Bitmap CaptureScreen()
{
IntPtr screen=CreateDC("DISPLAY", "", "", "");
int sourceWidth=GetDeviceCaps(screen, 8);
int sourceHeight=GetDeviceCaps(screen, 10);
Capture(screen,sourceWidth,sourceHeight);
Bitmap ret=Capture(screen,sourceWidth,sourceHeight);
DeleteDC(screen);
return ret;
 }

static private Bitmap Capture(IntPtr SourceDC,int SourceWidth,int SourceHeight)
 {
IntPtr destDC;
IntPtr BMP, BMPOld;
destDC = CreateCompatibleDC(SourceDC);
BMP = CreateCompatibleBitmap(SourceDC, SourceWidth, SourceHeight);
BMPOld = SelectObject(destDC, BMP);
BitBlt(destDC, 0, 0, SourceWidth, SourceHeight, SourceDC, 0, 0, 13369376);
BMP = SelectObject(destDC, BMPOld);
DeleteDC(destDC);
Bitmap ret = Image.FromHbitmap(BMP);
DeleteObject(BMP);
return ret;
}

#region 測試用Sample
/// <summary>
/// 測試用Sample
/// </summary>
private void capturepic()
{

capturepic cp=new capturepic();
//Bitmap bitmap=cp.CaptureControl(button1.CreateGraphics().GetHdc(),button1.Width,button1.Height);
Bitmap bitmap=cp.CaptureControl(this.CreateGraphics().GetHdc(),this.Width,this.Height);
//bitmap.Save(@"c:\1.bmp");
bitmap=cp.test();
bitmap.Save(@"c:\full.bmp");
}
#endregion

}

}