C#基於.net CF 2.0實現手機抓屏幕

       我博客的第一篇文章就是.net cf 1.x實現手機屏幕的抓取，大概有190左右的訪問量吧。現在是時候介紹一下.net cf 2.0下如何進行手機屏幕抓取了，.net cf 2.0中microsoft封裝了ImageFormat 類，這就解決了保存圖片的問題，其實在.net cf 1.x實現抓屏也就是解決一個圖像保存問題！抓屏的核心技術並沒有多大區別，都是Invoke windows 的GDI API函數，也都是調用這些函數而已！下面是完整的抓屏代碼：
//CaptureScreen.cs using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; namespace DeviceAnywherePhone { /// <summary> /// This class shall keep all the functionality for capturing /// the desktop. /// </summary> public class CaptureScreen { #region Public Class Functions public static Bitmap GetDesktopImage() { SIZE size; IntPtr hBitmap; IntPtr hDC = PlatformInvokeUSER32.GetDC(PlatformInvokeUSER32.GetDesktopWindow()); IntPtr hMemDC = PlatformInvokeGDI32.CreateCompatibleDC(hDC); size.cx = PlatformInvokeUSER32.GetSystemMetrics(PlatformInvokeUSER32.SM_CXSCREEN); size.cy = PlatformInvokeUSER32.GetSystemMetrics(PlatformInvokeUSER32.SM_CYSCREEN); hBitmap = PlatformInvokeGDI32.CreateCompatibleBitmap(hDC, size.cx, size.cy); if (hBitmap!=IntPtr.Zero) { IntPtr hOld = (IntPtr) PlatformInvokeGDI32.SelectObject(hMemDC, hBitmap); PlatformInvokeGDI32.BitBlt(hMemDC, 0, 0,size.cx,size.cy, hDC, 0, 0, PlatformInvokeGDI32.SRCCOPY); PlatformInvokeGDI32.SelectObject(hMemDC, hOld); PlatformInvokeGDI32.DeleteDC(hMemDC); PlatformInvokeUSER32.ReleaseDC(PlatformInvokeUSER32.GetDesktopWindow(), hDC); Bitmap bmp = System.Drawing.Image.FromHbitmap(hBitmap); PlatformInvokeGDI32.DeleteObject(hBitmap); GC.Collect(); return bmp; } return null; } public static MemoryStream GetDesktopImageToStream(System.Drawing.Imaging.ImageFormat imageFormat) { MemoryStream ms = new MemoryStream(); Bitmap bmp = GetDesktopImage(); if (bmp != null) { bmp.Save(ms, imageFormat); } else { ms = null; } return ms; } public static byte[] GetDesktopImageToBuffer(System.Drawing.Imaging.ImageFormat imageFormat) { byte[] buffer = null; MemoryStream ms = GetDesktopImageToStream(imageFormat); if (ms != null) { //buffer = new byte[ms.Length]; buffer = ms.GetBuffer(); } return buffer; } public static bool GetDesktopImageToFile(string fileName, ImageFormat imageFormat) { Bitmap bmp = GetDesktopImage(); if (bmp != null) { bmp.Save(fileName, imageFormat); return true; } else { return false; } } #endregion } }
PlatFormInvokeGDI32.cs using System; using System.Runtime.InteropServices; namespace DeviceAnywherePhone { /// <summary> /// This class shall keep the GDI32 APIs being used in our program. /// </summary> public class PlatformInvokeGDI32 { #region Class Variables public const int SRCCOPY = 13369376; #endregion #region Class Functions [DllImport("coredll.dll", EntryPoint = "DeleteDC")] public static extern IntPtr DeleteDC(IntPtr hDc); [DllImport("coredll.dll", EntryPoint = "DeleteObject")] public static extern IntPtr DeleteObject(IntPtr hDc); [DllImport("coredll.dll", EntryPoint = "BitBlt")] public static extern bool BitBlt(IntPtr hdcDest,int xDest,int yDest,int wDest,int hDest,IntPtr hdcSource,int xSrc,int ySrc,int RasterOp); [DllImport("coredll.dll", EntryPoint = "CreateCompatibleBitmap")] public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight); [DllImport("coredll.dll", EntryPoint = "CreateCompatibleDC")] public static extern IntPtr CreateCompatibleDC(IntPtr hdc); [DllImport("coredll.dll", EntryPoint = "SelectObject")] public static extern IntPtr SelectObject(IntPtr hdc,IntPtr bmp); #endregion #region Public Constructor public PlatformInvokeGDI32() { // // TODO: Add constructor logic here // } #endregion } }
PlatformInvokeUSER32.cs using System; using System.Runtime.InteropServices; namespace DeviceAnywherePhone { /// <summary> /// This class shall keep the User32 APIs being used in /// our program. /// </summary> public class PlatformInvokeUSER32 { #region Class Variables public const int SM_CXSCREEN=0; public const int SM_CYSCREEN=1; #endregion #region Class Functions [DllImport("coredll.dll", EntryPoint="GetDesktopWindow")] public static extern IntPtr GetDesktopWindow(); [DllImport("coredll.dll", EntryPoint = "GetDC")] public static extern IntPtr GetDC(IntPtr ptr); [DllImport("coredll.dll", EntryPoint = "GetSystemMetrics")] public static extern int GetSystemMetrics(int abc); [DllImport("coredll.dll", EntryPoint = "GetWindowDC")] public static extern IntPtr GetWindowDC(Int32 ptr); [DllImport("coredll.dll", EntryPoint = "ReleaseDC")] public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDc); #endregion #region Public Constructor public PlatformInvokeUSER32() { // // TODO: Add constructor logic here // } #endregion } //This structure shall be used to keep the size of the screen. public struct SIZE { public int cx; public int cy; } }
三個文件，至於如何調用就不用我給出例子了吧，Good Luck！！