镇江网站建设推广找思创,seo流量是什么,公司的网址格式,软件安卓下载介绍#xff1a; 做项目中#xff0c;遇到需要截取界面图形的内容#xff0c;查找了所有的Graphics函数#xff0c; 都没有此功能。只能用GDI32中的BitBlt来解决。应用需要调用的函数 class GDI32 { [DllImport(GDI32.dll)] public static extern bool BitB…介绍 做项目中遇到需要截取界面图形的内容查找了所有的Graphics函数 都没有此功能。只能用GDI32中的BitBlt来解决。应用需要调用的函数 class GDI32 { [DllImport(GDI32.dll)] public static extern bool BitBlt(int hdcDest,int nXDest,int nYDest, int nWidth,int nHeight,int hdcSrc, int nXSrc,int nYSrc,int dwRop); [DllImport(GDI32.dll)] public static extern int CreateCompatibleBitmap(int hdc,int nWidth, int nHeight); [DllImport(GDI32.dll)] public static extern int CreateCompatibleDC(int hdc); [DllImport(GDI32.dll)] public static extern bool DeleteDC(int hdc); [DllImport(GDI32.dll)] public static extern bool DeleteObject(int hObject); [DllImport(GDI32.dll)] public static extern int GetDeviceCaps(int hdc,int nIndex); [DllImport(GDI32.dll)] public static extern int SelectObject(int hdc,int hgdiobj); public static void Cleanup(int hBitmap,int hdcSrc,int hdcDest) { // Release the device context resources back to the system User32.ReleaseDC(User32.GetDesktopWindow(),hdcSrc); GDI32.DeleteDC(hdcDest); GDI32.DeleteObject(hBitmap); } public static void SaveImageAs(int hBitmap,string fileName,ImageFormat imageFormat) { // Create a bitmap from the Windows handle Bitmap image new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)), Image.FromHbitmap(new IntPtr(hBitmap)).Width, Image.FromHbitmap(new IntPtr(hBitmap)).Height); image.Save(fileName,imageFormat); } } class User32 { [DllImport(User32.dll)] public static extern int GetDesktopWindow(); [DllImport(User32.dll)] public static extern int GetWindowDC(int hWnd); [DllImport(User32.dll)] public static extern int ReleaseDC(int hWnd,int hDC); }具体实现的方式 和C中的代码类似 int hdcSrc User32.GetWindowDC((int)this.control.Handle), // 获得控件的Handle hdcDest GDI32.CreateCompatibleDC(hdcSrc), // 创建兼容DC hBitmap GDI32.CreateCompatibleBitmap(hdcSrc, this.control.Width,this.control.Height);//创建 GDI32.SelectObject(hdcDest,hBitmap); // 选择 GDI32.BitBlt(hdcDest,0,0,this.control.Width, this.control.Height, hdcSrc,0,0,0x00CC0020);//绘制图形 Bitmap image new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)), Image.FromHbitmap(new IntPtr(hBitmap)).Width, Image.FromHbitmap(new IntPtr(hBitmap)).Height);//转换为.net的Image类型 GDI32.Cleanup(hBitmap,hdcSrc,hdcDest);//清除句柄转载于:https://www.cnblogs.com/wanghualiang/archive/2006/01/20/320709.html
