C# 根据控件或者操作句柄进行截图备忘

最新推荐文章于 2024-10-28 09:43:40 发布

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这个博客介绍了如何利用API32函数在Windows环境下，通过窗体句柄实现对控件或窗体的截图。提供了两种方法，一种是针对设计器画在Pan上的控件，另一种是直接通过Win32 API获取并绘制窗口内容。涉及到的关键函数包括GetWindowDC, CreateCompatibleBitmap, PrintWindow等。

#region 使用api32 根据窗体句柄进行截图

        /// <summary>
        /// 此方法仅仅适用于设计器画在pan上的
        /// </summary>
        /// <param name="cot"></param>
        /// <returns></returns>
        public Bitmap CutControlBitmap(Control cot)
        {
            Bitmap bmp = new Bitmap(cot.Width, cot.Height);
            cot.DrawToBitmap(bmp, cot.ClientRectangle);
            return bmp;
        }



        public Bitmap CutControlBitmap(IntPtr winCotPtr)
        {
            //1先获取控件的大小
            IntPtr hscrdc = GetWindowDC(winCotPtr);
            RECT rECT = new RECT();
            GetWindowRect(winCotPtr, ref rECT);
            IntPtr mapPtr = CreateCompatibleBitmap(hscrdc, rECT.Right - rECT.Left, rECT.Bottom - rECT.Top);
            IntPtr hmemdc = CreateCompatibleDC(hscrdc);
            SelectObject(hmemdc, mapPtr);
            PrintWindow(winCotPtr, hmemdc, 0);
            Bitmap bmp=Bitmap.FromHbitmap(mapPtr);
            DeleteObject(mapPtr);
            DeleteDC(hscrdc);
            DeleteDC(hmemdc);
            return bmp;
        }

        [DllImport("user32.dll")]
        public static extern IntPtr GetWindowDC(IntPtr hwnd);

        [DllImport("user32.dll")]
        public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);

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

        [DllImport("gdi32.dll")]
        public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

        [DllImport("gdi32.dll")]
        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

        [DllImport("user32.dll")]
        public static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags);

        [DllImport("gdi32.dll")]
        public static extern IntPtr DeleteObject(IntPtr hgdiobj);

        [DllImport("gdi32.dll")]
        public static extern int DeleteDC(IntPtr hdc);
        public struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        #endregion