如何使用Bitbit绘制透明位图？

问题描述

大家好我在C＃中用这个代码在控件上绘制位图，不幸的是，Drawed背景颜色是灰色但我的Bitmap是透明的。你能帮我吗？

hi everyone i used this code in C# for draw bitmap on Control,Unfortunately, the Drawed background color is gray But my Bitmap is Transparent.Can you help me please?

try
                {
                    hdcDest = grpDest.GetHdc();
                    hdcSrc = grpSrc.GetHdc();
                    hBitmap = bmp.GetHbitmap();

                    hOldObject = SelectObject(hdcSrc, hBitmap);
                    if (hOldObject == IntPtr.Zero)
                        throw new Win32Exception();

                    if (!BitBlt(hdcDest, 0, 0, Width, Height,
                        hdcSrc, 0, 0,SRCCOPY))
                        throw new Win32Exception();
                }
                finally
                {
                    if (hOldObject != IntPtr.Zero) SelectObject(hdcSrc, hOldObject);
                    if (hBitmap != IntPtr.Zero) DeleteObject(hBitmap);
                    if (hdcDest != IntPtr.Zero) ReleaseHdc(hdcDest);
                    if (hdcSrc != IntPtr.Zero) ReleaseHdc(hdcSrc);
                }

推荐答案

[System.Runtime.InteropServices.DllImportAttribute ("msimg32.dll")]
       public  static extern bool TransparentBlt (IntPtr hdc, int nXOriginDest, int nYOriginDest, int nWidthDest, int hHeightDest, IntPtr hdcSrc, int nXOriginSrc,  int nYOriginSrc, int nWidthSrc, int nHeightSrc, uint crTransparent);

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