使用BitBlt是一个相当标准的屏幕捕获功能,可以在网上找到:
主要功能:
while(true)
{
printscreen = GetDesktopImage(X, Y, secMonitorSize.Width, secMonitorSize.Height);
Thread.Sleep(1000);
}
捕获桌面功能:
public Bitmap GetDesktopImage(int X, int Y, int width, int height)
{
IntPtr hDC = WIN32_API.GetDC(WIN32_API.GetDesktopWindow());
IntPtr hMemDC = WIN32_API.CreateCompatibleDC(hDC);
IntPtr m_HBitmap = WIN32_API.CreateCompatibleBitmap(hDC, width, height);
if (m_HBitmap != IntPtr.Zero)
{
IntPtr hOld = (IntPtr)WIN32_API.SelectObject(hMemDC, m_HBitmap);
WIN32_API.BitBlt(hMemDC, 0, 0, width, height, hDC, X, Y, WIN32_API.SRCCOPY | WIN32_API.CAPTURE_BLT);
WIN32_API.SelectObject(hMemDC, hOld);
WIN32_API.DeleteDC(hMemDC);
WIN32_API.ReleaseDC(WIN32_API.GetDesktopWindow(), hDC);
Bitmap printscreen = System.Drawing.Image.FromHbitmap(m_HBitmap);
WIN32_API.DeleteObject(m_HBitmap);
return printscreen;
}
return null;
}
问题是代码运行大约20分钟,然后CreateCompatibleBitmap将继续返回0.在CreateCompatibleBitmap上使用setlasterror = true,它显示错误代码997(重叠的I / O操作正在进行中)。
只有赛门铁克在后台运行。任何人都知道如何开始排除故障?
答案 0 :(得分:3)
GDI函数不使用GetLastError()
,因此使用setlasterror=true
会报告早期API调用中的错误。
试试这个:
public Bitmap GetDesktopImage(int X, int Y, int width, int height)
{
Bitmap printscreen = null;
IntPtr hWnd = WIN32_API.GetDesktopWindow();
IntPtr hDC = WIN32_API.GetDC(hWnd);
if (hDC != IntPtr.Zero)
{
IntPtr hMemDC = WIN32_API.CreateCompatibleDC(hDC);
if (hMemDC != IntPtr.Zero)
{
IntPtr m_HBitmap = WIN32_API.CreateCompatibleBitmap(hDC, width, height);
if (m_HBitmap != IntPtr.Zero)
{
IntPtr hOld = (IntPtr)WIN32_API.SelectObject(hMemDC, m_HBitmap);
WIN32_API.BitBlt(hMemDC, 0, 0, width, height, hDC, X, Y, WIN32_API.SRCCOPY | WIN32_API.CAPTURE_BLT);
WIN32_API.SelectObject(hMemDC, hOld);
printscreen = System.Drawing.Image.FromHbitmap(m_HBitmap);
WIN32_API.DeleteObject(m_HBitmap);
}
WIN32_API.DeleteDC(hMemDC);
}
WIN32_API.ReleaseDC(hWnd, hDC);
}
return printscreen;
}