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bool guess = pdc->TransparentBlt(
0,0
,m_ClientRect.Width()
,m_ClientRect.Height()
, &m_gridDC
,0,0
, m_ClientRect.Width()
, m_ClientRect.Height()
, RGB(255, 255, 255));
DWORD x = GetLastError();//反映为参数错误
BOOL TransparentBlt(
int xDest,
int yDest,
int nDestWidth,
int nDestHeight,
CDC* pSrcDC,
int xSrc,
int ySrc,
int nSrcWidth,
int nSrcHeight,
UINT clrTransparent);