bool guess=PDC - & gt; TransparentBlt (
0, 0 
, m_ClientRect. Width () 
, m_ClientRect. Height () 
, & amp; M_gridDC 
, 0, 0 
, m_ClientRect. Width () 
, m_ClientRect. Height () 
, RGB (255, 255, 255)); 
DWORD x=GetLastError ();//reflection for parameter error 

Operation result error code of 87, said parameter errors, but I don't know is which parameter error?

CodePudding user response:

Code of PDC is equipment DC pointer, m_gridDC is a memory DC, rectangular m_ClientRect is equipment

CodePudding user response:

 BOOL TransparentBlt (
Int xDest, 
Int yDest, 
Int nDestWidth, 
Int nDestHeight, 
The CDC * pSrcDC, 
Int xSrc, 
Int ySrc, 
Int nSrcWidth, 
Int nSrcHeight, 
UINT clrTransparent); 

DC parameters are interpreted as in the MSDN: equipment in the rectangular coordinates, equipment DC rectangle width, memory DC Pointers, memory DC rectangular coordinates, the memory DC rectangular aspect, needs to be transparent RGB

CodePudding user response:

By the way, in the m_gridDC common BMP bitmap is not, but there is a custom mapping mode of the bitmap

CodePudding user response:

Equipment DC should agree with m_gridDC mapping mode,

CodePudding user response:

reference 4 floor schlafenhamster response:

equipment DC should agree with m_gridDC mapping mode,

Thank you for your reply, I try again,

CodePudding user response:

reference 4 floor schlafenhamster response:

equipment DC should agree with m_gridDC mapping mode,

Hello, still can't show, but it is ok to use BitBlt shows that not only transparent, still can not reach the purpose,