LPtoDP function is not working 1

[nohairleft]

I am running Visual C++ 6.0 MFC Document/View. MyCView class's OnDraw(pDC) function calls a myCDocument function pDoc->DisplayMyStuff(pDC) which defines a CRect called WaferRect and calls a function called DisplayMapSetup(pDC, WaferRect). The code snippet is shown below.

void CWaferMapDoc:isplayMapSetup(CDC* pDC, CRect WaferRect)
{
pDC->LPtoDP(&WaferRect);

int height = WaferRect.Height();

I have also tried this as pDC->LPtoDP(WaferRect) and with various mapping modes, but all I ever get are the logical units when I want the pixels. It's as though the LPtoDP() function is just a NULL function. Can anyone see what I am missing to get the LPtoDP() function to work properly and convert my units from logical to pixals.

 

[HyperEngineer]

Did you set your map mode?

For example:

  pDC->SetMapMode(MM_LOENGLISH);
  // Then do the conversion
  pDC->LPtoDP(WaferRect);

I believe LptoDP() takes a RECT argument and not a RECT*.

HyperEngineer
If it ain't broke, it probably needs improvement.