MFC Printing with CDC just works on some Printers

问题

I'm implementing a Printing Function in a big Project to print so called gadgets (derived from CWnd). In the Gadget Class I've created a Function to Render it to the Device Context

PrintPageContent(CDC * pDC, const CRect & rContent, int page, int numPages) 
{
    PrintWindow(pDC, PW_CLIENTONLY);
    pDC->Rectangle(rContent.left,rContent.top, rContent.right, rContent.bottom);
}

To Render the Gadget easily I thought about using the PrintWindow Function https://msdn.microsoft.com/en-us/library/x51z0shh.aspx

What is always working?

Everything in the PrintPreview
The Border Rectangle when I'm Actually Printing

What isnt Working?

the Gadget isnt printed in some cases of the "actual Printing Process" / "Printing to Paper".

So I tried to print via PDF Creator and via 3 Local Printers in my LAN on 2 Different Windows Machines (Win7, Win8) with different Results (they seem to be always the same so i don't think its some kind of uninitialized member). Whats very weird is that I have different Results on the Machines for example there is one Printer which works for PC A but not for PC B.

I can tell you that printing just wont work within my Application so it isn't a Driver Problem. Printing normal Documents, Images fully works. And as I already told the Border is always printed.

What could be the cause of this? Do you know any Cases of such kind of Problem?

Hint: As an workaround I tried to Copy the Gadget from the CPaintDC of the UI directly via BitBlt. In this case I have the Same Problem

To find the Issue I created a Small Test Project to recreate the Situation. Here Is the Source Code

//Create Members
CDC pDC;
HDC hdc;

//Get Printer/Printer Settings
LPCSTR buffer = NULL;
GetDefaultPrinterName(buffer);
hdc = CreateDC("WINSPOOL", buffer, NULL, NULL);
pDC.Attach(hdc);
pDC.m_bPrinting = TRUE;

//Start Document Printing
pDC.StartDoc("TEST");
pDC.StartPage();

//Render Window
PrintWindow(&pDC,PW_CLIENTONLY);

//Render Frame Rectangle
CRect WindowRect;
GetClientRect(WindowRect);
WindowRect.MoveToXY(0,0);
CBrush brush;
brush.CreateSolidBrush(RGB(0,0,0));
pDC.FrameRect(WindowRect,  &brush);

// Finish Printing
pDC.EndPage();
pDC.EndDoc();

I'm facing the same Problems here. The Same Printers are working for the same PC's. I think the only Problem could be the Line where I create the HDC

hdcBuffer = CreateDC("WINSPOOL", buffer, NULL, NULL);

I think this call in Connection with the "printWindow" or "bitblt" is the problem.

Or could this be a MFC bug?

回答1:

It looks like a MFC Bug. Somehow the Printer Driver isn't initialized Correctly. I tried several Solution's but wasn't able to got this working. It really fails in the most Simple Examples with different Results on Differnt Machines.

来源：https://stackoverflow.com/questions/30996167/mfc-printing-with-cdc-just-works-on-some-printers

标签

c++

visual-c++

printing

mfc

cdc