Using the new default VS2017 MFC project, try to output text in ontouch function, line drawing, nowhere else changes, compiles without error, but the runtime View area is blank, please answer

CodePudding user response:

 
Void CSDI3View: : ontouch * pDC (CDC) 
{
CSDI3Doc * pDoc=GetDocument (); 
ASSERT_VALID (pDoc); 
//TODO: add the draw code for native data here 

//save DC 
Int nSaveDC=pDC - & gt; SaveDC (); 

//the client area coordinates range 
CRect rcClient; 
GetClientRect (& amp; RcClient); 

//fill background 
PDC - & gt; FillSolidRect (rcClient, RGB (250, 250, 250)); 

Draw a line//
{
//create the brush 
CPen linePen (PS_SOLID, 2, RGB (255, 0, 0)); 
//candidate brush 
CPen * pOldPen=pDC - & gt; SelectObject (& amp; LinePen); 
//move to the starting point for 
PDC - & gt; MoveTo (rcClient TopLeft ()); 
Draw a line//
PDC - & gt; LineTo (rcClient BottomRight ()); 
//restore brush 
PDC - & gt; SelectObject (pOldPen); 
} 

//write 
{
//create a font 
CFont mFont; 
MFont. CreatePointFont (240, _T (" Arial ")); 
//candidate font 
CFont * pOldFont=pDC - & gt; SelectObject (& amp; MFont); 

//set the font color 
Int txColor=pDC - & gt; SetTextColor (RGB (0, 0, 255)); 

//set the background transparent 
Int bkMode=pDC - & gt; SetBkMode (TRANSPARENT); 

//output font 
PDC - & gt; TextOut (10, 10, _T (" font ")); 

//recovery background model 
PDC - & gt; SetBkMode (bkMode); 
//resume font color 
PDC - & gt; SetTextColor (txColor); 
//resume font 
PDC - & gt; SelectObject (pOldFont); 
} 

//restore DC 
PDC - & gt; RestoreDC (nSaveDC); 

} 

CodePudding user response:

Finished drawing up refreshed

CodePudding user response:

RestoreDC is restored, removed

CodePudding user response:

refer to the original poster Wilbot response:

using the new default VS2017 MFC project, try to output text in ontouch function, line drawing, nowhere else changes, compiled without error, but the runtime View area is blank, please answer

Ontouch code post