Very weird change font problem

[econy]

A dialog based program, I put a function to draw a string on the screen. the function is member function of TestDlg.h; But if I put the function in TestDlg.cpp, the screen show some weird messy characters. Then I put the same function in another cpp file, most of this file are global functions. JTest.cpp, with Jtest.h. Weird thing is it works, screen can show correct characters. Situation like:

TestDlg.cpp
IMPLEMENT_DYNAMIC (CTestDlg,CDialog)
...
void TestDlg::DrawInfoLabel(void)
{
CDC* pDC;
CRect rect(562,448,688,467);
CString lebelStr;

HDC hDC;					
LOGFONT lf;		
HFONT FontNew, FontOld;		

pDC = GetDC();
hDC = pDC->GetSafeHdc();

memset(&lf, 0, sizeof(LOGFONT));	
lf.lfHeight = -14 \* GetDeviceCaps(hDC,LOGPIXELSY)/72;
lf.lfWeight = 0;
//WCHAR lffn\[\] = TEXT("SimSun(TrueType)"); 
WCHAR lffn\[\] = TEXT("FZYaoTi(OpenType)"); 
wcscpy(lf.lfFaceName,lffn);
lf.lfCharSet = GB2312\_CHARSET;
FontNew = CreateFontIndirect(&lf);
FontOld = (HFONT)SelectObject(hDC,FontNew);

pDC->SetTextColor(RGB(0xFF,0x00,0x00));
SetBkMode(hDC,TRANSPARENT);

DrawText(hDC,\_T("??"),-1,rect,DT\_CENTER|DT\_VCENTER|DT\_SINGLELINE);

SelectObject(hDC,FontOld);
DeleteObject(FontNew);
ReleaseDC(pDC);

}

In JTest.cpp

void TestDlg::DrawInfoLabel(void)
{
....
}

Every line is same, only difference is file name. I feel it is the following statement affect the screen output. IMPLEMENT_DYNAMIC (CTestDlg,CDialog)

// Microsoft Visual C++ generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"
#include "newres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE
BEGIN
"resource.h\0"
END

2 TEXTINCLUDE
BEGIN
"#include ""afxres.h""\r\n"
"#include ""newres.h""\r\n"
"\0"
END
........

The above is .rc file. Hope someone can explain t

[Lost User]

Hi, This sounds like it might be related to code inline expansion. Where are you calling the function DrawInfoLabel()? Are you calling this from the WM_PAINT handler? Best Wishes, -David Delaune

[econy]

I　call that function just in a general member function.

CTestDlg
{
public:
void refreshInfoLabel(void);

}

void CTestDlg::refreshInfoLabel(void)
{
DrawInfoLabel()
}

[Lost User]

Hi, It is generally not recommended to draw outside of the WM_PAINT/WM_ERASEBKGND handlers. When you draw outside of WM_PAINT you need to invalidate the window rectangle/region so that the subsystem knows to redraw it. InvalidateRect function[^] InvalidateRgn function[^] Best Wishes, -David Delaune

[econy]

I wonder if WM_PAINT message handler could display messages immediately. or even I draw it in a member function, it would refresh in OnPaint() executed?

[Lost User]

econy wrote:

I wonder if WM_PAINT message handler could display messages immediately. or even I draw it in a member function, it would refresh in OnPaint() executed?

No. There is no guarantee that when your WM_PAINT message fires that the subsystem will redraw window contents unless the rectangle/region/window is marked invalid. This is an OS optimization to prevent excessive redrawing. (However with DWM enabled[^] the rules do change a bit) Read all of this so that in the future you can help others: Painting and Drawing[^] Best Wishes, -David Delaune

[econy]

Thanks