为所有子窗口设置同种字体

一、在App头文件中加入：
BOOL __stdcall SetChildFont(HWND hwnd, LPARAM lparam);

class TApplicationFont : public CObject {
private:
CString m_strFaceName;
int m_nFontSize;
int m_nPointSize;
CFont m_Font;

private:
void createFont(void);

public:
TApplicationFont(LPCTSTR szFaceName);
virtual ~TApplicationFont();

CFont *GetFont(void);
CString& GetFaceName(void);
int GetFontSize(void);
int GetPointSize(void);

void SetFaceName(LPCTSTR szFaceName);
};

二、在实现App的.cpp中加入：
//
// Global font
//
TApplicationFont g_Font(_T("楷体_GB2312"));

//
// Callback functions for EnumChildWindows
//

// lParam is a pointer to CFont object
BOOL __stdcall SetChildFont(HWND hwnd, LPARAM lparam)
{
CFont *pFont = (CFont*)lparam;
CWnd *pWnd = CWnd::FromHandle(hwnd);
pWnd->SetFont(pFont);
return TRUE;
}

//=============================================================================
// TApplicationFont
//

TApplicationFont::TApplicationFont(LPCTSTR szFaceName)
{
m_strFaceName = szFaceName;
createFont();
}

TApplicationFont::~TApplicationFont()
{
}

void TApplicationFont::createFont(void)
{
NONCLIENTMETRICS metrics;
metrics.cbSize = sizeof(metrics);
::SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &metrics, 0);

CWindowDC wdc(NULL);
int nLPixY = GetDeviceCaps(wdc.m_hDC, LOGPIXELSY);

m_nFontSize = metrics.lfStatusFont.lfHeight;
//如果要改变字大小则可m_nFontSize = metrics.lfStatusFont.lfHeight = 36;
m_nPointSize = -MulDiv(m_nFontSize,72,nLPixY);
_tcscpy(metrics.lfStatusFont.lfFaceName, m_strFaceName);
m_Font.CreateFontIndirect(&metrics.lfStatusFont);
}

CFont *TApplicationFont::GetFont(void)
{
return &m_Font;
}

CString& TApplicationFont::GetFaceName(void)
{
return m_strFaceName;
}

int TApplicationFont::GetFontSize(void)
{
return m_nFontSize;
}

int TApplicationFont::GetPointSize(void)
{
return m_nPointSize;
}

void TApplicationFont::SetFaceName(LPCTSTR szFaceName)
{
m_strFaceName = szFaceName;
m_Font.DeleteObject();
createFont();
}

三、在OnCreate或者OnInitDialog中加入：
extern TApplicationFont g_Font;
// g_Font is an object of type CFont or derived from CFont
EnumChildWindows(m_hWnd, ::SetChildFont, &g_Font);