CEdit and the font that it uses.

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Hi,

I am trying to determine at run time how many characters I can fit on a line in a multi-line CEdit control.
Here is the code:

BOOL CSegmentsPage::OnInitDialog( void )
{
    CPropertyPage::OnInitDialog();
    BOOL bRet = m_font.CreatePointFont( 100, _T("Courier New") );
    
    m_editSegments.SetFont( &m_font );
    // calculate the number of characters per line.
    CRect r;
    CDC* pDC = m_editSegments.GetDC();
    
    CFont* pFont = pDC->GetCurrentFont();
    LOGFONT logFont;
    pFont->GetLogFont( &logFont );
    //logFont.lfFaceName == _T("System")

    m_editSegments.GetClientRect( &r );
    CSize sizeChar = pDC->GetTextExtent( CString(_T("1")) );
    m_nCharsPerLine = r.Width() / sizeChar.cx;

...

The problem is that the font the CDC is using is not the same as the font i set on the CEdit control(Courier New), it is using "System" font instead. Does anyone know how to fix this?

Thanks - John

Posted 10-Feb-11 23:29pm

__John_

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__John_ · Answer 1 · 2011-02-11T01:17:00

Solution 2

Thats great, worked just fine.

Thanks Nuri!

Posted 11-Feb-11 1:17am

__John_

Nuri Ismail · Answer 2 · 2011-02-10T23:52:00

I would use CClientDC[^] instead of calling GetDC() from edit control.
Also try to manually select the created font in your client DC like this:

C++

// Here you create the font and call SetFont for your edit control...
//...
// Now create a client DC for the edit control and select the created font
CClientDC dc(&m_editSegments);
CFont* pOldFont = dc.SelectObject(&m_font);
CSize size = dc.GetTextExtent("....");
dc.SelectObject(pOldFont);

I've used something similar before and it worked for me.

NOTE: In case you need the average char width of the selected font you could use:

C++

// Get text metrics
TEXTMETRIC txtMetric;
memset(&txtMetric, 0, sizeof(txtMetric));
dc.GetTextMetrics(&txtMetric);
// Now "txtMetric.tmAveCharWidth" contains the average char width

I hope this helps :)