CEdit and the font that it uses.

Question

0.00/5 (No votes)

See more:

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_

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nuri Ismail · Answer 1 · 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 :)

__John_ · Answer 2 · 2011-02-11T01:17:00

Solution 2

Thats great, worked just fine.

Thanks Nuri!

Posted 11-Feb-11 1:17am