Conversion problem

Posted on 1998-11-04
Last Modified: 2010-04-02
Looks like VC++ cannot convert automatically from string to CString as I get some error message.

Cf below for extract of the code as well as the error message.

string CashOrSwap;
CString    m_HkdRunTime;

m_HkdRunTime = CashOrSwap;

C:\TADS\TADS\DPRMYLDHKDdlg.cpp(395) : error C2679: binary '=' : no
operator defined which takes a right-hand operand of type 'class
std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char>>' (or there is no acceptable conversion)

Can anyone tell me how to convert from string to CString?
Question by:decornez
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Accepted Solution

yonat earned 30 total points
ID: 1176923
    m_HkdRunTime = CashOrSwap.c_str();

For the reverse direction:
    CashOrSwap = (LPCTSTR)m_HkdRunTime;

Author Comment

ID: 1176924
It seems to get rid of the error message, but for some reason, my m_HkdRunTime variable which is attached to a dialiog box's edit box does not display anything !

Any idea why ?


Expert Comment

ID: 1176925
Are you updating the display? You need to call UpdateData() after changing the value of m_HkdRunTime. (If you do this in OnInitDialog(), then UpdateData() already gets called by the framework.)

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Author Comment

ID: 1176926
Yes, I do update the data but it does not work.

Anyway I guess that's another question later if I cannot fix it. In the meantime you fixed the error message I had, so well done and thanks for your help.


Expert Comment

ID: 1176927
Hmmm. Maybe there's some memory management problem (though there shouldn't be). Just to be sure, try to do:

size_t strLen = CashOrSwap.length();
char* strBuf = new char[strLen+1];
memcpy(strBuf,, strLen);
strBuf[strLen] = '\0;'
m_HkdRunTime = strBuf;

And see if anything good comes out of it. If it turns out good, see what happens when you delete strBuf.

Author Comment

ID: 1176928

I really appreciate your follow up on this question.
I have tried your suggestion but it still does not work.

Since it is probably not such an easy question, I have put it up with 40 points for grabs so that if you do find the solution you can be rewarded for your efforts. The heading of the question I have posted is: "Edit Box does not display output".

So hope to see you there.


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