Problem with numerical data in edit box

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I can not figure out why converting back to a string isn't working

MIDL

m_wndLoanAmt.GetWindowTextW(m_dbLoanAmt);
LoanAmt = _wtof(m_dbLoanAmt);
FeeAmt = LoanAmt*Percent;
PickupAmt = LoanAmt+FeeAmt;

m_dbFeeAmt.Format("%.2f", FeeAmt);     // Error
m_dbPkUpAmt.Format("%.2f", PickupAmt); // Error

1>visual studio 2010\projects\editctrltest\editctrltest\editctrltestview.cpp(112): error C2664: 'void ATL::CStringT<BaseType,StringTraits>::Format(const wchar_t *,...)' : cannot convert parameter 1 from 'const char [5]' to 'const wchar_t *'

Posted 15-Jun-11 16:58pm

DrBones69

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-06-15T17:04:00

Solution 1

You use immediate string constant in the form of literal "%.2f". For C++ this is an array or string of char, but your Format function require wchar_t.

So, prefix the string literal by 'L' to fix it: use L"%.2f".

—SA

Posted 15-Jun-11 17:04pm

Sergey Alexandrovich Kryukov

Updated 15-Jun-11 18:45pm

v2

Comments

DrBones69 15-Jun-11 23:54pm

Thank You, do you have all the answers? Do you think you can connect an RJ-45 cable directly to your brain, so that I may get wired in?

Sergey Alexandrovich Kryukov 16-Jun-11 0:31am

Thank you, Randy. Your ideas make me worry. Don't do it at home. :-)
--SA

barneyman · Accepted Answer · 2011-06-15T17:06:00

Solution 2

wrap the text in _T(), you're working with wide strings, and giving Format a narrow

m_dbFeeAmt.Format(_T("%.2f"), FeeAmt);     // Error
m_dbPkUpAmt.Format(_T("%.2f"), PickupAmt); // Error

(nods to SA)

The _T() macro is extremely useful, it substitutes as appropriate, for the string types you're using, as a rule of thumb, wrap all const strings in _T(), similarly use the _t* string manipulators (like _tprintf for printf and _tcstok for strtok, for example)

Posted 15-Jun-11 17:06pm

barneyman

Updated 15-Jun-11 18:56pm

v2

Comments

DrBones69 15-Jun-11 23:56pm

Thanks to all that help me through the rough stages, someday I will return the favors. HOPEFULLY SOON! :)

Sergey Alexandrovich Kryukov 16-Jun-11 0:47am

This is event better way, my 5.
You should only explain this macro (portable between different pre-processor definitions: support Unicode or not).
--SA