A simple routine to allow CString formatted strings to be used wherever a regular LPCSTR would be used, without needing to define a CString (ie, dynamically created and formatted LPCSTR strings)
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Environment: VC6 SP4
Well, I’ve seen other people asking for a class like this, and I sure wanted one, so I finally wrote one.
Suppose you want to call a routine with a dynamically constructed LPCSTR. You would call it like this:
SampleRoutine( (LPCSTR) csFMT( "Sample dynamic string count(%d) name(%s)", nAnInteger, szAZeroTerminatedString));
The Microsoft CString class provides a Format member routine which
provides sprintf-type formatting, without the need to allocate a buffer.
The class CString automatically calculates the size of the buffer required,
and allocates it. A CString variable, however, must first be declared. This routine allows the CString Format member routine to be used, without needing to declare
a CString.
Here is the sample code without using the “csFmt” routine:
CString csTemp; CsTemp.Format("Sample dynamic string count(%d) name(%s)", nAnInteger, szAZeroTerminatedString); SampleRoutine((LPCSTR) csTemp);
This method doesn’t require any subclassing, and is only a short < 10 line routine.
CString csFMT(LPCSTR lpszFormat, …)
{
CString csStr;va_list argList;
va_start(argList, lpszFormat);
csStr.FormatV(lpszFormat, argList);
return csStr;
}
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You can cut & paste code from above.