how to convert char array to LPCTSTR - c++

Question

I have function like this which takes variable number of argument and constructs
the string and passes it to another function to print the log .
logverbose( const char * format, ... )
{
char buffer[1024];
va_list args;
va_start (args, format);
vsprintf (buffer,format, args);
va_end (args);
LOGWriteEntry( "HERE I NEED TO PASS buffer AS LPCTSTR SO HOW TO CONVERT buffer to LPCTSTR??");
}
Instead of using buffer[1024] is there any other way? since log can be bigger or very smaller . All this am writing in C++ code please let me know if there is better way to do this .....

Answer 1

You can probably just pass it:
LOGWriteEntry (buffer);
If you are using ancient memory models with windows, you might have to explicitly cast it:
LOGWriteEntry ((LPCTSTR) buffer);
correction:
LPCTSTr is Long Pointer to a Const TCHAR STRing. (I overlooked the TCHAR) with the first answer.
You'll have to use the MultiByteToWideChar function to copy buffer to another buffer and pass that to the function:
w_char buf2 [1024];
MultiByteToWideChar (CP_ACP, 0, buffer, -1, buf2, sizeof buf2);
LOGWriteEntry (buf2);

Answer 2

A good way to proceed might be from among these alternatives:
Design the logverbose function to use TCHAR rather than char; or
Find out if the logging API provides a char version of LOGWriteEntry, and use that alternative.
If no char version of LOGWriteEntry exists, extend that API by writing one. Perhaps it can be written as a cut-and-paste clone of LOGWriteEntry, with all TCHAR use replaced by char, and lower-level functions replaced by their ASCII equivalents. For example, if LOGWriteEntry happens to call the Windows API function ReportEvent, your LOGWriteEntryA version could call ReportEventA.
Really, in modern applications, you should just forget about char and just use wchar_t everywhere (compatible with Microsoft's WCHAR). Under Unicode builds, TCHAR becomes WCHAR. Even if you don't provide a translated version of your program (all UI elements and help text is English), a program which uses wide characters can at least input, process and output international text, so it is "halfway there".