How is CharUpper and CharLower used to convert a single char?

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Documentation located here :

http://msdn.microsoft.com/en-us/library/windows/desktop/ms647467(v=vs.85).aspx

says the function can convert single char, but each time I call the function with single char I always get a compile time error stating that a string is required.

Please can someone show me a line of code that illustrate how these functions are used to convert characters?

Posted 18-Feb-14 4:20am

Gbenbam

Updated 16-Mar-18 20:24pm

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2 solutions

Solution 2

I was also recently baffled by the documentation about this issue, here are the two versions of this function, note that this is a way of changing letters without directly using the crt.

C++

wchar_t nCharUpperW = LOWORD((DWORD)CharUpperW((LPWSTR)L'ñ'));
char nCharUpperA = LOBYTE(LOWORD((DWORD)CharUpperA((LPSTR)(WORD)'ñ')));

wchar_t nCharLowerW = LOWORD((DWORD)CharLowerW((LPWSTR)L'Ñ'));
char nCharLowerA = LOBYTE(LOWORD((DWORD)CharLowerA((LPSTR)(WORD)'Ñ')));

Posted 16-Mar-18 20:25pm

Pharago

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OriginalGriff · Accepted Answer · 2014-02-18T04:28:00

Solution 1

Look at the description:

"A null-terminated string, or specifies a single character. If the high-order word of this parameter is zero, the low-order word must contain a single character to be converted."
So all you have to do is:

C++

...  CharLower((LPTSTR) 'A');

Posted 18-Feb-14 4:28am

OriginalGriff

Comments

Gbenbam 18-Feb-14 10:33am

Believe me, I have read that billion times and never really understood it.Thanks a lot

OriginalGriff 18-Feb-14 10:34am

You're welcome!