I am reading Charles Petzoid''s Book "Programming Windows Fifth Edition". Now frankly I have only done C++ so I don''t know much about printf and so forth functions. Is there another way? Here''s the program. ----------------------------------------------------------------- #include #include #include int CDECL MessageBoxPrintf (TCHAR * szCaption, TCHAR * szFormat, ...) { TCHAR szBuffer [1024]; va_list pArgList; va_start (pArgList, szFormat); _vsntprintf(szBuffer, sizeof(szBuffer)/sizeof (TCHAR), szFormat, pArgList); va_end(pArgList); return MessageBox(NULL, szBuffer, szCaption, 0); } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { int cxScreen, cyScreen; cxScreen = GetSystemMetrics(SM_CXSCREEN); cyScreen = GetSystemMetrics(SM_CYSCREEN); MessageBoxPrintf(TEXT ("ScrnSize"), TEXT ("The screen is %i pixels wide by %i pixels high."), cxScreen, cyScreen); return 0; } Timothy "TriWolf" Russell

I''ve seen this kind of code before, it''s just a way of making a function that has an unspecific number of arguments. The va_ stuff is dealing with the extra arguments. _vsntprintf is like sprintf but it takes a constant number of parameters to construct the string you want in your message box.

AFAIK this is really the only way to make a function with no specified limit to the number of arguments it takes. I have never seen any code that does the same thing in a different way that is easier.

printf, sprintf, fprintf and all those kind of functions are really very simple to use. I am sure it won''t take much time to get to know them.

Harry.

Could anyone recommend a website for learning the C i/o functions. Becuase I can''t afford yet another book right now.

Timothy "TriWolf" Russell

www.introl.com/introl-demo/Libraries/C/ANSI-C/contents.html

A free reference to most standard functions in the standard library.

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A wise man once said "A person with half a clue is more dangerous than a person with or without one."

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Thanks all the help is great of you. Oh and Null and void the I did find his page and here is the correct address.

http://www.introl.com/introl-demo/Libraries/C/ANSI_C/contents.html
Once agian thanks and I feel a lot better. I''m on my way to working in the gaming industry .

Timothy "TriWolf" Russell