CODEWITHSUNDEEP
c++windowswinapidll
SteveL
SteveL

Reputation: 1821

Calling NT function on pre-NT system

So I don't do a lot of Win32 calls, but recently I have had to use the GetFileTime() and SetFileTime() functions. Now although Win98 and below are not officially supported in my program people do use it there anyway, and I try to keep it as usable as possible. I was just wondering what will happen as those functions do not exist in pre-NT systems, will they receive an error message of some sort for example because in that case I will add in an OS check? Thanks

Upvotes: 6

Views: 511

Answers (3)

Roland Rabien
Roland Rabien

Reputation: 8836

If you call the functions directly, then your program will not load on Win98.

What you can do is use LoadLibrary() / GetProcAddress() to get a pointer to GetFileTime() / SetFileTime(). On Win98 this will fail, giving you a null pointer which you can test for and ignore. On 2000 and later you will get a pointer which you can then use.

It's a pain, but it's the only solution I know of.

Here is an example of getting the UpdateLayeredWindow function if it exists:

typedef BOOL (WINAPI* UpdateLayeredWinFunc) (HWND, HDC, POINT*, SIZE*, HDC, POINT*, COLORREF, BLENDFUNCTION*, DWORD);

UpdateLayeredWinFunc updateLayeredWindow = 0;
HMODULE user32Mod = GetModuleHandle (_T("user32.dll"));
updateLayeredWindow = (UpdateLayeredWinFunc) GetProcAddress (user32Mod, "UpdateLayeredWindow");

Upvotes: 8

MSalters
MSalters

Reputation: 179779

You could call FindFirstFile() instead of GetFileTime(). I wouldn't know an alternative for SetFileTime(), though.

Upvotes: 0

Michael Stum
Michael Stum

Reputation: 180874

I believe you get an error message along the lines of "The procedure entry point (name) could not be located in (dll)", similar th the one shown:

example http://img266.imageshack.us/img266/3762/error2pm1.png

Upvotes: 0

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