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Win GetFileSize() problem

Started by Tertsi Nov 28, 2004 at 6:27 AM 1 replies 550+ views

Original Post

Nov 28, 2004 at 6:27 AM


// C++

HANDLE hFile = CreateFile("C:\\whatever\\whatever.log", GENERIC_READ | GENERIC_WRITE, 0, NULL, NULL, FILE_ATTRIBUTE_NORMAL, NULL);
	unsigned long filesize = GetFileSize(hFile, NULL);
	cout << "MGEngine.log filesize: " << filesize << endl;

	CloseHandle(hFile);
	return 0;

How come this code doesn't display the correct filesize of any file you try to test this with, and instead GetFileSize just returns an error? [Edited by - Tertsi on November 28, 2004 7:15:56 AM]

darookie

121

darookie

Nov 28, 2004 at 6:47 AM

Read the docs for CreateFile carefully:

HANDLE hFile = CreateFile("C:\\whatever\\whatever.log", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

Attributes need to be OR'ed bit-wise, not logically.
A logical OR will always result in the value TRUE ('1' IIRC), while bit-wise OR will combine the values (same as adding them for powers of two).

Tertsi

Author

Tertsi

Nov 28, 2004 at 7:15 AM

heh, oops I knew that, just a typo. ^^

Anyway the docs also mentioned that you can use either one of the access flags and I had tried using read without write. The open existing flag seemed to solve my problem though, thanks!

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