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How to use copyfile in vc6?

Last Modified: 2013-12-14

Currently I can not copy files from one folder to others. I'm using copyfile but the process failed without an error.
check code snippet as below :

	LPCTSTR lpExistingFileName = "C:\\\\Product\\New\\\\product1.txt";
	LPCTSTR lpNewFileName = "C:\\\\Product\\\\Beta\\\\";

	CString msgbuf;
	printf(msgbuf, "Cannot open file %s [err=%ld]\n",GetLastError());

No Error when I try to output getlasterror.

I'm using vc6.

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