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Trouble with FindFirstFile (Win32)

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Hi, the following code uses to work fine (it finds all the files I'm looking for) until I try to edit any of those files (using fopen and then fclose, I'm pretty sure I close them correctly before I try to list them again). After that, the FindFirstFile stops finding my files returning INVALID_HANDLE_VALUE, as if they wouldn't exist. Here is the code:
WIN32_FIND_DATA FindFileData;
HANDLE hFind = INVALID_HANDLE_VALUE;

hFind = FindFirstFile("entities\*.ent", &FindFileData);

if (hFind == INVALID_HANDLE_VALUE) 
{
	std::cerr << "cFileListing::GetNumFiles - directory/files not found.\n";
	return -1;
}
int nNumFiles = 1;

while (FindNextFile(hFind, &FindFileData) != 0)
{
	nNumFiles++;
}
FindClose(hFind);

What's going on? Any clue?

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Perhaps you change your current directory?
So that the path is no longer valid. Try using an absolute path (as in 'C:\...etc).

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I tried using the absolute path and it finally worked fine. Thanks. Why does it happen only if my program reads one of the files in the path?

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Most likely something is changing the working directory. There are a few ways the working can change (e.g. calling GetOpenFileName).

In general, it's not a good idea to rely on the working directory remaining consistent throughout the life of your program. What I usually do is when the program starts up, save off the working directory and manually combine that saved working directory with any relative paths I want to use.

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