OutPutDebugStringW Issue

[gothic_coder]

Hello all, I'm trying to print the filename to Dbgview which i receive from GetFileInformationByHandleEx, But it's getting crashed every time..

PFILE_NAME_INFO pFileNameInfo;
DWORD dwFileNameLength = 1024;
DWORD err;
TCHAR szTemp[MAX_PATH] = "";

pFileNameInfo = (PFILE_NAME_INFO)HeapAlloc(GetProcessHeap(), 0, dwFileNameLength);

if(pFileNameInfo != NULL)
{
if(GetFileInformationByHandleEx(FileHandle, FileNameInfo, &pFileNameInfo, dwFileNameLength) != 0)
{
MessageBox(NULL, L"Before Check", L"Success", MB_OK);
OutputDebugStringW(pFileNameInfo->FileName);
}
else
{
err = GetLastError();
swprintf(szTemp, L"Get info Error = %d", err);
MessageBox(NULL, szTemp, L"Error", MB_OK);
}
HeapFree(GetProcessHeap(), 0, pFileNameInfo);
}
else
{
err = GetLastError();
swprintf(szTemp, L"Heap Error = %d", err);
MessageBox(NULL, szTemp, L"Error", MB_OK);
}

Thanks All..

[Iain Clarke Warrior Programmer]

Have you tried single stepping? Do you end up with a filename which should be NULL terminated, but is not? If it's crashing all the time, it sounds simple to find with a debugger! If nothing else, you'll know WHICH line is crashing. Have you tried with a small filename? Iain.

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[Lost User]

You are sending the address of your memory pointer rather than the pointer itself to the GetFileInformationByHandleEx() function. The code should read:

if (GetFileInformationByHandleEx(FileHandle, FileNameInfo, pFileNameInfo, dwFileNameLength) != 0)

Note: no & (addressof operator) on pFileNameInfo.

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[gothic_coder]

Yes, Silly Mistake, There shouldn't be &.. Thanks Also how do i get the real path? pFileInfo->FileName gives me "\sample\a.txt"and i need "C:\sample\a.txt"

[Lost User]

gothic_coder wrote:

how do i get the real path?

I'm not sure offhand, I would suggest checking the MSDN documentation for this function and seeing if it has any links to other similar functions.

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