CreateFile - " file is being used by another process." [modified]

[Cvaji]

Hi All, I am using CreateFile to open a specific file which will be accessed by multiple instance of same process simultaneously. This time function getting failed and GetLastError() is returning the following error. "The process cannot access the file because it is being used by another process." This is how i called the function

hFile = ::CreateFile( csFileName_i.operator LPCTSTR(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
if( INVALID_HANDLE_VALUE == hFile )
{
CString csErr;
csErr.Format( _T("Failed to open File**** Error code = %d"), GetLastError());
AfxMessageBox( csErr );
return bRet;
}

I need to open the same file simultaneously by different process. Please help me. -Cvaji

modified on Thursday, July 15, 2010 9:30 AM

[Niklas L]

Is one of your processes writing to the file (looking at your other question)? In that case you need to specify the sharing mode there too.

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[Naveen]

Cvaji wrote:

hFile = ::CreateFile( csFileName_i.operator LPCTSTR(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );if( INVALID_HANDLE_VALUE == hSMPFile )

The return value of the CreateFile is stored in **hFile**, but you have checked the INVALID_HANDLE_VALUE aganist **hSMPFile** file. Is it really like that in the code or its just a typo?

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[Cvaji]

Even though my application is only doing the file read,

::CreateFile( csFileName_i.operator LPCTSTR(), GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );

this made it work. Strange :confused: :)

[Cvaji]

sorry my friend..its just a mistake.. :)