CFile in MFC

i am having problems writing to a file. i am getting an access violation writing to the file. ive dug through the documentation for about an hour and i still cant figure out what im doing wrong.

here is my save code

Code:

---

void CChildView::SaveMap( CString path )
{
        CFile file;

        const int SizeOfBuffer = mapSz.x * mapSz.y;
        int * buffer = new int [ SizeOfBuffer ];

        int sizeBuffer[2];

        try
        {
                file.Open( path, CFile::modeCreate );

                sizeBuffer[0] = mapSz.x;
                sizeBuffer[1] = mapSz.y;

                for ( int i = 0; i < mapSz.y; ++i )
                {
                        for ( int j = 0; j < mapSz.x; ++j )
                        {
                                buffer[i * mapSz.x + j] = map[i][j];
                        }
                }

                file.Write( sizeBuffer, 2 * sizeof(int));
                file.Write( buffer, SizeOfBuffer * sizeof(int));

        }

        catch (void)
        {
                MessageBox( "An error occured while writing to the file" );
        }

        delete [] buffer;

        file.Close();

        mapHasBeenEdited = FALSE;
       
}

---

CFile Open() does not throw an exception.

You have to test the return != FALSE

Does the path contain the correct file name (try setting the string locally to create a test file)

Does the file create ie return TRUE?

If not what does GetLastError() return?

Quote:

---

Read takes a pointer to a buffer and the number of bytes to read and returns the actual number of bytes that were read. If the required number of bytes could not be read because end-of-file (EOF) is reached, the actual number of bytes read is returned. If any read error occurs, an exception is thrown. Write is similar to Read, but the number of bytes written is not returned. If a write error occurs, including not writing all the bytes specified, an exception is thrown.

---

straight from MSDN documentation. i put the whole file opening/writing process in the try block just to be on the safe side.

everything returns true, everything works fine, a file is created, but the file is always empty and i get an "access to (pathname) was denied" error.

i ran it through debugger and it choked on this line :

Code:

---

file.Write( sizeBuffer, 2 * sizeof(int));
file.Write( buffer, SizeOfBuffer * sizeof(int));

---

OK so the file is created.

We can move on and look at the writing functions

try

CFile::modeCreate | CFile::modeWrite

if this does not help

then try using a char buffer to write data to the file.

use the 'path' buffer as you know what it contains.

ive already tried using all of the different modes, and i just tried writing a string to the file with no luck. the file is still empty.

same error, same place.

Do you have permissions on the file for these operations? Your being denied access to the newly created file. Perhaps it is a lack of or improperly set permissions on your computer if you're using Linux, Unix, Windows NT, Windows 2000, or Windows XP.