PRB: "Access to an Unnamed File Was Denied" Error (181880)
The information in this article applies to:
- Microsoft Visual C++ 4.0
- Microsoft Visual C++, 32-bit Enterprise Edition 5.0
- Microsoft Visual C++, 32-bit Enterprise Edition 6.0
- Microsoft Visual C++, 32-bit Professional Edition 5.0
- Microsoft Visual C++, 32-bit Professional Edition 6.0
- Microsoft Visual C++, 32-bit Learning Edition 6.0
This article was previously published under Q181880 SYMPTOMS
You get the following error when calling CFile::Read():
Access to an unnamed file was denied.
If run under the Microsoft Visual C++ debugger, you will see the following
error:
CFile exception: accessDenied, File Unknown, OS error information = 5
CAUSE
You are actually opening the file without read access. The following
intuitively correct code causes the error:
CFile cf;
int data;
cf.Open("myfile.dat", CFile::modeRead | CFile::modeWrite);
cf.Write(&data, sizeof(int));
cf.Read(&data, sizeof(int));
RESOLUTION
Specify CFile::modeReadWrite instead of the logical OR of CFile::modeRead
and CFile::modeWrite.
STATUS
This behavior is by design.
REFERENCES
For more information about CFile, or other MFC classes, consult the
Microsoft Visual C++ online help.
| Modification Type: | Major | Last Reviewed: | 12/8/2003 |
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| Keywords: | kbCodeGen kberrmsg kbprb KB181880 |
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