PRB: Win32s Version of MSVCRT20.DLL and the iostream Classes

ID: Q125497

The information in this article applies to:

The C Run-Time (CRT), included with:
- Microsoft Visual C++, 32-bit Editions, version 2.0

SYMPTOMS

Under Win32s, when you run multiple Win32-based applications that use the iostream classes provided by MSVCRT20.DLL, you will get unexpected errors or unexpected behavior.

In addition, if the application references the global iostream objects cin, cout, cerr, or clog, it will fail at load time with Win32s errors. Win32s will display an error message similar to this one:


   The procedure entry point "?cerr@@3Vostream_withassign@@E"
   could not be located in Dynamic Link Library "MSVCRT20.DLL".

where "?cerr@@3Vostream_withassign@@E" is the decorated name for the cerr object. The error message may contain one of these decorated names for the other iostream objects instead:


   "?cin@@3Vistream_withassign@@E"
   "?cout@@3Vostream_withassign@@E"
   "?clog@@3Vostream_withassign@@E"

CAUSE

The Win32s version of the run-time library DLL (MSVCRT20.DLL) does not support multiple applications using the iostream classes at the same time. It also does not provide the global iostream objects cin, cout, cerr, or clog. A Win32-based application that references them can be built without errors, but it will fail at load time on Win32s, as described above.

RESOLUTION

You can continue to use MSVCRT20.DLL as long as there is only one Win32s application using the iostream classes in the DLL at one time. If your application references the global iostream objects, then you must remove those references when you are building the application to run on Win32s.

MORE INFORMATION

The Win32s version of MSVCRT20.DLL is located in the WIN32S\REDIST directory of the Visual C++ version 2.0 CD-ROM.

REFERENCES

"C Run-time Support" section in Chapter 3 of Win32 Programmer's Reference, Win32s manual.

Additional query words: 1.20

Keywords : kbCRT kbVC kbWin32s
Version : 2.0
Platform : NT WINDOWS
Issue type : kbprb