PRB: Error Message When You Try to Locate a NULL Pointer in Managed Extensions for C++ (310919)
The information in this article applies to:
- Microsoft Visual Studio .NET (2002), Professional Edition
- Microsoft Visual Studio .NET (2002), Enterprise Architect Edition
- Microsoft Visual Studio .NET (2002), Enterprise Developer Edition
- Microsoft Visual Studio .NET (2002), Academic Edition
This article was previously published under Q310919 SYMPTOMS
In a Managed Extensions for C++ project, when you try to locate a null pointer by using the following code:
System::Object* ptrObject;
if(ptrObject != NULL)
{
...
}
you may receive the following error message:
"error C2065: 'NULL' : undeclared identifier"
CAUSE
The null value is a macro that is defined in the C/C++ header files. Those header files are not included in Managed Extensions for C++ projects.
RESOLUTION
Use zero (0), instead of null, as in standard C++. The code resembles the following sample code:
System::Object* ptrObject;
if(ptrObject != 0)
{
...
}
STATUSThis behavior is by design.
| Modification Type: | Major | Last Reviewed: | 5/21/2002 |
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| Keywords: | kbprb KB310919 |
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