FIX: GPF/UAE When Assign NULL to VBM_GETPROPERTY of type HLSTD (94217)
The information in this article applies to:
- Microsoft Visual Basic Standard Edition for Windows 2.0
This article was previously published under Q94217 SYMPTOMS
When you return a NULL in response to the VBM_GETPROPERTY message for a
custom property of data type HLSTR, a General Protection (GP) fault or
Unrecoverable Application Error (UAE) occurs.
Because of this problem, you cannot simply use the PF_fGetData flag with
a custom property of data type HLSTR. What's more, you must use the
PF_fGetMsg flag to ensure that the value of the property is never set to
NULL. This information is taken from the CDK.TXT file provided with
Microsoft Visual Basic Professional Edition version 2.0 for Windows.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Visual Basic
Professional Edition version 2.0 for Windows. This problem was corrected
in Microsoft Visual Basic version 3.0 for Windows.
MORE INFORMATION
Below is the information provided in the CDK.TXT file:
DT-HLSTR Properties and PF_fGetData
DT_HLSTR properties cannot use PF_fGetData by itself. They must also
use PF_fGetMsg to avoid returning a NULL hlstr. See the MyTag property
in the PIX example (PIX.C) for a guide for how to properly declare a
HLSTR property and process the VBM_GETPROPERTY message.
| Modification Type: | Minor | Last Reviewed: | 1/8/2003 |
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| Keywords: | kbbug KB94217 |
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