Kbase P136272: Calling DLL function with struct parameter crashes the session if C struct contains double datatype
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/21/2008 |
|
Status: Unverified
SYMPTOM(s):
Calling DLL function with struct parameter crashes the session if C struct contains double datatype
C struct definition contains values of the "double" datatype among other datatypes
Passing a MEMPTR to the DLL function containing the raw data
MEMPTR is populated using PUT-* functions including PUT-DOUBLE().
Session crashes when DLL function is called (on the RUN ... statement)
FACT(s) (Environment):
Progress 9.x
OpenEdge 10.x
Windows
CAUSE:
The raw data in the MEMPTR did not match the expected byte alignment for the C struct.
On Windows, the C double datatype is 8-byte aligned, meaning that in the raw data for the struct, the value can only start on the ((n x 8 ) + 1) th bytes
FIX:
Ensure that any offset used in a PUT-DOUBLE function call is (n x 8) + 1 to ensure the data is properly aligned for the C struct.