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Zero value as a handle means error. The user can call GetError function to retrieve error description.
C/C++
char* GetError(HANDLE handle)
C#/VBA/scripts
string GetError(int handle)
Notes:
- zero value is acceptable as parameter in case last called function returns 0 as handle.
- the function accepts DG_HANGLE, PRJ_HANDLE, RULE_HANDLE, etc as a handle parameter.
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