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_set_com_error_handler

 

The latest version of this topic can be found at _set_com_error_handler.

Microsoft Specific**

Replaces the default function that is used for COM error-handling.

Syntax

void __stdcall _set_com_error_handler(  
   void (__stdcall *pHandler)(  
      HRESULT hr,   
      IErrorInfo* perrinfo  
   )  
);  

Parameters

pHandler
Pointer to the replacement function.

hr
HRESULT information.

perrinfo
IErrorInfo object.

Remarks

By default, _com_raise_error handles all COM errors. You can change this behavior by using _set_com_error_handler to call your own error-handling function.

The replacement function must have a signature that is equivalent to that of _com_raise_error.

Example

// _set_com_error_handler.cpp  
// compile with /EHsc  
#include <stdio.h>  
#include <comdef.h>  
#include <comutil.h>  
  
// Importing ado dll to attempt to establish an ado connection.  
// Not related to _set_com_error_handler   
#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")  
  
void __stdcall _My_com_raise_error(HRESULT hr, IErrorInfo* perrinfo)  
{  
   throw "Unable to establish the connection!";  
}  
  
int main()  
{  
   _set_com_error_handler(_My_com_raise_error);  
   _bstr_t bstrEmpty(L"");  
   _ConnectionPtr Connection = NULL;  
   try  
   {  
      Connection.CreateInstance(__uuidof(Connection));  
      Connection->Open(bstrEmpty, bstrEmpty, bstrEmpty, 0);   
   }  
   catch(char* errorMessage)  
   {  
      printf("Exception raised: %s\n", errorMessage);  
   }  
  
   return 0;  
}  
Exception raised: Unable to establish the connection!  

Requirements

Header: comdef.h

Lib: If the “wchar_t is Native Type” compiler option is on, use comsuppw.lib or comsuppwd.lib. If “wchar_t is Native Type” is off, use comsupp.lib. For more information, see /Zc:wchar_t (wchar_t Is Native Type).

See Also

Compiler COM Global Functions