_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).