Createevent returns error code 5 sometimes

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I have one exe which creates set of events.This event creation sometimes return error code 5 sometimes it is successful.

HANDLE event1 = CreateEvent(NULL, FALSE, FALSE,"Global\\event1");
if (NULL == event1)
{
DBG_TRACE_L1("Create event1 failed with an error code: "<< GetLastError());
}

HANDLE hEvent2= CreateEvent(NULL, FALSE, FALSE,"Global\\hEvent2");
if (NULL == hEvent2)
{
DBG_TRACE_L1("Create hEvent2 failed with an error code: "<< GetLastError());
}
HANDLE hEvent3= CreateEvent(NULL, FALSE, FALSE,"Global\\hEvent3");
if (NULL == hEvent3)
{
DBG_TRACE_L1("Create hEvent3 failed with an error code: "<< GetLastError());
}

when i try to open the event am getting error code 5

What I have tried:

I have one exe  which creates set of events.This event creation sometimes return error code 5 sometimes it is successful.

HANDLE event1 = CreateEvent(NULL, FALSE, FALSE,"Global\\event1");
    if (NULL == event1)
    {
		DBG_TRACE_L1("Create event1 failed with an error code: "<< GetLastError());
    }
	
	HANDLE hEvent2= CreateEvent(NULL, FALSE, FALSE,"Global\\hEvent2");
    if (NULL == hEvent2)
    {
		DBG_TRACE_L1("Create hEvent2 failed with an error code: "<< GetLastError());
    }
	HANDLE hEvent3= CreateEvent(NULL, FALSE, FALSE,"Global\\hEvent3");
    if (NULL == hEvent3)
    {
		DBG_TRACE_L1("Create hEvent3  failed with an error code: "<< GetLastError());
    }




 when i try to open the event am getting error code 5

Posted 7-Nov-19 21:50pm

Member 14648774

Updated 8-Nov-19 19:40pm

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Richard MacCutchan 8-Nov-19 9:47am

Where is the code that calls OpenEvent?

2 solutions

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KarstenK · Answer 1 · 2019-11-08T00:14:00

Solution 1

You need to have to correct access rights (as administrator) for the "Global" namespace.

If the event is already created, than you cant re create it. Read the documentation about CreateEvent.

Posted 8-Nov-19 0:14am

KarstenK

Comments

Member 14648774 8-Nov-19 8:08am

If the event is already created, createevent will fail.But the openevent should not fail in that case right?.openevent will return the already existing handle?

Shao Voon Wong · Answer 2 · 2019-11-08T19:40:00

According to this MS error page, error code 5 is "Access is denied". The application probably did not run with administrator rights. Since your CreateEvent fails, OpenEvent will fail too.

According to this MSDN CreateEvent Page,

Quote:
If the function succeeds, the return value is a handle to the event object. If the named event object existed before the function call, the function returns a handle to the existing object and GetLastError returns ERROR_ALREADY_EXISTS.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

ERROR_ALREADY_EXISTS is code 183. Right-click on your executable and run as administrator to see the "access is denied" problem still persists. The program that open the events also needs to run as an administrator because it is accessing a global object.