Hi All,
I wanted to use WaitForMultipleObjects in C#. Following is the
code:

[DllImport("kernel32.dll", SetLastError=true)]
static extern int WaitForMultipleObjects ( int nCount, ref IntPtr
[]lpHandles, int bWaitAll, uint dwMilliseconds);
....
IntPtr []HandleArray = new IntPtr[2];
HandleArray[0] = (IntPtr)m_iStopEventHandle;
HandleArray[1] = (IntPtr)m_iTimerHandle;
int iRet = WaitForMultipleObjects(2, ref HandleArray, 1, INFINITE);
....

I am getting -1 (Invalid handle) as the return value.
If I use the 2 handles( m_iStopEventHandle and m_iTimerHandle) then
WaitForMultipleObjects works fine.
Please let me know if I am doing anything wrong with the pinvoke.

Thanks in advance.
nachiket

Hi,

Arrays are marshalled to pointers by default, so you don't have to add
"ref" in the parameter.

[DllImport("kernel32.dll")]
static extern uint WaitForMultipleObjects(uint nCount, IntPtr [] lpHandles,
bool bWaitAll, uint dwMilliseconds);

Hope this helps.

<nachiket_pict_2002 (AT) yahoo (DOT) co.in> wrote

Thanks for the reply.
I have not used WaitHandle since I have created the event and the timer
using p-invoke

Thanks for the reply.
I have not used WaitHandle since I have created the event and the timer
using p-invoke.

Regards,
Nachiket