/// <summary>
/// Gets the count.
/// http://blog.codebeside.org/archive/2008/08/27/counting-the-number-of-messages-in-a-message-queue-in.aspx
/// </summary>
/// <param name="self">The self.</param>
/// <returns></returns>
public static int GetCount(this MessageQueue self)
{
if (!MessageQueue.Exists(self.MachineName + @"\" + self.QueueName))
{
return(0);
}
var props = new NativeMethods.MQMGMTPROPS {
cProp = 1
};
try
{
props.aPropID = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(props.aPropID, NativeMethods.PROPID_MGMT_QUEUE_MESSAGE_COUNT);
props.aPropVar = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.MQPROPVariant)));
Marshal.StructureToPtr(new NativeMethods.MQPROPVariant {
vt = NativeMethods.VT_NULL
}, props.aPropVar,
false);
props.status = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(props.status, 0);
int result = NativeMethods.MQMgmtGetInfo(null, "queue=" + self.FormatName, ref props);
if (result != 0)
{
throw new Win32Exception(result);
}
if (Marshal.ReadInt32(props.status) != 0)
{
return(0);
}
var propVar =
(NativeMethods.MQPROPVariant)
Marshal.PtrToStructure(props.aPropVar, typeof(NativeMethods.MQPROPVariant));
if (propVar.vt != NativeMethods.VT_UI4)
{
return(0);
}
else
{
return(Convert.ToInt32(propVar.ulVal));
}
}
finally
{
Marshal.FreeHGlobal(props.aPropID);
Marshal.FreeHGlobal(props.aPropVar);
Marshal.FreeHGlobal(props.status);
}
}
/// <summary>
/// Gets the count.
/// http://blog.codebeside.org/archive/2008/08/27/counting-the-number-of-messages-in-a-message-queue-in.aspx
/// </summary>
/// <param name="self">The self.</param>
/// <returns></returns>
public static int GetCount(this MessageQueue self)
{
if (!MessageQueue.Exists(self.MachineName + @"\" + self.QueueName))
{
return 0;
}
var props = new NativeMethods.MQMGMTPROPS { cProp = 1 };
try
{
props.aPropID = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(props.aPropID, NativeMethods.PROPID_MGMT_QUEUE_MESSAGE_COUNT);
props.aPropVar = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.MQPROPVariant)));
Marshal.StructureToPtr(new NativeMethods.MQPROPVariant { vt = NativeMethods.VT_NULL }, props.aPropVar, false);
props.status = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(props.status, 0);
int result = NativeMethods.MQMgmtGetInfo(null, "queue=" + self.FormatName, ref props);
if (result != 0)
throw new Win32Exception(result);
if (Marshal.ReadInt32(props.status) != 0)
{
return 0;
}
var propVar = (NativeMethods.MQPROPVariant)Marshal.PtrToStructure(props.aPropVar, typeof(NativeMethods.MQPROPVariant));
if (propVar.vt != NativeMethods.VT_UI4)
{
return 0;
}
else
{
return Convert.ToInt32(propVar.ulVal);
}
}
finally
{
Marshal.FreeHGlobal(props.aPropID);
Marshal.FreeHGlobal(props.aPropVar);
Marshal.FreeHGlobal(props.status);
}
}
