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lifeng · Posted: Wed Feb 06, 2008 1:54 pm Post subject:

Hi,

I am calling MQGET API using the following C++.Net code.

unsigned short readmessage(short indx )
{
unsigned short retcode=0;
gmo.Version = MQGMO_VERSION_2; gmo.MatchOptions = MQMO_NONE;

gmo.Options = MQGMO_WAIT
| MQGMO_CONVERT
| MQGMO_MSG_UNDER_CURSOR // <=== (1)
| MQGMO_ACCEPT_TRUNCATED_MSG;
gmo.WaitInterval = 1000;

md.Encoding = MQENC_NATIVE;
md.CodedCharSetId = MQCCSI_Q_MGR;

short x = MQCC_UNKNOWN;
short * rtn = &x;
char * buf = MQUtility::MQGET(indx, md, gmo, rtn);
retcode = (unsigned short)(*rtn);

return(retcode);
} // <=== (2)

Here, the function MQUtility::MQGET will call the MQQueue's Get method with options, etc. When I run this, the call returns with an exception of the following message:

"MQRC_NO_MSG_UNDER_CURSOR"

If, however, I comment out the line "| MQGMO_MSG_UNDER_CURSOR" (see line lable "<=== (1)") then I can read the message out (and I can see the value when I debug it). But, after that, right before the method finishes, I will get the following error at line ("<=== (2)"):

"The runtime has encountered a fatal error. The address of the error was at 0x7a2ba518, on thread 0x808. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack."

What am I doing wrong here? What should I do to fix it?

Thanks.

Lifeng