Reading Message from MSMQ using C++ - c++

Question

I am currently working on a C++ application that will read the message from the MSMQ.....
this is the code that I ran :
HRESULT ReadingDestQueue(
WCHAR * wszQueueName,
WCHAR * wszComputerName
)
{
// Define the required constants and variables.
const int NUMBEROFPROPERTIES = 5;
DWORD cPropId = 0;
HRESULT hr = MQ_OK; // Return code
HANDLE hQueue = NULL; // Queue handle
ULONG ulBufferSize = 2;
// Define an MQMSGPROPS structure.
MQMSGPROPS msgprops;
MSGPROPID aMsgPropId[NUMBEROFPROPERTIES];
MQPROPVARIANT aMsgPropVar[NUMBEROFPROPERTIES];
HRESULT aMsgStatus[NUMBEROFPROPERTIES];
// Specify the message properties to be retrieved.
aMsgPropId[cPropId] = PROPID_M_LABEL_LEN; // Property ID
aMsgPropVar[cPropId].vt = VT_UI4; // Type indicator
aMsgPropVar[cPropId].ulVal = MQ_MAX_MSG_LABEL_LEN; // Length of label
cPropId++;
WCHAR wszLabelBuffer[MQ_MAX_MSG_LABEL_LEN]; // Label buffer
aMsgPropId[cPropId] = PROPID_M_LABEL; // Property ID
aMsgPropVar[cPropId].vt = VT_LPWSTR; // Type indicator
aMsgPropVar[cPropId].pwszVal = wszLabelBuffer; // Label buffer
cPropId++;
UCHAR * pucBodyBuffer = NULL;
pucBodyBuffer = (UCHAR*)malloc(ulBufferSize);
if (pucBodyBuffer == NULL)
{
return MQ_ERROR_INSUFFICIENT_RESOURCES;
}
memset(pucBodyBuffer, 0, ulBufferSize);
aMsgPropId[cPropId] = PROPID_M_BODY_SIZE; // Property ID
aMsgPropVar[cPropId].vt = VT_NULL; // Type indicator
cPropId++;
aMsgPropId[cPropId] = PROPID_M_BODY; // Property ID
aMsgPropVar[cPropId].vt = VT_VECTOR | VT_UI1; // Type indicator
aMsgPropVar[cPropId].caub.pElems = (UCHAR*)pucBodyBuffer; // Body buffer
aMsgPropVar[cPropId].caub.cElems = ulBufferSize; // Buffer size
cPropId++;
aMsgPropId[cPropId] = PROPID_M_BODY_TYPE; // Property ID
aMsgPropVar[cPropId].vt = VT_NULL; // Type indicator
cPropId++;
// Initialize the MQMSGPROPS structure.
msgprops.cProp = cPropId; // Number of message properties
msgprops.aPropID = aMsgPropId; // IDs of the message properties
msgprops.aPropVar = aMsgPropVar; // Values of the message properties
msgprops.aStatus = aMsgStatus; // Error reports
// Validate the input strings.
if (wszQueueName == NULL || wszComputerName == NULL)
{
return MQ_ERROR_INVALID_PARAMETER;
}
// Create a direct format name.
WCHAR * wszFormatName = NULL;
DWORD dwFormatNameLength = 0;
dwFormatNameLength = wcslen(wszQueueName) + wcslen(wszComputerName) + 12;
wszFormatName = new WCHAR[dwFormatNameLength];
if (wszFormatName == NULL)
{
return MQ_ERROR_INSUFFICIENT_RESOURCES;
}
memset(wszFormatName, 0, dwFormatNameLength);
// ************************************
// You must concatenate "DIRECT=OS:", wszComputerName, "\",
// and wszQueueName into the wszFormatName buffer.
// wszFormatName = "DIRECT=OS:" + wszComputerName + "\" +
// wszQueueName
// If the format name is too long for the buffer, return FALSE.
// ************************************
// Open the queue with receive access.
hr = MQOpenQueue(
wszFormatName, // Format name of the queue
MQ_RECEIVE_ACCESS, // Access mode
MQ_DENY_NONE, // Share mode
&hQueue // OUT: Queue handle
);
// Free the memory that was allocated for the format name string.
if (wszFormatName)
{
delete[] wszFormatName;
}
// Handle any error returned by MQOpenQueue.
if (FAILED(hr))
{
return hr;
}
for (; ; )
{
aMsgPropVar[0].ulVal = MQ_MAX_MSG_LABEL_LEN;
hr = MQReceiveMessage(
hQueue, // Queue handle
1000, // Max time to (msec) to receive the message
MQ_ACTION_RECEIVE, // Receive action
&msgprops, // Message property structure
NULL, // No OVERLAPPED structure
NULL, // No callback function
NULL, // No cursor handle
MQ_NO_TRANSACTION // Not in a transaction
);
if (hr == MQ_ERROR_BUFFER_OVERFLOW)
{
ulBufferSize = aMsgPropVar[2].ulVal * sizeof(UCHAR);
pucBodyBuffer = (UCHAR*)realloc(pucBodyBuffer, ulBufferSize);
if (pucBodyBuffer == NULL)
{
return MQ_ERROR_INSUFFICIENT_RESOURCES;
}
memset(pucBodyBuffer, 0, ulBufferSize);
aMsgPropVar[3].caub.pElems = (UCHAR*)pucBodyBuffer;
aMsgPropVar[3].caub.cElems = ulBufferSize;
continue;
}
if (FAILED(hr))
{
wprintf(L"No messages. Closing queue\n");
break;
}
// If the message contains a label, print it.
if (msgprops.aPropVar[0].ulVal == 0)
{
wprintf(L"Removed message from queue.\n");
}
else
{
wprintf(L"Removed message '%s' from queue.\n", wszLabelBuffer);
}
// If the message body is a string, display it.
if (msgprops.aPropVar[4].ulVal == VT_BSTR)
{
wprintf(L"Body: %s", (WCHAR*)pucBodyBuffer);
wprintf(L"\n");
}
}
// Close the queue and free the memory allocated for the body buffer.
hr = MQCloseQueue(hQueue);
free(pucBodyBuffer);
return hr;
}
int main()
{
WCHAR wszComputerName =(WCHAR)L"wsm-ela-inc5";
WCHAR wszQueueName = (WCHAR)L"private$\\soorya1";
_com_error err(ReadingDestQueue(&wszQueueName, &wszComputerName));
LPCTSTR errMsg = err.ErrorMessage();
wcout << errMsg;
return 0;
}
this is my MSMQ queue :
when I run this...I am getting an error code of "0xC00E001E" (MQ_ERROR_ILLEGAL_FORMATNAME (0xC00E001E)
Returned when the specified format name is not valid)
any methods to recover this?

Answer 1

Passing the format name itself did the trick!
here is the code :
// ReadMsg.cpp : Defines the entry point for the console application.
//
#define _CRT_SECURE_NO_DEPRECATE
#include "stdafx.h"
#include "windows.h"
#include "mq.h"
#include "tchar.h"
#include"comdef.h"
#include"iostream"
using namespace std;
HRESULT ReadingDestQueue( LPWSTR lpwcsFormatName)
{
// Define the required constants and variables.
const int NUMBEROFPROPERTIES = 5;
DWORD cPropId = 0;
HRESULT hr = MQ_OK; // Return code
HANDLE hQueue = NULL; // Queue handle
ULONG ulBufferSize = 2;
// Define an MQMSGPROPS structure.
MQMSGPROPS msgprops;
MSGPROPID aMsgPropId[NUMBEROFPROPERTIES];
MQPROPVARIANT aMsgPropVar[NUMBEROFPROPERTIES];
HRESULT aMsgStatus[NUMBEROFPROPERTIES];
// Specify the message properties to be retrieved.
aMsgPropId[cPropId] = PROPID_M_LABEL_LEN; // Property ID
aMsgPropVar[cPropId].vt = VT_UI4; // Type indicator
aMsgPropVar[cPropId].ulVal = MQ_MAX_MSG_LABEL_LEN; // Length of label
cPropId++;
WCHAR wszLabelBuffer[MQ_MAX_MSG_LABEL_LEN]; // Label buffer
aMsgPropId[cPropId] = PROPID_M_LABEL; // Property ID
aMsgPropVar[cPropId].vt = VT_LPWSTR; // Type indicator
aMsgPropVar[cPropId].pwszVal = wszLabelBuffer; // Label buffer
cPropId++;
UCHAR * pucBodyBuffer = NULL;
pucBodyBuffer = (UCHAR*)malloc(ulBufferSize);
if (pucBodyBuffer == NULL)
{
return MQ_ERROR_INSUFFICIENT_RESOURCES;
}
memset(pucBodyBuffer, 0, ulBufferSize);
aMsgPropId[cPropId] = PROPID_M_BODY_SIZE; // Property ID
aMsgPropVar[cPropId].vt = VT_NULL; // Type indicator
cPropId++;
aMsgPropId[cPropId] = PROPID_M_BODY; // Property ID
aMsgPropVar[cPropId].vt = VT_VECTOR | VT_UI1; // Type indicator
aMsgPropVar[cPropId].caub.pElems = (UCHAR*)pucBodyBuffer; // Body buffer
aMsgPropVar[cPropId].caub.cElems = ulBufferSize; // Buffer size
cPropId++;
aMsgPropId[cPropId] = PROPID_M_BODY_TYPE; // Property ID
aMsgPropVar[cPropId].vt = VT_NULL; // Type indicator
cPropId++;
// Initialize the MQMSGPROPS structure.
msgprops.cProp = cPropId; // Number of message properties
msgprops.aPropID = aMsgPropId; // IDs of the message properties
msgprops.aPropVar = aMsgPropVar; // Values of the message properties
msgprops.aStatus = aMsgStatus; // Error reports
// Validate the input strings.
if (lpwcsFormatName == NULL)
{
return MQ_ERROR_INVALID_PARAMETER;
}
// Open the queue with receive access.
hr = MQOpenQueue(
lpwcsFormatName, // Format name of the queue
MQ_RECEIVE_ACCESS, // Access mode
MQ_DENY_NONE, // Share mode
&hQueue // OUT: Queue handle
);
// Handle any error returned by MQOpenQueue.
if (FAILED(hr))
{
return hr;
}
while(1)
{
aMsgPropVar[0].ulVal = MQ_MAX_MSG_LABEL_LEN;
hr = MQReceiveMessage(
hQueue, // Queue handle
1000, // Max time to (msec) to receive the message
MQ_ACTION_RECEIVE, // Receive action
&msgprops, // Message property structure
NULL, // No OVERLAPPED structure
NULL, // No callback function
NULL, // No cursor handle
MQ_NO_TRANSACTION // Not in a transaction
);
if (hr == MQ_ERROR_BUFFER_OVERFLOW)
{
ulBufferSize = aMsgPropVar[2].ulVal * sizeof(UCHAR);
pucBodyBuffer = (UCHAR*)realloc(pucBodyBuffer, ulBufferSize);
if (pucBodyBuffer == NULL)
{
return MQ_ERROR_INSUFFICIENT_RESOURCES;
}
memset(pucBodyBuffer, 0, ulBufferSize);
aMsgPropVar[3].caub.pElems = (UCHAR*)pucBodyBuffer;
aMsgPropVar[3].caub.cElems = ulBufferSize;
continue;
}
if (FAILED(hr))
{
wprintf(L"No messages. Closing queue\n");
break;
}
// If the message contains a label, print it.
if (msgprops.aPropVar[0].ulVal == 0)
{
wprintf(L"Removed message from queue.\n");
}
else
{
wprintf(L"Removed message '%s' from queue.\n", (char *)wszLabelBuffer);
//cout << "Removed message ";
//wcout << wszLabelBuffer;
//cout << "from queue.\n";
}
// If the message body is a string, display it.
if (msgprops.aPropVar[4].ulVal == VT_BSTR)
{
wprintf(L"Body: %s", (WCHAR*)pucBodyBuffer);
wprintf(L"\n");
}
}
// Close the queue and free the memory allocated for the body buffer.
hr = MQCloseQueue(hQueue);
free(pucBodyBuffer);
return hr;
}
int main()
{
LPWSTR lpwcsFormatName = (LPWSTR)L"DIRECT=OS:wsm-ela-inc5\\private$\\soorya97";
_com_error err(ReadingDestQueue(lpwcsFormatName));
LPCTSTR errMsg = err.ErrorMessage();
wcout << errMsg << endl;
return 0;
}