Unable to display the contents of queue in MSMQ via webapp.

Vikram N

13y3.9k

Hello,

Below is the code I have written to display the contents of an MSMQ queue. It works fine in case of winforms. But When i create a web application, Though the queue has some data, Nothing is displayed.

Can u help me..?

Thanks in advance.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Messaging;

using System.Text;

using System.Windows.Forms;

namespace MSMQWebService

{

///

/// Summary description for Service1

///

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.ComponentModel.ToolboxItem(false)]

public class Service1 : System.Web.Services.WebService

{

string QueueName = ".\\Private$\\q1";

[WebMethod]

public string DisplayMessage()

{

bool NoMessage = true;

MessageQueue Q1 = new MessageQueue(QueueName);

System.Messaging.Message[] AllMessages = Q1.GetAllMessages();

foreach (System.Messaging.Message theMessage in AllMessages)

{

NoMessage = false;

byte[] data = new byte[1024];

theMessage.BodyStream.Read(data, 0, 1024);

string strMessage = ASCIIEncoding.ASCII.GetString(data);

Console.WriteLine(strMessage);

}

if (NoMessage)

{

MessageBox.Show("Message Queue is Empty");

}

return "Success";

}

30 Replies

Know the answer? Post it — somebody with the same question will find it here.

13y ago
Accepted answer
I modified the code,
Add formatter and reader the body value from the message instance.

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]

public class Service1 : System.Web.Services.WebService
{
string QueueName = ".\\Private$\\q1";

[WebMethod]
public string DisplayMessage()
{
bool NoMessage = true;
MessageQueue Q1 = new MessageQueue(QueueName);
Q1.Formatter = new XmlMessageFormatter(new Type[]
{typeof(string)});
System.Messaging.Message[] AllMessages = Q1.GetAllMessages();
foreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
//byte[] data = new byte[1024];
//theMessage.BodyStream.Read(data, 0, 1024);
//string strMessage = ASCIIEncoding.ASCII.GetString(data);
string strMessage = theMessage.Body.ToString());

}

return "Success";
}
}

Please let me know, does it solves your problem or not.
0
Vikram N13y ago
Can you please tell me how?
0
13y ago
You can return string array instead of List.
0
Vikram N13y ago
Why can't we use List <> ?? Is it possible?
Since we are returning single value it is obvious that only one value is returned.
0
Vikram N13y ago
No use ., the error still persists.
0
13y ago
slight change in the code.
We're not assigned the values res.append(themessage.body.tostring());
0
Vikram N13y ago
Bro, thats the same code you said earlier.
0
13y ago
Try this.

foreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
//string strMessage = theMessage.Body.ToString();
res.Append(theMessage.Body.ToString());

//return strMessage.ToString();
}

if (NoMessage)
{
return "Empty Queue";
}
return res.ToString();
0

Vikram N13y ago

I did that actually, but getting error in this statement.
res.Append(theMessage.Body.ToString());

System.InvalidOperationException: Cannot deserialize the message passed as an argument. Cannot recognize the serialization format.    at System.Messaging.XmlMessageFormatter.Read(Message message)    at System.Messaging.Message.get_Body()    at MSMQWebService.Service1.DisplayMessage() in C:\Users\310128181\documents\visual studio 2010\Projects\MSMQWebService\MSMQWebService\Service1.asmx.cs:line 36

13y ago
The final return should be outside the loop.

Modified code

foreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
//string strMessage = theMessage.Body.ToString();
res = res.Append(theMessage.Body.ToString());

//return strMessage.ToString();
}

if (NoMessage)
{
return "Empty Queue";
}
return res.ToString();
0
Vikram N13y ago
namespace MSMQWebService
{
///
/// Summary description for Service1
///

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]

public class Service1 : System.Web.Services.WebService
{
string QueueName = ".\\Private$\\q1";

[WebMethod]
public string DisplayMessage()
{
bool NoMessage = true;
MessageQueue Q1 = new MessageQueue(QueueName);
Q1.Formatter = new XmlMessageFormatter(new Type[] { typeof(string) });
StringBuilder res = new StringBuilder();
System.Messaging.Message[] AllMessages = Q1.GetAllMessages();
foreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
//string strMessage = theMessage.Body.ToString();
res = res.Append(theMessage.Body.ToString());
return res.ToString();
//return strMessage.ToString();
}
if (NoMessage)
{
return "Empty Queue";
}
return "Success";
}

}
}
0
13y ago
Please share your code.
0
Vikram N13y ago
Yeah its fine.. But unable to display entire contents.
0
13y ago
Make sure, theMessage.Body().ToString() concatenation is correct.
0
Vikram N13y ago
Yeah. I am able to display only the last message in the queue.
0
13y ago
Still, do you have any issues?
0
Vikram N13y ago
Bro you there ?
0

Vikram N13y ago

getting error :(

System.InvalidOperationException: Cannot deserialize the message passed as an argument. Cannot recognize the serialization format.    at System.Messaging.XmlMessageFormatter.Read(Message message)    at System.Messaging.Message.get_Body()    at MSMQWebService.Service1.DisplayMessage() in C:\Users\310128181\documents\visual studio 2010\Projects\MSMQWebService\MSMQWebService\Service1.asmx.cs:line 42

In this line : result.Append(theMessage.Body.ToString());

13y ago
Try the below,

StringBuilder result = new StringBuilder();
oreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
//byte[] data = new byte[1024];
//theMessage.BodyStream.Read(data, 0, 1024);
//string strMessage = ASCIIEncoding.ASCII.GetString(data);
result.Append( theMessage.Body.ToString()));

}
return result.ToString();
0
Vikram N13y ago
Hello Murali :)
I am getting the output, but only the first message is getting displayed. Let me try to display all the messages.
Thanks a ton bro :)
0
13y ago
In which line you're getting this error?
0
Vikram N13y ago
strMessage has the contents of queue.
the error I am getting is

********
This page contains the following errors:
error on line 3 at column 37: xmlParseCharRef: invalid xmlChar value 0
Below is a rendering of the page up to the first error.
***************
But if I use Console.WriteLine(strMessage).
I will get the blank webpage as the out put.
0
13y ago
Are you getting any error?

Does the loop has records to process?

foreach (System.Messaging.Message theMessage in AllMessages)
{
}

If yes, what is the value that you're getting in the strMessage varaible?
0
Vikram N13y ago
Here is the web service code which reads the contents of the queue. can u please tell me how to display the contents?
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]

public class Service1 : System.Web.Services.WebService
{
string QueueName = ".\\Private$\\q1";

[WebMethod]
public string DisplayMessage()
{
bool NoMessage = true;
MessageQueue Q1 = new MessageQueue(QueueName);
System.Messaging.Message[] AllMessages = Q1.GetAllMessages();
foreach (System.Messaging.Message theMessage in AllMessages)
{
NoMessage = false;
byte[] data = new byte[1024];
theMessage.BodyStream.Read(data, 0, 1024);
string strMessage = ASCIIEncoding.ASCII.GetString(data);

}

return "Success";
}

}
0
Vikram N13y ago
Please Murali,
Kindly help me out :)
Thanks a lot for your help.
0
13y ago
Yes, I agree with you.
We will not worry about windows forms controls like messagebox.
Please create a new webservice to get the records from msmq and return it via web service.
I will help you to fix your problem.
0
Vikram N13y ago
Sorry Murali ., If I am getting it wrong.
yeah MessageBox.Show refers to winforms.(But that is not the point of concern now.)
But the "strMessage" I want to display is not working . Hope I have not used any winform attribute there.
Please correct me If I am wrong as I am new to this .
0
13y ago
Please look at the above code, it has references to windows.Forms, messagebox.show().
These are the references of windows form controls.
0
Vikram N13y ago
Hi Murali,
Ok I shall do it now.
But I have not mixed the above code with winform ryt?
0
13y ago
Hi Vikram,
Please do not mix windows form application and web service.
Create a separate web service application and call it from your web or windows application.
Definitely that should work.
Please let me know,if it is not working for you.
0

Unable to display the contents of queue in MSMQ via webapp.

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