An ATL COM .exe server needs to be developed which dumps the messages send by a client application to the console

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An ATL COM .exe server needs to be developed which dumps the messages send by a client application to the console. ATL object inserted should have an interface method "DumpMessage" accepting a string argument.The client application can be an MFC dialog based application which accepts a string and sends the message to COM server on pressing a button.
This my code:
In Server

C++

[ id( 1 ), helpstring( "Chat" )] HRESULT DumpMessage([in]BSTR Message );
STDMETHODIMP CDumpMessage::DumpMessage( BSTR Message )
{
LPCTSTR lp = reinterpret_cast<LPCTSTR >(Message);
OutputDebugString(lp);

MessageBox( NULL, lp, NULL, NULL );
return S_OK;
}

In client

C++

if( FAILED( pDumpMessage ->DumpMessage((CComBSTR )m_csString)))

m_csString is Edit box variable

Please tell How to use console application in server

Posted 2-Jun-11 23:02pm

Sona from kerala

Updated 6-Jun-11 1:21am

v6

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Richard MacCutchan 3-Jun-11 6:14am

Have you included the correct header files? As you can see, the compiler cannot find a definition for CString.

4 solutions

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Resmi Anna · Answer 1 · 2011-06-03T00:21:00

Solution 1

use "class CString;" as a forward class declaration.
link error is because your ServerExe.exe is alreday running. stop that process.link error will be solved

Posted 3-Jun-11 0:21am

Resmi Anna

Comments

Resmi Anna 3-Jun-11 6:26am

I hope ur com server supports MFC

barneyman · Answer 2 · 2011-06-03T00:30:00

Solution 2

The clues are all there ...

you'll have to include the header for CString

#include <atlstr.h>

COM EXE Servers will generally run for 10 mins or so after they are last used, so you'll have to kill it with task manager

When you've fixed those, you're also going to have to add a return S_OK; from the DumpMessage method (yes, i know, technically, that's my fault)

I think you may be trying to run before you can walk here ...

Posted 3-Jun-11 0:30am

barneyman

Updated 3-Jun-11 0:31am

v2

Comments

Sona from kerala 3-Jun-11 6:38am

still
LINK : fatal error LNK1168: cannot open Debug/ServerExe.exe for writing
Error executing link.exe..

Resmi Anna 3-Jun-11 6:41am

kill ur ServerExe.exe from task manager process

Sona from kerala 3-Jun-11 7:01am

after adding that header file
fatal error C1083: Cannot open include file: 'atlstr.h': No such file or directory
Error executing cl.exe.

barneyman 3-Jun-11 7:13am

oops - just noticed you're using VC6 ... CString is in MFC in that version; from memory adding MFC support was problematic (http://support.microsoft.com/kb/173974)

You may have more luck looking at this http://www.codeproject.com/KB/string/bstrsproject1.aspx

Resmi Anna · Answer 3 · 2011-06-03T01:25:00

Solution 3

better u use LPCTSTR instead of CString. This seems to be better.

Posted 3-Jun-11 1:25am

Resmi Anna

Comments

Sona from kerala 3-Jun-11 7:38am

STDMETHODIMP CDumpMessage::DumpMessage( BSTR Message )
{
LPCTSTR msg(Message);
return S_OK;
}
1 error
error C2440: 'initializing' : cannot convert from 'unsigned short *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Resmi Anna · Answer 4 · 2011-06-03T01:47:00

Solution 4

you need to convert ur BSTR to LPCTSTR.
if your application doesnt support UNICODE do as below

[ id( 1 ), helpstring( "Chat" )] HRESULT DumpMessage([in]BSTR Message );
STDMETHODIMP CDumpMessage::DumpMessage( BSTR Message )
{
LPCTSTR lp = reinterpret_cast<lpctstr>(Message);
OutputDebugString(lp);
}</lpctstr>

Posted 3-Jun-11 1:47am

Resmi Anna

Comments

Sona from kerala 3-Jun-11 7:54am

thanks

Resmi Anna 3-Jun-11 8:06am

pls mark it as solved if it is fine. why you have updated the qstn?

Sona from kerala 6-Jun-11 0:23am

strings are not displyed in server.why?

Resmi Anna 6-Jun-11 1:04am

you are saying that is not displayed in Debug Viewer??

Sona from kerala 6-Jun-11 1:06am

ya

Resmi Anna 6-Jun-11 1:13am

why dont you try debugging the function DumpMessage() in server.
just check the input param value is correct 'BSTR Message'. if so there may be some mistake with conversion.