COM for eMbedded Visual C++ 3.0 ( Under Windows CE )
To Run this application we must have installed eMbedded Visual C++ 3.0
The Generation of the COM Server and the COM Client in embedded Visual C++ 3.0 is somewhat different than the Microsoft Visual C++ 6.0. It leads an error in the COM server while running the client. This Article resolves the error and achieves the Server functionality.
Generate the Server( CEServer.dll)
Generate the work space for the Server.
Step: 1
Step: 2
click finish.
Step 3:
Select Simple Object for the COM. Because we need simple COM object that supports in-proc server.
Click Next to select the interface name
Type Process in the field for short name. It automatically generates the Class name, Interface name etc as it was in Visual C++ 6.0.
Press OK. Now we have given the parameters how the COM object should be.
Build the Server dll. It builds successfully and does not give any error. We have generated the COM Server.
Generate the Client( CEClinet.exe)
Step 1:
Let the Client be a dialog based application,
The Design of the dialog is as shown in the figure.
Step 2:
Add the Server dll file path in stdafx.h file after #endif
#import "C:\\Program Files\\Windows CE Tools\\wce211\\MS HPC Pro \\emulation\\hpcpro\\windows\\CEServer.dll" no_namespace
Note: In my system, the Windows CE Tools directory is in the Program Files. Try to modify according to your path.
Step 3:
Declare the pointer for the Process interface in the header file CEClientDlg.h,
CLSID clsid;
IProcess *m_pProcess;
Add the following lines in the OnInitDialog in CEClientDlg.cpp,
BOOL CCEClientDlg::OnInitDialog() { CDialog::OnInitDialog(); // TODO: Add extra initialization here HRESULT hr; hr = CLSIDFromProgID(OLESTR("CEServer.Process.1"),&clsid); if(FAILED(hr)) MessageBox(NULL,_T("Prog id failed"), MB_OK); CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, __uuidof(IProcess), (void**)&m_pProcess); if(m_pProcess == NULL) MessageBox(NULL,_T("interface pointer failed"), MB_OK); return TRUE; // return TRUE unless you set the // focus to a control }
Step 4:
Then call the function from the interface while the user clicks the button,void CCEClientDlg::OnCallServer() { m_pProcess->Show(); }
Compile the Client Project. You will get some error in the server in the CEServer.tli file.
That is, error C2065: '_com_issue_errorex' : undeclared identifier.
This is the main difference while creating the COM in eMbedded Visual C++ 3.0. This error does not come in Microsoft Visual C++ 6.0. This article is mainly dedicated to solve this error and run the COM Client Successfully.
What to be done to resolve this problem
(The modification is in the CEServer.dll)
Add the definition or override the existing function.
Step 1:
Goto CEServer.idl file,
interface IProcess : IDispatch
{
//Show function
//Add this function declaration here
[id(2), helpstring("method _com_issue_errorex")] HRESULT
_com_issue_errorex(HRESULT _hr1,
IUnknown *pthis1,
const GUID refiid1);
};
Step 2:
Goto Process.h file,
Add the declaration ,
STDMETHOD(_com_issue_errorex)(HRESULT _hr1, IUnknown *pthis1, const GUID refiid1);
Step 3:
Goto Process.cpp file,
Add the definition,
STDMETHODIMP CProcess::_com_issue_errorex(HRESULT _hr1,
IUnknown *pthis1,
const GUID refiid1)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
// TODO: Add your implementation code here
return S_OK;
}
Rebuild all.
Again come to the COM Client and rebuild the client application.
Downloads
Download demo project (COM CE Server) - 30 KbDownload demo project (COM CE Client) - 40 Kb
Comments
How to solve OCX inclusion problem in WinCE Emulator
Posted by Legacy on 06/06/2003 12:00amOriginally posted by: Gowrisankar
with Events?
Posted by Legacy on 01/09/2003 12:00amOriginally posted by: Ellis LI
I can't create a ATl object with events. Can help?
ReplyHow to make COM server run in Emulator?
Posted by Legacy on 05/08/2002 12:00amOriginally posted by: HuuQuynh
Dir B. Manivannan,
I am a beginner. So I do not know how to make a DLL, as COM server, run in Emulator! I think I must modify some Registry keys. But I do not know how. I have a example in shell programming, writing a IME for Palm size PC or Pocket PC, compiled by EVC 3.0, compiled complete, download complete, and EVC registered DLL completed too! But how to make DLL (IME) run in emulator?
Thank you very much!
Best regards,
ReplyHuuQuynh
How to register the COM dll on PPC?
Posted by Legacy on 04/12/2002 12:00amOriginally posted by: BJ Lee
On desktop and HPC, we just use regsvr32.exe for registering COM dlls.
ReplyBut we don't have that on PPC, how to register ?
Query --How to call API calls in X86 target
Posted by Legacy on 02/11/2002 12:00amOriginally posted by: Maria Jothi
Hello Sir,
I want to build an application and test it in the x86 target.
I added an API call for my requirement.
If i include a API call Hwxconfig and itz neccessary header file in as :
STDMETHODIMP CProcess::Show()
{
// TODO: Add your implementation code here
MessageBox(NULL,_T("From Server"),_T("COM Server"),MB_OK);
HwxConfig();
return S_OK;
}
I'm getting the following error ::::
Linking...
Process.obj : error LNK2019: unresolved external symbol _HwxConfig referenced in function "public: virtual long __cdecl CProcess::Show(void)" (?Show@CProcess@@UAAJXZ)
X86Dbg/CEServer.dll : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
How to avoid this error ??
Awaiting for the favourable reply.
Thanks
Maria
same err
Posted by minaldahiya on 04/12/2004 10:15pmI am getting the same error. Could you solve this issue or not?
ReplyServer dll file path-> How to make it default for all machines
Posted by Legacy on 02/08/2002 12:00amOriginally posted by: Maria Jothi
Hello sir,
How to specify the server dll file path in stdafx.h file.
#import "\\windows\\CEServer.dll" no_namespace
instead of
#import "C:\\Program Files\\Windows CE Tools\\wce211\\MS HPC Pro\\emulation\\hpcpro\\windows\\CEServer.dll" no_namespace
so the coding line will be default for all machines irrespective of the installation directory.
#import "\\windows\\CEServer.dll" no_namespace is giving error . How to modify it as per the requirement ??
Thanks
ReplyMaria
Persistent Storage in Windows CE
Posted by Legacy on 12/21/2001 12:00amOriginally posted by: S.P.Raj
Pocket Internet Explorer
Posted by Legacy on 12/07/2001 12:00amOriginally posted by: Bruno
Hello,
thank you for your article. I just have a question. I would like to control Pocket Internet Explorer through COM.
Is it possible???
If yes, How and Where can i get source code?
Thank you in advance, it's important
Bruno
Reply