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Hi,
I've had to dabble in COM (C++) for the current application my company is developing. It's a big application, that has a lot of debug output, and I thought it would be nice for my fellow developers to be able to double click on file/line references in the debug output pane of the application, and be taken into visual studio, where the file would open at the appropriate line (much like double clicking on errors and warnings in visual studio itself).
ShellExecuteEx or DDE can be used to open the file, but the only way I could find to go to the line is to resort to COM: get an IApplication pointer, get the active document, get the text selection in the active document, then goto the line. This works fine, but whenever I get the IApplication pointer, using CoCreateInstance, a new visual studio fires up, even if there's one already available.
I have two questions:
1) Is there an easier way to do this?
2) If there isn't, how can I stop CoCreateInstance from creating new visual studios every time?
Many thanks in advance...
Andy.
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How embarrassing, replying to my own posts. However, I have found a solution (probably wrong, but at least it works). I thought I'd post it here incase anyone else had similar novice difficulties.
The following code checks to see if there's an active visual studio running. If there isn't, then one is created using CoCreateInstance. Next, the specified file is opened, then the specified line is visited.
(note _HRESULT_SUCCESS is just a wee macro I use for testing HRESULT values. Also, you need to include atlbase.h, initguid.h,objmodel/appguid.h,objmodel/appauto.h,objmodel/textauto.h and objmodel/testguid.h).
Modification: Curses; had to remove <code>...</code> tags, because the template instanciations of CComPtr and CComQIPtr were not appearing 
void _OpenFileAtLineInVS(const TCHAR* pFilename,const unsigned int Line)
{
CComPtr<IApplication> pApp = 0;
CComPtr<IUnknown> pUnkApp = 0;
if (_HRESULT_SUCCESS(GetActiveObject(CLSID_Application,0,&pUnkApp)))
{
_HRESULT_SUCCESS(pUnkApp->QueryInterface(IID_IApplication,(void**)&pApp));
}
if (pApp == 0)
{
_HRESULT_SUCCESS(CoCreateInstance(CLSID_Application,0,CLSCTX_SERVER,IID_IApplication,(void**)&pApp));
}
if (pApp != 0)
{
// Make sure visual studio is active and visible
pApp->put_Visible(VARIANT_TRUE);
pApp->put_Active(VARIANT_TRUE);
CComPtr<IDispatch> pDisp = NULL;
// Get the documents interface
pApp->get_Documents(&pDisp);
CComQIPtr<IDocuments, &IID_IDocuments> pDocs(pDisp);
pDisp = 0;
// Open the specified file
pDocs->Open(CComBSTR(pFilename),CComVariant("Auto"),CComVariant("False"),&pDisp);
// Get the active document (the newly opened file)
pDisp = 0;
pApp->get_ActiveDocument(&pDisp);
CComQIPtr<ITextDocument,&IID_ITextDocument> pActiveDoc(pDisp);
pDisp = 0;
pActiveDoc->get_Selection(&pDisp);
// Get the text selection object from the active document, and go to the appropriate line
CComQIPtr<ITextSelection,&IID_ITextSelection>(pDisp)->GoToLine(Line,CComVariant(dsMove));
}
}
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Hi,
I'm witting an Outlook plugin in VC++, using ATL.
When a button in outlook is pressed, my plug-in will create a new mail, or reply to the selected one, or forward it. Now, the problem is that after generating this new window(for new mail, reply or fwd), when I close Outlook, another instance of Outlook remains somewhere running (I see it in Task Manager, and I have to close it form there). Any ideea what do wrong? Here is part of my code from the reply command:
for(int i=1; i<=lItemCount; i++)
{
CComPtr<idispatch> spDisp;
CComVariant vt(i); //get selected item number i
hr = spSelection->Item(vt, &spDisp);
if(FAILED(hr))
return;
CComQIPtr< Outlook::_MailItem > spMailItem(spDisp);
CComPtr<outlook::_mailitem> spMailItem2;
if(FAILED(hr))
return;
if(spMailItem!=NULL)
{
spMailItem->Reply(&spMailItem2);
BSTR subj;
spMailItem->get_Subject(&subj);
CString str = "Re:";
str += W2T(subj);
spMailItem2->put_Subject(T2W(str));
BSTR htmlBody;
spMailItem->get_HTMLBody(&htmlBody);
str = ReadHTMLIntoString((CString)W2T(bstrMSname)); //insert the Reply .html
str += "
Original text:
"; //something between our text and the original text
str += W2T(htmlBody);
htmlBody = T2W(str);
spMailItem2->put_HTMLBody(htmlBody);
spMailItem2->Display();
}
spMailItem2.Detach();
spMailItem.Detach();
spDisp.Detach();
}
I think something should be done with spMailItem2, but I just don't know what.
I would really appreciate any help.
Thanks,
Doru K
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dorutzu wrote:
spMailItem2.Detach();
spMailItem.Detach();
spDisp.Detach();
Whoops!
I think you were trying to get the smart pointers to clean up, but they'll do that by themselves. The Detach method is a way to get the smart pointer to stop tracking the underlying pointer, but it does not call Release.
Either call Release, or don't do anything.
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Thanks!
This was the problem indeed! I got, eventually, to the answer by my self, but thanks for your help anyway. Unfortunately, I haven't found too much info on the net on this issue, and I used Detach just for the sake of cleaning up 
Thanks again,
Doru K
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I'm creating a COM Dll which calls a modeless dialog box inside a thread. I notice it fails on the create function. Its seems it can't find the resource ID.
Sample code provided.
DWORD WINAPI CComDll::StartThread(PVOID param)
{
CDialog* dlg = new CDialog();
dlg->Create(IDD_DIALOG);
dlg->ShowWindow(SW_SHOW);
}
Thanks
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CDialog is an MFC class. Is MFC support included in your .dll? It sounds like it is not. So when the Create method tries to locate IDD_DIALOG, it cannot use the MFC global AfxResourceHandle.
If you are building the COM .dll using the VS wizard and selecting ATL, be sure to check the Include MFC support option. If it is an ATL .dll and you do not want to recreate the project, look up Howto add MFC support to ATL in MSDN for instructions.
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3142.1
Hi everybody!
I have a problem with COM technology. Here it is:
I have two applications (let's say application A & B, c++ executable applications), and I need to run some methods of B application from A application. This is what I was succesfull at.
Here is the real problem:
I need to create some objects (dynamically) in my A application, (I was trying to inherite them from IUnknown) , and send them to application B (probably as an IUnknown), so I can use them as normal objects of the B application.
Can anybody help me with this?
Here is what I did:
I created client (A) as an client, and an B app. as an server. I have created some methods in B to see if it works (it worked), then I have created an object (X) in A app (inherited from IUnknown), and method in B app, that has an parameter LPUNKNOWN. In A app. I run this function of B's app, and I put there this X object as an parameter FunctionName((LPUNKNOWN)X);
The B app has recieved this X pointer as an IUnknown, and here comes the problem: in B app, I tried to get different interface of B object by QueryInterface function , but it returned me NULL!!! That's the problem..
Does anyone have some experience with it?
Ceno
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Hi,
i'm using Acrobat Distiller through OLE/COM Automation as suggested in the Acrobat Distiller API Reference Guide (tech. note #5158, version 5.0). It seems to work well on Windows 2000, but i'm having COM security issues (i think) on Windows XP.
Here is a simple test case:
[1] Run the DistillerCtrl sample application provided with the Adobe Acrobat SDK v.5.0 with a user of the Administrators group. It works. 
[2] Run the DistillerCtrl sample application provided with the Adobe Acrobat SDK v.5.0 with another user not part of the Administrators group. It fails. 
I keep having the 0x80080005 - Server execution failed error.
DCOM configuration is set to defaults for the AcroDistX object:
Authentification Level = Default
Launch and Access Permissions = Use Default
Identity = The launching user
The client and the server both run on the same machine running Windows XP (with service pack 1).
The test only fails on Windows XP, i have no problem running it on Windows 2000. What am i missing? 
HooK
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Are you using CoInitializeSecurity, and if so, how?
Steve S
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No i'm not using CoInitializeSecurity.
HooK
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Hi there,
I am implementing connection points and i would like to know one thing here that is it possible to do custom marshalling with connection points.
My outgoing interface is something like this,
interface _INBDatabaseHandlerEvents
{
[helpstring("method RecieveBackupInfo")] HRESULT RecieveBackupInfo([in] BackUpInfo* bakupinfo);
}
where backupinfo is my own defined structue using multiple data types and they may not be automation compliant.
i have manually edited the coclass to
[default, source] interface _INBDatabaseHandlerEvents;
dispinterface removed and my object derives from IUnknown now.
QUESTION:
At the client side what should i do include .tlb or .h and .c for interfaces uuid.
And if provide only typelib information would it work if i have registered the proxy stub as well.
And i am just using the typelib to help the coz of not using .c and .h files from server
QUESTION:
how can i include .c file in different cpp for using cocreateinstance. It is not possible but i need the uuids for instantiating the objects.
Should i use typelib for custom interfaces with custom defined parameters it would make a difference or not.
Thanks in advance.
I'm looking forward for an urgent reply.
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Hi,
I am working on a utility which act as an IE extension. I want to add a new 'protocol' (default IE protocols: http:, ftp:, ms-its: ..., I need to impelement my own, e.g. makecall:, goto to IE, I rem that many years ago I browse MSDN, it may called "pluggable protocol xxx", but I can't find anything in MSDN anymore.
Can any one give me a tip? many thanks.
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I think that you need to add something like this to registry:
<br />
HKEY_CLASSES_ROOT\makecall\@ = URL: makecall Protocol<br />
HKEY_CLASSES_ROOT\makecall\URL Protocol = ""<br />
HKEY_CLASSES_ROOT\makecall\DefaultIcon\@ = C:\YourIcon.ico<br />
HKEY_CLASSES_ROOT\makecall\shell\@ = open<br />
HKEY_CLASSES_ROOT\makecall\shell\open\command\@ = "C:\YourApp.exe" "%1"<br />
i'm only pointer to myself
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I create one remote com object - 'execel.exe' to build
execel report. but I want to know the ProcessID of this remote object. Who can help me ?
best regards!
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just add this method
GetServerId([out] DWORD* dwProcessId);
GetCurrentProcessId() look in msdn and there you are.
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Hi every body
I'm just a beginner in COM, and as a beginner, i'm starting with sample codes like those of MSDN.
When running this piece of code:
_Application app;
if ( !app.CreateDispatch("Excel") )
AfxMessageBox("Could not start excel);
else
{
app.SetVisible(TRUE);
AfxMessageBox("Excel is running.");
}
i got an unhandled exception:
unhandled exception in XXX.exe(MFC042D.DLL):OxC000005:access violation
when app.CreateDispatch(...) is called.
Is there any body who know what could be wrong ?
Note: I'm using VC 6.0, with Office 97, and i already check for the good excel library.
Thanks in advance
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Shouldn't that be
CreateDispatch("Excel.Application")
Steve S
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You're rigth. It was just a mistake when I wrote my message. It should be Excel.Application. Sorry.
My PB remains.
Thanks
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Did u initialize COM?
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Yes I did ...
if you was thinking at
<br />
BOOL CAutoProjectApp::InitInstance()<br />
{<br />
if ( !AfxOleInit())<br />
{<br />
AfxMessageBox("Could not initialize COMM dll");<br />
return FALSE;<br />
}<br />
......<br />
<br />
... no problem with this part of code.
Thanks for your answer
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I have been thinking about this problem for days, and am unsure on the best way to proceed as I dont have enough experience. My problem is that I have a IDispatch server component sitting on a remote computer, running with DCOM, to which I need to send a very large (from 30KB upwards to about 2MB) string. Currently I have implemented this by calling my server method HRESULT ReceiveText( BSTR ) but I am concerned that this is not particularly efficient.
Alternatively I can save the text to a networked shared file which the remote server could read, but that not be a good solution for when the remote server is too remote. However the advantage of using a file is that I can zip it, which reduces the text to approx 6-8% in size.
My question is therefore what is the best way of sending/receiving text using DCOM and does anyone know of any components that I could use to zip/unzip the text before/after sending? I will be grateful for any comments and suggestions. Thank you.
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In terms of archiving, check out CodeProject code section.
As for data sharing, one solution is TCP/IP.
Kuphryn
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If you have to use IDispatch, then you could take advantage of the fact that a BSTR isn't necessarily a string, but is a byte counted block of words.
That would let you use zlib to compress the data in the sender, and to uncompress it in the receiver.
Steve S
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Thanks to Kuphryn and Steve for both the replys. I intend to zip/unzip the string as suggested in order to save transmission time, and am incorporating some of the info from some of the helpful articles in CodeProject. I would also like to consider TCP/IP as a solution but that will be some steep learning so I will delay that for now. Thanks again.
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