Automation of already-running MS word

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I made the following code to take control of MS Word that is already running. But when I run the BOLD LINE of the following code, I get an error like this.

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.  This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

I have no idea what problem I made.

Please help me. Thanks.

What I have tried:

C++

USES_CONVERSION;

CLSID clsid;
HRESULT hr = CLSIDFromProgID(A2OLE("Word.Application"), &clsid);

LPDISPATCH pDispatch = NULL;
hr = GetActiveObject(clsid, NULL, (IUnknown**)&pDispatch);
if (hr == S_OK) {
    iWordApp.AttachDispatch(pDispatch);
}

iWordDoc = iWordApp.get_Documents();

Posted 15-Feb-22 19:45pm

Member 14877890

Updated 16-Feb-22 9:16am

Sean Ewington

v4

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4 solutions

Solution 1

The message says it all; your code and the code in Word use different calling conventions, which means the stack can get corrupted via a call between the two. You need to read the documentation for the Word Interop to check which it uses. See the explanations at Calling Conventions | Microsoft Docs[^].

Posted 15-Feb-22 21:38pm

Richard MacCutchan

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Member 14877890 16-Feb-22 20:48pm

Thank you for your comment.

Solution 2

I am not all versed in C++ or its functions. The little bit I read upon though makes me believe that your problem might be with your LPDISPATCH bit of code -

I presume that clsid has a value, not shown in your code above. LPDISPATCH however was given a null(nothing) value/attribute and you then make a call to this "nothing"...

See more HERE and HERE on this error - referring to stack calls.

Not sure if this will help, good luck.

Posted 15-Feb-22 21:41pm

Andre Oosthuizen

v2

Comments

Member 14877890 16-Feb-22 20:48pm

Thank you for your comment.

Solution 4

Take the error message serious: some code setting for your project are wrong. So check that the string define is producing correct version for the running app.

Your conversion macro may be wrong in your code. Read that discussion. Best is to create a real BSTR.

Even it isnt the solution: take care that you have ONLY ONE version of MS Word installed. Else deinstall ALL and re-install the target version.

Posted 16-Feb-22 6:59am

KarstenK

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Member 14877890 16-Feb-22 20:48pm

Thank you for your comment.

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_Asif_ · Accepted Answer · 2022-02-15T21:55:00

Although i have not tested above scenario, problem seems to be in the out parameter as GetActiveObject does not directly return IDispatch interface rather you need to query it from the IUknown interface.

Please see below an excerpt from Office Automation Using Visual C++[^]

C++

USES_CONVERSION;

CLSID clsid;
HRESULT hr = CLSIDFromProgID(A2OLE("Word.Application"), &clsid);
IUnknown *pUnk;

IDispatch *pDispatch;
hr = GetActiveObject(clsid, NULL, (IUnknown**)&pUnk;
if (hr == S_OK) {

	hr = pUnk->QueryInterface(IID_IDispatch, (void **)&pDispatch );
	ASSERT(!FAILED(hr));
    
	iWordApp.AttachDispatch(pDispatch);
}

iWordDoc = iWordApp.get_Documents();
pUnk->Release();

Automation of already-running MS word

4 solutions

Solution 1

Solution 3

Solution 2

Solution 4

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