Word Automation using IDispatch

S

steve.thresher

I am attempting to automate Word2003 from a C++ program using IDispatch
interfaces. I am having a problem where the output window in Visual Studio
..NET 2003 shows the following errors when CoUninitialize() is called:

First-chance exception at 0x77e73887 in autoword.exe: 0x800706BE: The remote
procedure call failed.
First-chance exception at 0x77e73887 in autoword.exe: 0x800706BA: The RPC
server is unavailable.

The following console program is an unmodified sample taken from MSDN that
also shows the same problem.


#include <ole2.h>
#include <stdio.h>

int main(int argc, char* argv[])
{

// *************** Declare Some Variables ********************

// Variables that will be used and re-used in our calls
DISPPARAMS dpNoArgs = {NULL, NULL, 0, 0};
VARIANT vResult;
OLECHAR FAR* szFunction;
BSTR bstrTemp;

// IDispatch pointers for Word's objects
IDispatch* pDispDocs; //Documents collection
IDispatch* pDispSel; //Selection object
IDispatch* pDispActiveDoc; //ActiveDocument object

// DISPIDs
DISPID dispid_Docs; //Documents property of Application
//object
DISPID dispid_DocsAdd; //Add method of Documents collection
//object
DISPID dispid_Sel; //Selection property of Application
//object
DISPID dispid_TypeText; //TypeText method of Selection object
DISPID dispid_TypePara; //TypeParagraph method of Selection
//object
DISPID dispid_ActiveDoc; //ActiveDocument property of
//Application object
DISPID dispid_SaveAs; //SaveAs method of the Document object
DISPID dispid_Quit; //Quit method of the Application
//object

// ******************** Start Automation ***********************

//Initialize the COM libraries
::CoInitialize(NULL);

// Create an instance of the Word application and obtain the
// pointer to the application's IDispatch interface.
CLSID clsid;
CLSIDFromProgID(L"Word.Application", &clsid);

IUnknown* pUnk;
HRESULT hr = ::CoCreateInstance( clsid, NULL,
CLSCTX_SERVER,IID_IUnknown, (void**) &pUnk);
IDispatch* pDispApp;
hr = pUnk->QueryInterface(IID_IDispatch, (void**)&pDispApp);

// Get IDispatch* for the Documents collection object
szFunction = OLESTR("Documents");

hr = pDispApp->GetIDsOfNames (IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_Docs);

hr = pDispApp->Invoke (dispid_Docs, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_PROPERTYGET, &dpNoArgs, &vResult, NULL, NULL);

pDispDocs = vResult.pdispVal;

// Invoke the Add method on the Documents collection object
// to create a new document in Word
// Note that the Add method can take up to 3 arguments, all of
// which are optional. You are not passing it any so you are
// using an empty DISPPARAMS structure
szFunction = OLESTR("Add");
hr = pDispDocs->GetIDsOfNames(IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_DocsAdd);

hr = pDispDocs->Invoke(dispid_DocsAdd, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpNoArgs, &vResult, NULL, NULL);

// Get IDispatch* for the Selection object
szFunction = OLESTR("Selection");
hr = pDispApp->GetIDsOfNames (IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_Sel);

hr = pDispApp->Invoke (dispid_Sel, IID_NULL,
LOCALE_USER_DEFAULT,DISPATCH_PROPERTYGET, &dpNoArgs, &vResult, NULL, NULL);

pDispSel = vResult.pdispVal;


// Get the DISPIDs of the TypeText and TypeParagraph methods of
// the Selection object. You'll use these DISPIDs multiple
// times.
szFunction = OLESTR("TypeText");
hr = pDispSel->GetIDsOfNames(IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_TypeText);

szFunction = OLESTR("TypeParagraph");
hr = pDispSel->GetIDsOfNames(IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_TypePara);

// The TypeText method has and requires only one argument, a
// string, so set up the DISPPARAMS accordingly
VARIANT vArgsTypeText[1];
DISPPARAMS dpTypeText;

bstrTemp = ::SysAllocString(OLESTR("One"));
vArgsTypeText [0].vt = VT_BSTR;
vArgsTypeText [0].bstrVal = bstrTemp;
dpTypeText.cArgs = 1;
dpTypeText.cNamedArgs = 0;
dpTypeText.rgvarg = vArgsTypeText;

//Invoke the first TypeText and TypeParagraph pair
hr = pDispSel->Invoke (dispid_TypeText, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpTypeText, NULL, NULL, NULL);
hr = pDispSel->Invoke (dispid_TypePara, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpNoArgs, NULL, NULL, NULL);
::SysFreeString(bstrTemp);

//Invoke the second TypeText and TypeParagraph pair
bstrTemp = ::SysAllocString(OLESTR("Two"));
hr = pDispSel->Invoke (dispid_TypeText, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpTypeText, NULL, NULL, NULL);
hr = pDispSel->Invoke (dispid_TypePara, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpNoArgs, NULL, NULL, NULL);
::SysFreeString(bstrTemp);

//Invoke the third TypeText and TypeParagraph pair
bstrTemp = ::SysAllocString(OLESTR("Three"));
hr = pDispSel->Invoke (dispid_TypeText, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpTypeText, NULL, NULL, NULL);
hr = pDispSel->Invoke (dispid_TypePara, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &dpNoArgs, NULL, NULL, NULL);
::SysFreeString(bstrTemp);

// Get IDispatch* for the ActiveDocument object
szFunction = OLESTR("ActiveDocument");
hr = pDispApp->GetIDsOfNames (IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_ActiveDoc);
hr = pDispApp->Invoke (dispid_ActiveDoc, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_PROPERTYGET, &dpNoArgs, &vResult, NULL, NULL);
pDispActiveDoc = vResult.pdispVal;

//Set up the DISPPARAMS for the SaveAs method (11 arguments)
VARIANT vArgsSaveAs[11];
DISPPARAMS dpSaveAs;
dpSaveAs.cArgs = 11;
dpSaveAs.cNamedArgs = 0;
dpSaveAs.rgvarg = vArgsSaveAs;

BSTR bstrEmptyString;
bstrEmptyString = ::SysAllocString(OLESTR(""));

VARIANT vFalse;
vFalse.vt = VT_BOOL;
vFalse.boolVal = FALSE;

bstrTemp = ::SysAllocString(OLESTR("c:\\doc1.doc"));
vArgsSaveAs[10].vt = VT_BSTR;
vArgsSaveAs[10].bstrVal = bstrTemp; //Filename
vArgsSaveAs[9].vt = VT_I4;
vArgsSaveAs[9].lVal = 0; //FileFormat
vArgsSaveAs[8] = vFalse; //LockComments
vArgsSaveAs[7].vt = VT_BSTR;
vArgsSaveAs[7].bstrVal = bstrEmptyString; //Password
vArgsSaveAs[6].vt = VT_BOOL;
vArgsSaveAs[6].boolVal = TRUE; //AddToRecentFiles
vArgsSaveAs[5].vt = VT_BSTR;
vArgsSaveAs[5].bstrVal = bstrEmptyString; //WritePassword
vArgsSaveAs[4] = vFalse; //ReadOnlyRecommended
vArgsSaveAs[3] = vFalse; //EmbedTrueTypeFonts
vArgsSaveAs[2] = vFalse; //SaveNativePictureFormat
vArgsSaveAs[1] = vFalse; //SaveFormsData
vArgsSaveAs[0] = vFalse; //SaveAsOCELetter


//Invoke the SaveAs method
szFunction = OLESTR("SaveAs");
hr = pDispActiveDoc->GetIDsOfNames(IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_SaveAs);
hr = pDispActiveDoc->Invoke(dispid_SaveAs, IID_NULL,
LOCALE_USER_DEFAULT, DISPATCH_METHOD, &dpSaveAs, NULL, NULL, NULL);
::SysFreeString(bstrEmptyString);

//Invoke the Quit method
szFunction = OLESTR("Quit");
hr = pDispApp->GetIDsOfNames(IID_NULL, &szFunction, 1,
LOCALE_USER_DEFAULT, &dispid_Quit);
hr = pDispApp->Invoke (dispid_Quit, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD,&dpNoArgs, NULL, NULL, NULL);

//Clean-up
::SysFreeString(bstrTemp);
pDispActiveDoc->Release();
pDispSel->Release();
pDispDocs->Release();
pDispApp->Release();
pUnk->Release();

::CoUninitialize();

return 0;

}

Can anybody suggest what the problem is?
 

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