Please review the following code, which is supposed to connect to Excel currently running:
#include <windows.h>
#include <oleacc.h>
#import "C:\Program Files (x86)\Common Files\microsoft shared\OFFICE14\MSO.DLL" no_implementation rename("RGB", "ExclRGB") rename("DocumentProperties", "ExclDocumentProperties") rename("SearchPath", "ExclSearchPath")
#import "C:\Program Files (x86)\Common Files\microsoft shared\VBA\VBA6\VBE6EXT.OLB" no_implementation
#import "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" rename("DialogBox", "ExclDialogBox") rename("RGB", "ExclRGB") rename("CopyFile", "ExclCopyFile") rename("ReplaceText", "ExclReplaceText")
BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM)
{
WCHAR szClassName[64];
if(GetClassNameW(hwnd, szClassName, 64))
{
if(_wcsicmp(szClassName, L"EXCEL7") == 0)
{
//Get AccessibleObject
Excel::Window* pWindow = NULL;
HRESULT hr = AccessibleObjectFromWindow(hwnd, OBJID_NATIVEOM, __uuidof(Excel::Window), (void**)&pWindow);
if(hr == S_OK)
{
//Excel object is now in pWindow pointer, from this you can obtain the document or application
Excel::_Application* pApp = NULL;
pApp = pWindow->GetApplication();
pWindow->Release();
}
return false; // Stops enumerating through children
}
}
return true;
}
int main( int argc, CHAR* argv[])
{
//The main window in Microsoft Excel has a class name of XLMAIN
HWND excelWindow = FindWindow(L"XLMAIN", NULL);
//Use the EnumChildWindows function to iterate through all child windows until we find _WwG
EnumChildWindows(excelWindow, (WNDENUMPROC) EnumChildProc, (LPARAM)1);
return 0;
}
The truth is Excel really running in current moment, but AccessibleObjectFromWindow returns E_FAIL.
I also tried to run this code in a loop and switch to Excel to it focused application. The same story, AccessibleObjectFromWindow returns an E_FAIL.
I am now searching in the internet for an answer but all found before gave me nothing. So if someone could provide an explanation it would be greatly appreciated.
Found an answer from some code example:
int main( int argc, CHAR* argv[])
{
CoInitialize( NULL );
...
The problem is resolved with CoInitialize(NULL) call before starting work with any other objects.