CODEWITHSUNDEEP
c++ms-accesscomdao
mellamokb
mellamokb

Reputation: 56779

use ACEDAO with Visual Studio c++ 2019

I want to do a simple performance experiment of using DAO with C++. I found this - https://learn.microsoft.com/en-us/previous-versions/office/developer/office-2007/cc811599(v=office.12)?redirectedfrom=MSDN - which seems to indicate I could do something like:

#import <C:\Program Files\Common Files\microsoft shared\OFFICE14\ACEDAO.DLL> rename( "EOF", "AdoNSEOF" )

_bstr_t bstrConnect = "C:\\temp\\test.accdb";
DAO::_DBEngine* pEngine = NULL;
CoInitialize(NULL);

HRESULT hr = CoCreateInstance(
    __uuidof(DAO::DBEngine),
    NULL,
    CLSCTX_INPROC_SERVER,
    IID_IDispatch,
    (LPVOID*)&pEngine);

if (SUCCEEDED(hr) && pEngine)
{
    // COM errors are handled by the C++ try/catch block.
    try
    {
        DAO::DatabasePtr pDbPtr = NULL;
        pDbPtr = pEngine->OpenDatabase(bstrConnect);
        ...

However it is failing on the call to OpenDatabase with this error:

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 am admittedly over my head at this point - I did one semester of c++ decades ago. Research seems to indicate this is a problem with the header files - but I didn't make any header files, Visual Studio auto-created them by simply doing a build with the #import line in place. Is it still possible to get something like this to work?

Upvotes: 0

Views: 42

Answers (0)

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