How can I use an activeX control (.ocx) in my MFC application?

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Hi,
I developed a MFC application to use an activeX control. The ocx file is used for barcode reader in a device.
when I add the ocx in my application, two different classes are added to my project.
Here is some codes in my .cpp file for class 1:

...
1) Barcode barcode;
2) barcode.Create(_T("STATIC"), _T("Hi"), WS_CHILD | WS_VISIBLE, CRect(0, 0, 20, 20), this, 1234);
...

When I run the application, an error comes up at line 2.

here is the detail of error:

First-chance exception at 0x7c812aeb in TestBCR.exe: Microsoft C++ exception: COleException at memory location 0x0012f0f0.

This error related to a function named AtlTraceVA.

C#

inline void __cdecl CTrace::TraceV(const char *pszFileName, int nLine,
        DWORD_PTR dwCategory, UINT nLevel, LPCSTR pszFmt, va_list args) const
    {
        AtlTraceVA(m_dwModule, pszFileName, nLine, dwCategory, nLevel, pszFmt, args);
    }

Can someone help me?

Thanks in advance
Ahrost

Posted 5-Jul-14 1:54am

Ahrost

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Comments

[no name] 5-Jul-14 8:02am

Did you initialize the COM library before trying to use your component?

Ahrost 5-Jul-14 8:15am

Dear Wes,
How can I do that?

Thanks

[no name] 5-Jul-14 8:25am

http://msdn.microsoft.com/en-us/library/windows/desktop/ms695279(v=vs.85).aspx

Ahrost 12-Jul-14 6:27am

Dear Wes,
Sorry to bother you.
Thanks for your help.
I could initialize the COM library with coInitializeEX() and solve the previous error but I got another error when I call my method in the class. here is the error :
OleInitialize returned scode = RPC_E_CHANGED_MODE ($80010106)

The codes that I use to call the method - ScanBarcode() - is something like this:

FASTBarcode fastbarcode;

bool res = fastbarcode.Create(_T("STATIC"), _T("Hi"), WS_CHILD | WS_VISIBLE, CRect(0, 0, 20, 20), this, 1234);
fastbarcode.ScanBarcode ();

void ScanBarcode()
{
InvokeHelper(0x1, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}

Many Thanks
Ahrost

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