使用CoCreateInstance從C++調用COMVisible VB.Net dll

在我上一個問題以來的一些進度測量中，我得到了以下項目進行編譯。它基於https://stackoverflow.com/a/10949784/846550 使用CoCreateInstance從C++調用COMVisible VB.Net dll

但是在運行時對CoCreateInstance的調用失敗。 HRESULT是0x80131522 - 谷歌這個和大多數命中似乎涉及SQL服務器，我不使用。

C++代碼，非託管

#include <iostream> 
#include <atlbase.h> 
#import "..\ClassLibrary1\bin\debug\ClassLibrary1.tlb" no_namespace 

using namespace std; 

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    ATLENSURE_SUCCEEDED(CoInitialize(NULL)); 

    CLSID clsid; 
    _ComClass1 *t; 
    ATLENSURE_SUCCEEDED(::CoInitialize(NULL)); 
    ATLENSURE_SUCCEEDED(CLSIDFromProgID(OLESTR("ClassLibrary1.ComClass1"), &clsid)); 

    HRESULT hr = CoCreateInstance(clsid,NULL,CLSCTX_INPROC_SERVER, 
            __uuidof(_ComClass1),(LPVOID*) &t); 
    ATLENSURE_SUCCEEDED(hr); 

    ATLENSURE_SUCCEEDED(t->showform()); 
    ATLENSURE_SUCCEEDED(t->increment()); 

    CoUninitialize(); 
    return 0; 
}

這裏是很好的措施的DLL代碼 - 幾乎完全自動生成作爲在VB一個COM DLL類。（DLL顯示爲使用oleview註冊）。

<ComClass(ComClass1.ClassId, ComClass1.InterfaceId, ComClass1.EventsId)> _ 
Public Class ComClass1 

#Region "COM GUIDs" 
    ' These GUIDs provide the COM identity for this class 
    ' and its COM interfaces. If you change them, existing 
    ' clients will no longer be able to access the class. 
    Public Const ClassId As String = "46783a4a-5ca9-4930-addb-cde91a377c02" 
    Public Const InterfaceId As String = "e2ad7298-7339-45fb-aad1-cb82188bf067" 
    Public Const EventsId As String = "b7e10cdf-dc2a-4052-9b0f-f6f9d5a1f0ac" 
#End Region 

    ' A creatable COM class must have a Public Sub New() 
    ' with no parameters, otherwise, the class will not be 
    ' registered in the COM registry and cannot be created 
    ' via CreateObject. 
    Public Sub New() 
     MyBase.New() 
    End Sub 


    Private f1 As Form1 

    Public Sub showform() 
     f1 = New Form1() 
     f1.Show() 
    End Sub 

    Public Sub increment() 
     f1.ProgressBar1.Increment(5) 
    End Sub 

End Class

來源

2012-06-22 Sideshow Bob