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[DllImport("Kernel32")]
public static extern int GetProcAddress(int handle, String funcname);

[DllImport("Kernel32")]
public static extern int LoadLibrary(String funcname);

[DllImport("Kernel32")]
public static extern int FreeLibrary(int handle);

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typedef BOOL (__stdcall *PFOO)(Object &object, LPVOID lpReserved);

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HINSTANCE hInst = ::LoadLibraryW(dllFileName);

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PFOO foo = (PFOO)GetProcAddress(hInst,"foo");
if(foo == NULL)
{
    FreeLibrary(hInst);
    return false;
}

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BOOL bRet = foo(object,(LPVOID)NULL);

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FreeLibrary(hInst);

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public class DLLWrapper
{
    ///<summary>
    /// API LoadLibrary
    ///</summary>
    [DllImport("Kernel32")]
    public static extern int LoadLibrary(String funcname);

    ///<summary>
    /// API GetProcAddress
    ///</summary>
    [DllImport("Kernel32")]
    public static extern int GetProcAddress(int handle, String funcname);

    ///<summary>
    /// API FreeLibrary
    ///</summary>
 &


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