GetProcAddress在Debug和Release之间不同地工作

Question

下面的代码在Debug模式下正常工作，但是在Release中，GetProcAddress似乎返回NULL，但是我无法调试发布模式代码，为什么它不适用于Release模式？

SetString("Library Init Error");
if (_DllHandle == NULL)
{
    _DllHandle = LoadLibrary("DogCheck.dll");
}
if (_CheckFunc == NULL && _DllHandle != NULL)
{
    _CheckFunc = (CheckTheLicense)GetProcAddress(_DllHandle, "CheckTheLicense");        
}
if (_CloseCheckFunc == NULL && _DllHandle != NULL)
{
    _CloseCheckFunc = (CloseCheckTheLicense)GetProcAddress(_DllHandle, "CloseCheckTheLicense");
}

if (_CheckFunc != NULL && _CloseCheckFunc != NULL)
{       
    PCHAR result = _CheckFunc();
    SetString(result);
    _CloseCheckFunc(result);
}
else
{
    if (_DllHandle == NULL)
    {
        SetString("DLL NULL");
    }
    else
    {
        if (_CheckFunc == NULL)
        {
            SetString("_CheckFunc NULL");
        }
    }
}

我也发现，下面的代码在Debug和Release模式下都有效：

HINSTANCE dllHandle = LoadLibrary("DogCheck.dll");
if (dllHandle != NULL)
{
    CheckTheLicense func = (CheckTheLicense)GetProcAddress(dllHandle, "CheckTheLicense");
    if (func != NULL)
    {
        PCHAR result = func();
        SetString(result);
        CloseCheckTheLicense funcClose = (CloseCheckTheLicense)GetProcAddress(dllHandle, "CloseCheckTheLicense");
        if (funcClose != NULL)
        {
            funcClose(result);
        }
    }
    FreeLibrary(dllHandle);
}