我在CLSID\{clsid}
中使用WOW64版本注册了我的32位进程内组件(仅MyComponent.1
,MyComponent
和HKEY_CURRENT_USER\Software\Classes
键及其子键) REGSVR32。当我尝试使用来自我的32位进程的CoCreateInstance()创建它时,它失败了REGDB_E_CLASSNOTREG。
但是当我从32位进程手动检索HKEY_CLASSES_ROOT\CLSID\{clsid}\InprocServer32
并手动加载DLL以调用DllGetClassObject()时,它会成功!
我不明白。什么是CoCreateInstance()和CoGetClassObject()这样做,当我的代码执行他们应该做的工作时,它们会因REGDB_E_CLASSNOTREG而失败?
//This code fails with REGDB_E_CLASSNOTREG
STDMETHODIMP CreateTestCOM1(ITestCOM ** ppTestCOM, void **ppContext)
{
assert(ppContext!=NULL);
if(ppContext==NULL)
return E_INVALIDARG;
*ppContext = NULL;
HRESULT hr = E_NOTIMPL;
//I tried both CoCreateInstance and CoGetClassObject, they both fail.
#if 0
hr = CoCreateInstance(CLSID_TestCOM, NULL, CLSCTX_INPROC_SERVER, IID_ITestCOM, reinterpret_cast< void ** >(ppTestCOM));
#else
IClassFactory *pFactory = NULL;
hr = CoGetClassObject(CLSID_TestCOM, CLSCTX_INPROC_SERVER, NULL, IID_IClassFactory, reinterpret_cast< void ** >(&pFactory));
if(SUCCEEDED(hr))
{
hr = pFactory->CreateInstance(NULL, IID_ITestCOM, reinterpret_cast< void ** >(ppTestCOM));
RELEASE_INTERFACE(pFactory);
}
#endif
return hr;
}
//This code works perfectly.
STDMETHODIMP CreateTestCOM3(ITestCOM ** ppTestCOM, void **ppContext)
{
HRESULT hrRet = E_FAIL;
LPTSTR libFileName = NULL;
HKEY hMyClsidKey = NULL;
DWORD err = RegOpenKeyEx(HKEY_CLASSES_ROOT, _T("CLSID\\{4883259C-527B-4327-B9BF-6C22079045B5}"), 0, KEY_READ, &hMyClsidKey);
if(err != ERROR_SUCCESS)
{
_tprintf(_T("CreateTestCOM3: RegOpenKeyEx({CLSID}) failed with error %lu.\n"), err);
hrRet = (err==ERROR_FILE_NOT_FOUND ? REGDB_E_CLASSNOTREG : E_UNEXPECTED);
}
else
{
HKEY hInprocKey = NULL;
err = RegOpenKeyEx(hMyClsidKey, _T("InprocServer32"), 0, KEY_READ, &hInprocKey);
if(err != ERROR_SUCCESS)
{
_tprintf(_T("CreateTestCOM3: RegOpenKeyEx(InprocServer32) failed with error %lu.\n"), err);
hrRet = (err==ERROR_FILE_NOT_FOUND ? REGDB_E_KEYMISSING : E_UNEXPECTED);
}
else
{
TCHAR buf[MAX_PATH] = _T("");
DWORD cbData = sizeof buf;
DWORD type = 0;
err = RegQueryValueEx(hInprocKey, NULL, NULL, &type, reinterpret_cast<LPBYTE>(buf), &cbData);
if(err != ERROR_SUCCESS)
{
_tprintf(_T("CreateTestCOM3: RegQueryValueEx() failed with error %lu.\n"), err);
}
else if(type != REG_SZ)
{
_putts(_T("CreateTestCOM3: Inproc key's default value is not a REG_SZ."));
}
else if((cbData & 1) != 0)
{
_putts(_T("CreateTestCOM3: Inproc key's default value has odd size."));
}
else if(buf[MAX_PATH-1] != _T('\0'))
{
_putts(_T("CreateTestCOM3: Inproc key's default value is too long."));
}
else
{
libFileName = _tcsdup(buf);
_tprintf(_T("CreateTestCOM3: Successfully retrieved DLL path: %s\n"), libFileName);
}
RegCloseKey(hInprocKey);
}
RegCloseKey(hMyClsidKey);
}
if(libFileName != NULL)
{
//LoadLibrary(), GetProcAddress(), DllGetClassObject(), IClassFactory::CreateInstance().
hrRet = CreateTestCOMFromDLL(libFileName, ppTestCOM, ppContext);
free(libFileName);
}
return hrRet;
}
我还使用WOW64版本的regedit检查了注册表,HKEY_CLASSES_ROOT
和HKEY_CURRENT_USER\Software\Classes
从那里看起来很好。
编辑添加:我使用的是Windows 7,而不是XP / Vista。根据{{3}},这是一个重要的区别。