我正在尝试编写一个可以加载托管插件的插件系统。如果有任何异常,主机应该能够卸载插件。对于我的 poc,我在 C# 中有一个示例代码库,它会抛出这样的异常......
public static int StartUp(string arguments)
{
Console.WriteLine("Started exception thrower with args {0}", arguments);
Thread workerThread = new Thread(() =>
{
Console.WriteLine("Starting a thread, doing some important work");
Thread.Sleep(1000);
throw new ApplicationException();
}
);
workerThread.Start();
workerThread.Join();
Console.WriteLine("this should never print");
return 11;
}
然后我有这样的本机win32控制台应用程序..
int _tmain(int argc, _TCHAR* argv[])
{
ICLRMetaHost *pMetaHost = NULL;
HRESULT hr;
ICLRRuntimeInfo *runtimeInfo = NULL;
__try
{
hr = CLRCreateInstance(CLSID_CLRMetaHost, IID_ICLRMetaHost, (LPVOID*)&pMetaHost);
hr = pMetaHost->GetRuntime(L"v4.0.30319",IID_ICLRRuntimeInfo,(LPVOID*)&runtimeInfo);
ICLRRuntimeHost *runtimeHost = NULL;
hr = runtimeInfo->GetInterface(CLSID_CLRRuntimeHost,IID_ICLRRuntimeHost, (LPVOID*)&runtimeHost);
ICLRControl* clrControl = NULL;
hr = runtimeHost->GetCLRControl(&clrControl);
ICLRPolicyManager *clrPolicyManager = NULL;
clrControl->GetCLRManager(IID_ICLRPolicyManager, (LPVOID*)&clrPolicyManager);
clrPolicyManager->SetDefaultAction(OPR_ThreadAbort,eUnloadAppDomain);
hr = runtimeHost->Start();
DWORD returnVal = NULL;
hr = runtimeHost->ExecuteInDefaultAppDomain(L"ExceptionThrower.dll",L"ExceptionThrower.MainExceptionThrower",L"StartUp",L"test",&returnVal);
runtimeHost->Release();
}
__except(1)
{
wprintf(L"\n Error thrown %d",e);
}
return 0;
}
问题是如果我使用上面的代码,主机将完成运行托管代码(“这不应该打印”行将最终打印)如果我删除 clrPolicyManager->SetUnhandledExceptionPolicy(eHostDeterminedPolicy),那么主机进程将崩溃.
可以在非托管主机中完成任何可以从运行时优雅地删除错误应用程序并继续工作的事情吗?