问题:我在一个线程中启动了MS Text-to-speech引擎,以避免DLL_attach崩溃。它开始很好,文本到语音引擎被初始化,但我不能在线程之外访问ISpVoice。如何在线程外部访问ISpVoice?这是一个全局变量,毕竟......如何访问线程外的线程数据
您可以找到XPThreads: http://www.codeproject.com/KB/threads/XPThreads.aspx
#include <windows.h>
#include <sapi.h>
#include "XPThreads.h"
ISpVoice * pVoice = NULL;
unsigned long init_engine_thread(void* param)
{
Sleep(5000);
printf("lolthread\n");
//HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
HRESULT hr = CoInitialize(NULL);
if(FAILED(hr))
{
MessageBox(NULL, TEXT("Failed To Initialize"), TEXT("Error"), 0);
char buffer[2000] ;
sprintf(buffer, "An error occured: 0x%08X.\n", hr);
FILE * pFile = fopen ("c:\\temp\\CoInitialize_dll.txt" , "w");
fwrite (buffer , 1 , strlen(buffer) , pFile);
fclose (pFile);
}
else
{
printf("trying to create instance.\n");
//HRESULT hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **) &pVoice);
//hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **) &pVoice);
//HRESULT hr = CoCreateInstance(__uuidof(ISpVoice), NULL, CLSCTX_INPROC_SERVER, IID_ISpVoice, (void **) &pVoice);
HRESULT hr = CoCreateInstance(__uuidof(SpVoice), NULL, CLSCTX_ALL, IID_ISpVoice, (void **) &pVoice);
if(SUCCEEDED(hr))
{
printf("Succeeded\n");
hr = pVoice->Speak(L"The text to speech engine has been successfully initialized.", 0, NULL);
}
else
{
printf("failed\n");
MessageBox(NULL, TEXT("Failed To Create COM instance"), TEXT("Error"), 0);
char buffer[2000] ;
sprintf(buffer, "An error occured: 0x%08X.\n", hr);
FILE * pFile = fopen ("c:\\temp\\CoCreateInstance_dll.txt" , "w");
fwrite (buffer , 1 , strlen(buffer) , pFile);
fclose (pFile);
}
}
return NULL;
}
XPThreads* ptrThread = new XPThreads(init_engine_thread);
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
//init_engine();
LoadLibrary(TEXT("ole32.dll"));
ptrThread->Run();
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
if(pVoice != NULL)
{
pVoice->Release();
pVoice = NULL;
}
CoUninitialize();
break;
}
return TRUE;
}
你能指出哪里的代码失败吗?另外,你对“Dll_Attach”有什么问题?请注意,调用DllMain中的LoadLibrary是一个糟糕的主意 - 您可能会遇到Windows用来序列化dll加载的全局锁的大问题。请参阅http://msdn.microsoft.com/en-us/library/ms682583%28VS.85%29.aspx中的备注。不知道这是什么原因造成的问题。 – 2010-04-21 09:04:22
访问问题是由线程造成的,而不是由dllmain造成的。 但是,dllmain负责强制我使用线程,所以间接地说你是对的。 – 2010-04-21 12:04:24