Cannot call SAPI from dll
- by Quandary
Question: The below code works fine as long as it is in an executable.
It uses the msft (text-to-)speech API (SAPI).
But as soon as I put it in a dll and load it with loadlibrary from an executable, it doesn't work.
I've also tried to change
CoInitialize(NULL);
to
CoInitializeEx(NULL,COINIT_MULTITHREADED);
and I tried with all possible flags (
COINIT_APARTMENTTHREADED, COINIT_MULTITHREADED, COINIT_DISABLE_OLE1DDE, COINIT_SPEED_OVER_MEMORY)
But it's always stuck at
hr = CoCreateInstance(__uuidof(SpVoice), NULL, CLSCTX_INPROC_SERVER, IID_ISpVoice, (void **) &pVoice);
I also tried those flags here: CLSCTX_INPROC_SERVER,CLSCTX_SERVER, CLSCTX_ALL, but nothing seems to help...
There are no errors, it doesn't crash, it just sleeps forever at CoCreateInstance...
This is the code as single exe (working)
#include <windows.h>
#include <sapi.h>
#include <iostream>
#include <cstdlib>
int main(int argc, char* argv[])
{
ISpVoice * pVoice = NULL;
//CoInitializeEx(NULL,COINIT_MULTITHREADED);
HRESULT hr = CoInitialize(NULL);
if( FAILED(hr) )
{
MessageBox(NULL, TEXT("Failed To Initialize"), TEXT("Error"),0);
printf("Failed!\n");
char buffer[2000] ;
sprintf(buffer, "An error occured: 0x%08X.\n", hr);
FILE * pFile = fopen ( "c:\\temp\\CoInitialize_exe.txt" , "w" );
fwrite (buffer , 1 , sizeof(buffer) , pFile );
fclose (pFile);
}
else
{
//CoGetClassObject(CLSID_SpVoice, CLSCTX_INPROC_SERVER, NULL, IID_IClassFactory, (void**) &pClsF);
//hr = CoGetClassObject(CLSID_SpVoice, CLSCTX_INPROC_SERVER, NULL, IID_IClassFactory, (void**) &pClsF);
hr = CoCreateInstance(__uuidof(SpVoice), NULL, CLSCTX_INPROC_SERVER, IID_ISpVoice, (void **) &pVoice);
//HRESULT hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **) &pVoice);
if( SUCCEEDED( hr ) )
{
hr = pVoice->Speak(L"Test Test", 0, NULL);
hr = pVoice->Speak(L"This sounds normal <pitch middle = '-10'/> but the pitch drops half way through", SPF_IS_XML, NULL );
pVoice->Release();
pVoice = NULL;
}
else
{
MessageBox(NULL, TEXT("Failed To Create a COM instance..."), TEXT("Error"),0);
char buffer[2000] ;
sprintf(buffer, "An error occured: 0x%08X.\n", hr);
FILE * pFile = fopen ( "c:\\temp\\CoCreateInstance_exe.txt" , "w" );
fwrite (buffer , 1 , sizeof(buffer) , pFile );
fclose (pFile);
}
}
CoUninitialize();
return EXIT_SUCCESS;
}
This is the exe loading the dll (stays forever at printf("trying to create instance.\n"); )
#include <windows.h>
#include <sapi.h>
#include <iostream>
#include <cstdlib>
int main(int argc, char* argv[])
{
// C:\Windows\System32\Speech\Common\sapi.dll
//LoadLibraryA("sapi.dll");
LoadLibraryA("Sapidll2.dll");
return EXIT_SUCCESS; // Frankly, that would be nice...
}
And this is Sapidll2.dll
// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"
#include <iostream>
#include <cstdlib>
#include <string>
#include <windows.h>
#include <sapi.h>
int init_engine()
{
ISpVoice * pVoice = NULL;
//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);
}
}
if(pVoice != NULL)
{
pVoice->Release();
pVoice = NULL;
}
CoUninitialize();
return true ;
}
BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
init_engine();
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
