Can't you just use Tolk? Or does the Tolk crate not allow you to do that? That's how I've always done it.
Update: your right. Searching for TTS through SAPI, I've found examples in .NET and other platforms and using other services, but never through C itself. I know Tolk can do it -- it does it, so below I've pasted the code, from tolk/src/ScreenReaderDriverSAPI.h and tolk/src/ScreenReaderDriverSAPI.cpp:
tolk/src/ScreenReaderDriverSAPI.h:
#include <sapi.h>
#include "ScreenReaderDriver.h"
class ScreenReaderDriverSAPI : public ScreenReaderDriver {
public:
ScreenReaderDriverSAPI();
~ScreenReaderDriverSAPI();
public:
bool Speak(const wchar_t *str, bool interrupt);
bool Braille(const wchar_t *) { return false; }
bool IsSpeaking();
bool Silence();
bool IsActive() { return (!!controller); }
bool Output(const wchar_t *str, bool interrupt) { return Speak(str, interrupt); }
private:
void Initialize();
void Finalize();
private:
ISpVoice *controller;
};
Tolk/src/ScreenReaderDriverSAPI.cpp:
ScreenReaderDriverSAPI::ScreenReaderDriverSAPI() :
ScreenReaderDriver(L"SAPI", true, false),
controller(NULL)
{
Initialize();
}
ScreenReaderDriverSAPI::~ScreenReaderDriverSAPI() {
Finalize();
}
bool ScreenReaderDriverSAPI::Speak(const wchar_t *str, bool interrupt) {
if (!controller) return false;
DWORD flags = SPF_ASYNC | SPF_IS_NOT_XML;
if (interrupt) flags |= SPF_PURGEBEFORESPEAK;
return SUCCEEDED(controller->Speak(str, flags, NULL));
}
bool ScreenReaderDriverSAPI::IsSpeaking() {
if (!controller) return false;
SPVOICESTATUS status;
// The second parameter to GetStatus() can be NULL,
// suppress warning when compiling with /analyze.
#pragma warning(suppress:6387)
if (FAILED(controller->GetStatus(&status, NULL))) return false;
return (status.dwRunningState == SPRS_IS_SPEAKING);
}
bool ScreenReaderDriverSAPI::Silence() {
if (!controller) return false;
const DWORD flags = SPF_ASYNC | SPF_IS_NOT_XML | SPF_PURGEBEFORESPEAK;
return SUCCEEDED(controller->Speak(NULL, flags, NULL));
}
void ScreenReaderDriverSAPI::Initialize() {
if (controller || FAILED(CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_INPROC_SERVER, IID_ISpVoice, (void **)&controller))) {
// This is here for symmetry with other drivers
// and so compiling /analyze won't throw a warning.
return;
}
}
void ScreenReaderDriverSAPI::Finalize() {
if (controller) {
controller->Release();
controller = NULL;
}
}
This is a bit too much, I think. So I think you can abstract it to just:
#include <sapi.h>
#include <windows.h>
ISpVoice *controller;
int main() {
controller->Speak("This is a test", SPF_ASYNC | SPF_IS_NOT_XML|SPF_PURGEBEFORESPEAK, NULL);
controller->WaitUntilDone(INFINITE);
controller->release();
return 0;
}
I don't know if that's correct though, I've never manually invoked SAPI. If yoru going to be invoking SAPI a lot, remove the second line (controller->WaitUntilDone). That blocks the thread until its done speaking, see https://docs.microsoft.com/en-us/previo … 3Dmsdn.10) for details.
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