一個小小工程師的心情抒發天地

// Beep.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include 
#include 
#include 
#include 

#pragma comment(lib, "ntdll")

int main(int argc, const char* argv[]) {
	printf("beep [ ]\n");
	int freq = 800, duration = 1000;
	if (argc > 2) {
		freq = atoi(argv[1]);
		duration = atoi(argv[2]);
	}
	
	HANDLE hFile;
	OBJECT_ATTRIBUTES attr;
	UNICODE_STRING name;
	RtlInitUnicodeString(&name, DD_BEEP_DEVICE_NAME_U);
	InitializeObjectAttributes(&attr, &name, OBJ_CASE_INSENSITIVE, nullptr, nullptr);
	IO_STATUS_BLOCK ioStatus;
	auto status = ::NtOpenFile(&hFile, GENERIC_WRITE, &attr, &ioStatus, 0, 0);
	if (NT_SUCCESS(status)) {
		BEEP_SET_PARAMETERS params;
		params.Frequency = freq;
		params.Duration = duration;
		DWORD bytes;
		//
		// play the sound
		//
		printf("Playing freq: %u, duration: %u\n", freq, duration);
		::DeviceIoControl(hFile, IOCTL_BEEP_SET, ¶ms, sizeof(params), nullptr, 0, &bytes, nullptr);

		//
		// the sound starts playing and the call returns immediately
		// Wait so that the app doesn't close
		//
		::Sleep(duration);
		::CloseHandle(hFile);
	}
	else {
		printf("Failed in NtOpenFile (status=0x%X)\n", status);
	}
	return 0;
}