如何開啟windows mobile擴音器

#include <windows.h>

#define CTL_CODE( DeviceType, Function, Method, Access ) (                 /
    ((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) /
)

#define METHOD_BUFFERED                 0
#define FILE_ANY_ACCESS                 0

#define FILE_DEVICE_SPEAKER                 32770
#define IOCTL_SPEAKER_ADD_NOTIFY_HWND        CTL_CODE( FILE_DEVICE_SPEAKER, 2052, METHOD_BUFFERED, FILE_ANY_ACCESS )
#define IOCTL_SPEAKER_REMOVE_NOTIFY_HWND    CTL_CODE( FILE_DEVICE_SPEAKER, 2053, METHOD_BUFFERED, FILE_ANY_ACCESS )
#define IOCTL_SPEAKER_GETMODE            CTL_CODE( FILE_DEVICE_SPEAKER, 2054, METHOD_BUFFERED, FILE_ANY_ACCESS )
#define IOCTL_SPEAKER_SETMODE            CTL_CODE( FILE_DEVICE_SPEAKER, 2055, METHOD_BUFFERED, FILE_ANY_ACCESS )

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR    lpCmdLine,
                   int       nCmdShow)
{
    HANDLE hSpk = CreateFile(TEXT("SPK1:"), 0, 0, NULL, OPEN_EXISTING, 0, NULL);
    if(INVALID_HANDLE_VALUE != hSpk)
    {
        DWORD dwSpkMode = TRUE;
        DeviceIoControl(hSpk, IOCTL_SPEAKER_SETMODE, &dwSpkMode, sizeof(dwSpkMode), NULL, 0, NULL, NULL);
        CloseHandle(hSpk);
    }
    return 0;
}