Sending IOCTLs to Windows NT Drivers

Listing 3: app.c — Sending IOCTL commands

// app.c

#include <windows.h>
#include <winioctl.h>
#include <stdio.h>
#include "wdj.h"

VOID __cdecl main(void)
{
    HANDLE driver;
    ULONG  value = 0, size = 0;

    driver = CreateFile("\\\\.\\wdjdrv", GENERIC_READ | GENERIC_WRITE,
                        0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
                        NULL);

    if (driver == INVALID_HANDLE_VALUE) {
        printf("Error opening wdj Driver (%d)\n", GetLastError());
        return;
    }

    if (!DeviceIoControl(driver, (ULONG)IOCTL_WDJ_REQUEST, NULL, 0,
                         &value, sizeof(ULONG), &size, NULL)) {

        printf("IOCTL_WDJ_REQUEST failed (%d)\n", GetLastError());
        return;
    }

    CloseHandle(driver);
    printf("IOCTL_WDJ_REQUEST returned %d\n", value);
}
/* End of File */