SetTimer函数问题

#include <stdio.h>

#include <stdlib.h>

#include <windows.h>



const int IDT_TIMER1 = 0;



void CALLBACK TimeProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)

{

    MessageBox (0, "Test Message from DLL!\n", "DLL Message", MB_ICONINFORMATION);

}



int main(int argc, char *argv[])

{

    HANDLE hwnd;

    HANDLE hDev;

    char buf[512] = {'\0'};

    DWORD num;

    int i = 0;



    system("title Test");



    hwnd = FindWindowA(NULL,"Test");

    if (hwnd == INVALID_HANDLE_VALUE)

    {

        fprintf(stderr, "Not found\n");

        exit(1);

    }



    num = SetTimer(NULL, IDT_TIMER1, 1000, TimeProc);

    printf("handle=%#x --------------->>>> Timer ok? %#x Err:%d\n", hwnd, num, GetLastError());

    printf("--------------------------------------------------------------------"

           "-----------\n", hwnd, num, GetLastError());





    hDev = CreateFileA("\\\\.\\PHYSICALDRIVE0", GENERIC_READ, FILE_SHARE_READ,

                        0,

                        OPEN_EXISTING,

                        0,

                        0);

    if (hDev == INVALID_HANDLE_VALUE)

    {

        fprintf(stderr, "\\\\.\\PHYSICALDRIVE0 Open Error\n");

        exit(1);

    }



    ReadFile(hDev, buf, 512, &num, NULL);



    CloseHandle(hDev);



    for (i=0; i<512; i++)

    {

        printf("%02X%c", buf[i]&0xFF, (i+1)%26?' ':'\n');

    }

    printf("\nNum: %d bytes", num);



    _getch();

    return 0;

}