#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <mmsystem.h>
#include <windowsx.h>
#include "resource.h"
#include "MainDlg.h"

BOOL WINAPI Main_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog);
        HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand);
        HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose);
    }
    return FALSE;
}
BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
    return TRUE;
}
void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
{
    switch(id)
    {
        case IDC_OK:
        {
            mciSendString( TEXT("open d:/1.mp3 alias MySong"), NULL, 0, NULL );
            mciSendString( TEXT("play MySong"), "", 0, NULL );
        }
        break;
        default:
        break;
    }
}
void Main_OnClose(HWND hwnd)
{
    EndDialog(hwnd, 0);
}

--------------------Configuration: MusicPlay - Win32 Debug--------------------
Compiling...
MainDlg.cpp
Linking...
MainDlg.obj : error LNK2001: unresolved external symbol __imp__mciSendStringA@16
Debug/MusicPlay.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.
Creating browse info file...

MusicPlay.exe - 1 error(s), 0 warning(s)

运行不了的原因是代码有问题，
具体点是链接出错，
再具体点是缺少一个函数的定义，
还具体点是链接少了一个库，
更具体点是这个库是播放器，能接收外部命令。

呵呵，欢迎讨论。