void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
{
    switch(id)                                 // 按钮
    {
        case ID_MENUITEMOPEN:
        {
            
                OPENFILENAME ofn;


                char szFile[MAX_PATH];


                ZeroMemory(&ofn,sizeof(ofn));  //给结构体清零


                ofn.lStructSize = sizeof(ofn);


                ofn.lpstrFile = szFile;



                ofn.lpstrFile[0] = TEXT('\0');


                ofn.nMaxFile = sizeof(szFile);


                ofn.lpstrFilter = TEXT("ALL\0*.*\0mp3\0*.mp3\0");   //过滤器后缀选项


                ofn.nFilterIndex = 2;                            //默认选择的过滤第一选项 这里为ALL


                ofn.lpstrFileTitle = NULL;


                ofn.nMaxFileTitle = 0;


                ofn.lpstrInitialDir = NULL;

                ofn.hwndOwner = hwnd;//打开后不能点击其他复选框


                ofn.Flags = OFN_ALLOWMULTISELECT|OFN_HIDEREADONLY|OFN_EXPLORER |OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;//打开文件风格。例如多个文件打开



                if (GetOpenFileName(&ofn))   // 上面是打开选择框 程序


                {
                    
                            TCHAR ss[256],aa[256];
                            wsprintf(ss,"%s",szFile); // 上面打开选择文件返回的是文件的地址 例如是F：\***   但是在C中、\用\\表示 所以导致
                    //    MessageBox(hwnd,ss,"",MB_OK);  //了无法获得正确的路径 这个该怎么解决
                   //    SetWindowText(hwndDlg,ss);
                            GetShortPathName(ss,aa,sizeof(aa));
                            TCHAR dd[256];
                            wsprintf(dd,"play %s",aa);
                            mciSendString("play music","",0,NULL);
                    //TCHAR str[256],str1[256];
                    //GetShortPathName("F:\\kugou\\silence - 放不下.mp3",str,sizeof(str));
                    //wsprintf(str1,"play %s",str);
                    //mciSendString(str1,"",0,NULL);
                    
                }

            
          选择一个音乐文件打开后但是却无法播放  希望大家帮组下

MCI接口，需要传入文件路径

不用解决，ofn.nMaxFile已经是正确的路径了。
代码mciSendString("play music","",0,NULL);对吗？？
改成mciSendString(dd,"",0,NULL);可以正确播放

支持楼上的