Hi, I am trying to make a one octave piano. heres my code:


/*  Declare Windows procedure  */

/*  Make the class name into a global variable  */
char szClassName[ ] = "WindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "Piano",             /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nFunsterStil);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
        /* Translate virtual-key messages into character messages */
        /* Send message to WindowProcedure */

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;

/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    switch (message)                  /* handle the messages */
           case WM_CREATE:
                CreateWindow(TEXT("button"), TEXT("C"),
                WS_CHILD | WS_VISIBLE,
                10, 10, 20, 200,
                hwnd, (HMENU) 1, NULL, NULL);
                case WM_COMMAND:
                     if(LOWORD(wParam) == 1)
                                       PlaySoundA(TEXT("Memo.wav"), NULL, SND_FILENAME | SND_ASYNC);
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);

    return 0;

It wont compile. Here is the error: [Linker error] undefined reference to `PlaySoundA@12' any solutions?

Recommended Answers

All 5 Replies

Try adding "Winmm.lib" to the project options under additional link dependencies.

Or add this line to the top of your file: #pragma comment(lib,"Winmm.lib")

ok, for some reason, the winmm.lib file is actually named libwinmm.a i linked it and it works great now. When im finished, ill post the source code so you can try. Also, one more thing, how do you change the color of a button?

ok, i finished it and heres the link to the program: http://www.megaupload.com/?d=G9O7YGMV. Its packed in a .rar. I recorded it with my ipod in my living room. The higher the note, the quieter the note. Have fun.

ok, i finished it and heres the link to the program: http://www.megaupload.com/?d=G9O7YGMV. Its packed in a .rar. I recorded it with my ipod in my living room. The higher the note, the quieter the note. Have fun.

Woah lol you should start using C++ strings and stringstreams! Check this part out:

if(LOWORD(wParam) == 1)
                                       PlaySoundA(TEXT("Memo.wav"), NULL, SND_FILENAME | SND_ASYNC);
                     if(LOWORD(wParam) == 2)
                                       PlaySoundA(TEXT("Memo+(2).wav"), NULL, SND_FILENAME | SND_ASYNC);
                     if(LOWORD(wParam) == 3)
                                       PlaySoundA(TEXT("Memo+(3).wav"), NULL, SND_FILENAME | SND_ASYNC);

If you name your files like this: Memo0, Memo1, Memo2, etc. something like this would work:

string fileName = "Memo";
stringstream ss;
ss << LOWORD(wParam);
fileName += ss.str() + ".wav";
PlaySoundA(TEXT(fileName.c_str()), NULL, SND_FILENAME | SND_ASYNC);

Also for your piano keys you can build an "alphabet" I tend to call it. Then you can use a loop..

string alphabet = "C C# D D# E F F# G G# A A# B C";
stringstream ss(alphabet);
string token;
while( ss >> token )

I'll change it when I get the chance.

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