keytrac.c

MS-Press book about programming under Windows CE with source-codes of examples

//======================================================================
// KeyTrac - displays keyboard messages
//
// Written for the book Programming Windows CE
// Copyright (C) 1998 Douglas Boling
//
//======================================================================
#include <windows.h>                 // For all that Windows stuff
#include <commctrl.h>                // Command bar includes
#include "keytrac.h"                 // Program-specific stuff

//----------------------------------------------------------------------
// Global data
//
const TCHAR szAppName[] = TEXT("KeyTrac");
HINSTANCE hInst;                     // Program instance handle

// Program-specific global data
KEYARRAY ka[16];
UINT wKeyMsg = 0;
INT nKeyCnt = 0, nFontHeight;
TCHAR szMsgTxt[64];

// Message dispatch table for MainWindowProc
const struct decodeUINT MainMessages[] = {
    WM_CREATE, DoCreateMain,
    WM_PAINT, DoPaintMain,
    WM_KEYUP, DoKeysMain,
    WM_KEYDOWN, DoKeysMain,
    WM_CHAR, DoKeysMain,
    WM_DEADCHAR, DoKeysMain,
    WM_SYSCHAR, DoKeysMain,
    WM_SYSDEADCHAR, DoKeysMain,
    WM_SYSKEYDOWN, DoKeysMain,
    WM_SYSKEYUP, DoKeysMain,
    WM_DESTROY, DoDestroyMain,
};

//======================================================================
//
// Program entry point
//
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    LPWSTR lpCmdLine, int nCmdShow) {
    MSG msg;
    int rc = 0;
    HWND hwndMain;

    // Initialize application.
    rc = InitApp (hInstance);
    if (rc) return rc;

    // Initialize this instance.
    hwndMain = InitInstance (hInstance, lpCmdLine, nCmdShow);
    if (hwndMain == 0)
        return 0x10;
    
    // Application message loop
    while (GetMessage (&msg, NULL, 0, 0)) {
        TranslateMessage (&msg);
        DispatchMessage (&msg);
    }
    // Instance cleanup
    return TermInstance (hInstance, msg.wParam);
}
//----------------------------------------------------------------------
// InitApp - Application initialization
//
int InitApp (HINSTANCE hInstance) {
    WNDCLASS wc;

    // Register application main window class.
    wc.style = 0;                             // Window style
    wc.lpfnWndProc = MainWndProc;             // Callback function
    wc.cbClsExtra = 0;                        // Extra class data
    wc.cbWndExtra = 0;                        // Extra window data
    wc.hInstance = hInstance;                 // Owner handle
    wc.hIcon = NULL,                          // Application icon
    wc.hCursor = NULL;                        // Default cursor
    wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
    wc.lpszMenuName =  NULL;                  // Menu name
    wc.lpszClassName = szAppName;             // Window class name

    if (RegisterClass(&wc) == 0) return 1;

    return 0;
}
//----------------------------------------------------------------------
// InitInstance - Instance initialization
//
HWND InitInstance (HINSTANCE hInstance, LPWSTR lpCmdLine, int nCmdShow) {
                   HWND hWnd;

    // Save program instance handle in global variable.
    hInst = hInstance;

    // Create main window.
    hWnd = CreateWindow (szAppName,           // Window class
                         TEXT("KeyTrac"),     // Window title
                         WS_VISIBLE,          // Style flags
                         CW_USEDEFAULT,       // x position
                         CW_USEDEFAULT,       // y position
                         CW_USEDEFAULT,       // Initial Width
                         CW_USEDEFAULT,       // Initial Height
                         NULL,                // Parent 
                         NULL,                // Menu, must be null
                         hInstance,           // App instance
                         NULL);               // Pointer to create
                                              // parameters
    // Return fail code if window not created.
    if (!IsWindow (hWnd)) return 0;

    // Standard show and update calls
    ShowWindow (hWnd, nCmdShow);
    UpdateWindow (hWnd);
    return hWnd;
}
//----------------------------------------------------------------------
// TermInstance - Program cleanup
//
int TermInstance (HINSTANCE hInstance, int nDefRC) {

    return nDefRC;
}
//======================================================================
// Message handling procedures for MainWindow
//

//----------------------------------------------------------------------
// MainWndProc - Callback function for application window
//
LRESULT CALLBACK MainWndProc (HWND hWnd, UINT wMsg, WPARAM wParam, 
                             LPARAM lParam) {
    INT i;
    //
    // Search message list to see if we need to handle this
    // message.  If in list, call procedure.
    //
    for (i = 0; i < dim(MainMessages); i++) {
        if (wMsg == MainMessages[i].Code)
            return (*MainMessages[i].Fxn)(hWnd, wMsg, wParam, lParam);
    }
    return DefWindowProc (hWnd, wMsg, wParam, lParam);
}
//----------------------------------------------------------------------
// DoCreateMain - Process WM_CREATE message for window.
//
LRESULT DoCreateMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                      LPARAM lParam) {
    HWND hwndCB;
    HDC hdc;
    TEXTMETRIC tm;

    // Create a command bar.
    hwndCB = CommandBar_Create (hInst, hWnd, IDC_CMDBAR);

    // Add exit button to command bar.
    CommandBar_AddAdornments (hwndCB, 0, 0);

    // Get the height of the default font.
    hdc = GetDC (hWnd);
    GetTextMetrics (hdc, &tm);
    nFontHeight = tm.tmHeight + tm.tmExternalLeading;
    ReleaseDC (hWnd, hdc);

    return 0;
}
//----------------------------------------------------------------------
// DoPaintMain - Process WM_PAINT message for window.
//
LRESULT DoPaintMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                     LPARAM lParam) {
    PAINTSTRUCT ps;
    RECT rect, rectOut;
    TCHAR szOut[256];
    HDC hdc;
    INT i;

    // Adjust the size of the client rect to take into account
    // the command bar height.
    GetClientRect (hWnd, &rect);
    rect.top += CommandBar_Height (GetDlgItem (hWnd, IDC_CMDBAR));

    // Create a drawing rectangle for the bottom line of the window.
    rectOut = rect;
    rectOut.top = rectOut.bottom - nFontHeight;

    hdc = BeginPaint (hWnd, &ps); 

    if (nKeyCnt) {
        for (i = 0; i < nKeyCnt; i++) {
            // Scroll window up by one line.
            ScrollDC (hdc, 0, -nFontHeight, &rect, &rect, NULL, NULL);
            // Write key name, use opaque mode to erase background.
            ExtTextOut (hdc, 5, rect.bottom - nFontHeight, ETO_OPAQUE,
                        &rectOut, ka[i].szMsgTxt, 
                        lstrlen (ka[i].szMsgTxt), NULL);
            // Write key variables.
            wsprintf (szOut, TEXT ("wParam:%08x    lParam:%08x    shift: "), 
                      ka[i].wParam, ka[i].lParam);

            if (ka[i].wFlags & FLAG_LMENU)
                lstrcat (szOut, TEXT ("lA "));
            if (ka[i].wFlags & FLAG_RMENU)
                lstrcat (szOut, TEXT ("rA "));

            if (ka[i].wFlags & FLAG_LCONTROL)
                lstrcat (szOut, TEXT ("lC "));
            if (ka[i].wFlags & FLAG_RCONTROL)
                lstrcat (szOut, TEXT ("rC "));

            if (ka[i].wFlags & FLAG_LSHIFT)
                lstrcat (szOut, TEXT ("lS "));
            if (ka[i].wFlags & FLAG_RSHIFT)
                lstrcat (szOut, TEXT ("rS "));

            ExtTextOut (hdc, 125, rect.bottom - nFontHeight, 0, NULL,
                        szOut, lstrlen (szOut), NULL);
        }
        nKeyCnt = 0;
    }
    EndPaint (hWnd, &ps); 
    return 0;
}
//----------------------------------------------------------------------
// DoKeysMain - Process all keyboard messages for window.
//
LRESULT DoKeysMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                    LPARAM lParam) {

    if (nKeyCnt >= 16)
        return 0;

    switch (wMsg) {
        case WM_KEYUP:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_KEYUP"));
            break;

        case WM_KEYDOWN:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_KEYDOWN"));
            break;

        case WM_CHAR:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_CHAR"));
            break;

        case WM_DEADCHAR:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_DEADCHAR"));
            break;

        case WM_SYSCHAR:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_SYSCHAR"));
            break;

        case WM_SYSDEADCHAR:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_SYSDEADCHAR"));
            break;

        case WM_SYSKEYDOWN:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_SYSKEYDOWN"));
            break;

        case WM_SYSKEYUP:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("WM_SYSKEYUP"));
            break;

        default:
            lstrcpy (ka[nKeyCnt].szMsgTxt, TEXT ("unknown"));
            break;
    }
    ka[nKeyCnt].wKeyMsg = wMsg;
    ka[nKeyCnt].wParam = wParam;
    ka[nKeyCnt].lParam = lParam;

    // Capture the state of the shift flags.
    ka[nKeyCnt].wFlags = 0;
    if (GetKeyState (VK_LMENU))
        ka[nKeyCnt].wFlags |= FLAG_LMENU;
    if (GetKeyState (VK_RMENU))
        ka[nKeyCnt].wFlags |= FLAG_RMENU;

    if (GetKeyState (VK_LCONTROL))
        ka[nKeyCnt].wFlags |= FLAG_LCONTROL;
    if (GetKeyState (VK_RCONTROL))
        ka[nKeyCnt].wFlags |= FLAG_RCONTROL;

    if (GetKeyState (VK_LSHIFT))
        ka[nKeyCnt].wFlags |= FLAG_LSHIFT;
    if (GetKeyState (VK_RSHIFT))
        ka[nKeyCnt].wFlags |= FLAG_RSHIFT;

    nKeyCnt++;
    InvalidateRect (hWnd, NULL, FALSE);
    return 0;
}
//----------------------------------------------------------------------
// DoDestroyMain - Process WM_DESTROY message for window.
//
LRESULT DoDestroyMain (HWND hWnd, UINT wMsg, WPARAM wParam,
                       LPARAM lParam) {
    PostQuitMessage (0);
    return 0;
}