fileview.c

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

//======================================================================
// FileView - A Windows CE file viewer
//
// 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 <commdlg.h>                 // Common dialog includes

#include "FileView.h"                // Program-specific stuff
#include "Viewer.h"                  // Program-specific stuff

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

// Message dispatch table for MainWindowProc
const struct decodeUINT MainMessages[] = {
    WM_CREATE, DoCreateMain,
    WM_SIZE, DoSizeMain,
    WM_COMMAND, DoCommandMain,
    WM_DESTROY, DoDestroyMain,
};

// Command message dispatch for MainWindowProc
const struct decodeCMD MainCommandItems[] = {
    IDM_OPEN, DoMainCommandOpen,
    IDM_EXIT, DoMainCommandExit,
    IDM_ABOUT, DoMainCommandAbout,
};
//======================================================================
//
// Program entry point
//
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    LPWSTR lpCmdLine, int nCmdShow) {
    HWND hwndMain;
    MSG msg;
    int rc = 0;

    // 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;
    INITCOMMONCONTROLSEX icex;

    // 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;

    RegisterCtl (hInstance);                  // Register viewer window.

    // Load the command bar common control class.
    icex.dwSize = sizeof (INITCOMMONCONTROLSEX);
    icex.dwICC = ICC_BAR_CLASSES;
    InitCommonControlsEx (&icex);
    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 ("FileView"),   // 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,           // Application 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) {

    TermViewer (hInstance, 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, hwndChild;
    INT nHeight, nCnt;
    RECT rect;
    LPCREATESTRUCT lpcs;

    // Convert lParam into pointer to create structure.
    lpcs = (LPCREATESTRUCT) lParam;

    // Create a minimal command bar that only has a menu and an 
    // exit button.
    hwndCB = CommandBar_Create (hInst, hWnd, IDC_CMDBAR);
    // Insert the menu.
    CommandBar_InsertMenubar (hwndCB, hInst, ID_MENU, 0);
    // Add exit button to command bar. 
    CommandBar_AddAdornments (hwndCB, 0, 0);
    nHeight = CommandBar_Height (hwndCB);

    SetRect (&rect, 0, nHeight, lpcs->cx, lpcs->cy - nHeight);
    hwndChild = CreateViewer (hWnd, &rect, ID_VIEWER);

    // Destroy frame if window not created.
    if (!IsWindow (hwndChild)) {
        DestroyWindow (hWnd);
        return 0;
    }
    ListView_SetItemCount (hwndChild, nCnt);
    return 0;
}
//----------------------------------------------------------------------
// DoSizeMain - Process WM_SIZE message for window.
// 
LRESULT DoSizeMain (HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam){
    HWND hwndViewer;
    RECT rect;

    hwndViewer = GetDlgItem (hWnd, ID_VIEWER);

    // 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));

    SetWindowPos (hwndViewer, NULL, rect.left, rect.top, 
                  (rect.right - rect.left), rect.bottom - rect.top,
                  SWP_NOZORDER);
    return 0;
}
//----------------------------------------------------------------------
// DoCommandMain - Process WM_COMMAND message for window.
// 
LRESULT DoCommandMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                       LPARAM lParam) {
    WORD idItem, wNotifyCode;
    HWND hwndCtl;
    INT i;

    // Parse the parameters.
    idItem = (WORD) LOWORD (wParam);
    wNotifyCode = (WORD) HIWORD (wParam);
    hwndCtl = (HWND) lParam;

    // Call routine to handle control message.
    for (i = 0; i < dim(MainCommandItems); i++) {
        if (idItem == MainCommandItems[i].Code)
            return (*MainCommandItems[i].Fxn)(hWnd, idItem, hwndCtl, 
                                              wNotifyCode);
    }
    return 0;
}
//----------------------------------------------------------------------
// DoDestroyMain - Process WM_DESTROY message for window.
//
LRESULT DoDestroyMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                       LPARAM lParam) {
    PostQuitMessage (0);
    return 0;
}
//======================================================================
// Command handler routines
//
//----------------------------------------------------------------------
// DoMainCommandOpen - Process File Open command.
//
LPARAM DoMainCommandOpen (HWND hWnd, WORD idItem, HWND hwndCtl, 
                          WORD wNotifyCode) {
    TCHAR szFileName[MAX_PATH], szText[64];
    HWND hwndViewer;
    INT rc;

    hwndViewer = GetDlgItem (hWnd, ID_VIEWER);

    if (MyGetFileName (hWnd, szFileName, dim(szFileName)) == 0)
        return 0;
    // Tell the viewer control to open the file.
    rc = SendMessage (hwndViewer, VM_OPEN, 0, (LPARAM)szFileName);

    if (rc) {
        wsprintf (szText, TEXT ("File open failed.  rc: %d ") ,rc);
        MessageBox (hWnd, szText, szAppName, MB_OK);
        return 0;
    }
    return 0;
}
//----------------------------------------------------------------------
// DoMainCommandExit - Process Program Exit command.
//
LPARAM DoMainCommandExit (HWND hWnd, WORD idItem, HWND hwndCtl, 
                          WORD wNotifyCode) {

    SendMessage (hWnd, WM_CLOSE, 0, 0);
    return 0;
}
//----------------------------------------------------------------------
// DoMainCommandVText - Process the View Text command.
//
LPARAM DoMainCommandVText (HWND hWnd, WORD idItem, HWND hwndCtl, 
                           WORD wNotifyCode) {
    return 0;
}
//----------------------------------------------------------------------
// DoMainCommandVHex - Process the View Hex command.
//
LPARAM DoMainCommandVHex (HWND hWnd, WORD idItem, HWND hwndCtl, 
                          WORD wNotifyCode) {
    return 0;
}
//----------------------------------------------------------------------
// DoMainCommandAbout - Process the Help | About menu command.
//
LPARAM DoMainCommandAbout(HWND hWnd, WORD idItem, HWND hwndCtl, 
                          WORD wNotifyCode) {

    // Use DialogBox to create a modal dialog.
    DialogBox (hInst, TEXT ("aboutbox"), hWnd, AboutDlgProc);
    return 0;
}
//======================================================================
// About Dialog procedure
//
BOOL CALLBACK AboutDlgProc (HWND hWnd, UINT wMsg, WPARAM wParam, 
                            LPARAM lParam) {
    switch (wMsg) {
        case WM_COMMAND:
            switch (LOWORD (wParam)) {
                case IDOK:
                case IDCANCEL:
                    EndDialog (hWnd, 0);
                    return TRUE;
            }
        break;
    }
    return FALSE;
}

//----------------------------------------------------------------------
// MyGetFileName - Returns a filename using the common dialog.
//
INT MyGetFileName (HWND hWnd, LPTSTR szFileName, INT nMax) {
    OPENFILENAME of;
    const LPTSTR pszOpenFilter = TEXT ("All Documents (*.*)\0*.*\0\0");

    szFileName[0] = '\0';                 // Initial filename
    memset (&of, 0, sizeof (of));         // Initial file open structure

    of.lStructSize = sizeof (of);
    of.hwndOwner = hWnd;
    of.lpstrFile = szFileName;
    of.nMaxFile = nMax;
    of.lpstrFilter = pszOpenFilter;
    of.Flags = 0;

    if (GetOpenFileName (&of))
        return lstrlen (szFileName);
    else
        return 0;
}