fontlist.c

WinCE下多种字体的屏幕演示程序

//======================================================================
// FontList - Lists the available fonts in the system
//
// 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 "FontList.h"                // Program-specific stuff

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

FONTFAMSTRUCT ffs[FAMILYMAX];
INT sFamilyCnt = 0;

// Message dispatch table for MainWindowProc
const struct decodeUINT MainMessages[] = {
    WM_CREATE, DoCreateMain,
    WM_PAINT, DoPaintMain,
    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("Font Listing"),// 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) {

    return nDefRC;
}
//======================================================================
// Font callback functions
//
//----------------------------------------------------------------------
// FontFamilyCallback - Callback function that enumerates the font 
// families
//
int CALLBACK FontFamilyCallback (CONST LOGFONT *lplf, 
                                 CONST TEXTMETRIC *lpntm, 
                                 DWORD nFontType, LPARAM lParam) {
    int rc = 1;

    // Stop enumeration if array filled.
    if (sFamilyCnt >= FAMILYMAX)
        return 0;
    // Copy face name of font.
    lstrcpy (ffs[sFamilyCnt++].szFontFamily, lplf->lfFaceName);

    return rc;
}
//----------------------------------------------------------------------
// EnumSingleFontFamily - Callback function that enumerates fonts
//
int CALLBACK EnumSingleFontFamily (CONST LOGFONT *lplf, 
                                   CONST TEXTMETRIC *lpntm, 
                                   DWORD nFontType, LPARAM lParam) {
    PFONTFAMSTRUCT pffs;

    pffs = (PFONTFAMSTRUCT) lParam;
    pffs->nNumFonts++;    // Increment count of fonts in family
    return 1;
}
//----------------------------------------------------------------------
// PaintSingleFontFamily - Callback function that draws a font
//
int CALLBACK PaintSingleFontFamily (CONST LOGFONT *lplf, 
                                    CONST TEXTMETRIC *lpntm, 
                                    DWORD nFontType, LPARAM lParam) {
    PPAINTFONTINFO ppfi;
    TCHAR szOut[256];
    INT nFontHeight, nPointSize;
    HFONT hFont, hOldFont;

    ppfi = (PPAINTFONTINFO) lParam;  // Translate lParam into struct
                                     // pointer.

    // Create the font from the LOGFONT structure passed.
    hFont = CreateFontIndirect (lplf);

    // Select the font into the device context.
    hOldFont = SelectObject (ppfi->hdc, hFont);

    // Compute font size.
    nPointSize = (lplf->lfHeight * 72) / 
                 GetDeviceCaps(ppfi->hdc,LOGPIXELSY);

    // Format string and paint on display.
    wsprintf (szOut, TEXT("%s   Point:%d"), lplf->lfFaceName, 
              nPointSize);
    ExtTextOut (ppfi->hdc, 25, ppfi->yCurrent, 0, NULL,
                szOut, lstrlen (szOut), NULL);

    // Compute the height of the default font.
    nFontHeight = lpntm->tmHeight + lpntm->tmExternalLeading;

    // Update new draw point.
    ppfi->yCurrent += nFontHeight;

    // Deselect font and delete.
    SelectObject (ppfi->hdc, hOldFont);
    DeleteObject (hFont);
    return 1;
}
//======================================================================
// 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;
    INT i, rc;

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

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

    //Enumerate the available fonts
    hdc = GetDC (hWnd);
    rc = EnumFontFamilies ((HDC)hdc, (LPTSTR)NULL,
        FontFamilyCallback, 0);

    for (i = 0; i < sFamilyCnt; i++) {
        ffs[i].nNumFonts = 0;
        rc = EnumFontFamilies ((HDC)hdc, ffs[i].szFontFamily, 
                               EnumSingleFontFamily, 
                               (LPARAM)(PFONTFAMSTRUCT)&ffs[i]);
    }
    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;
    HDC hdc;
    TEXTMETRIC tm;
    INT nFontHeight, i;
    TCHAR szOut[256];
    PAINTFONTINFO pfi;

    // 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));

    hdc = BeginPaint (hWnd, &ps); 

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

    // Initialize struct that is passed to enumerate function.
    pfi.yCurrent = rect.top;
    pfi.hdc = hdc;
    for (i = 0; i < sFamilyCnt; i++) {

        // Format output string and paint font family name.
        wsprintf (szOut, TEXT ("Family: %s   "),
                  ffs[i].szFontFamily);
        ExtTextOut (hdc, 5, pfi.yCurrent, 0, NULL,
                    szOut, lstrlen (szOut), NULL);
        pfi.yCurrent += nFontHeight;

        // Enumerate each family to draw a sample of that font.
        EnumFontFamilies ((HDC)hdc, ffs[i].szFontFamily, 
                          PaintSingleFontFamily, 
                          (LPARAM)&pfi);
    }
    EndPaint (hWnd, &ps); 
    return 0;
}
//----------------------------------------------------------------------
// DoDestroyMain - Process WM_DESTROY message for window.
//
LRESULT DoDestroyMain (HWND hWnd, UINT wMsg, WPARAM wParam, 
                       LPARAM lParam) {
    PostQuitMessage (0);
    return 0;
}