标签：case 显示 iFont hwnd 程序 wndclass 字体 SB FONT

#include <windows.h>

int min(int a, int b)
{
    return a<b?a:b;
}

int max(int a, int b)
{
    return a>b?a:b;
}

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) 
{
    static TCHAR szAppName[] = TEXT("StokFont");
    WNDCLASS     wndclass; 
    HWND         hwnd; 
    MSG          msg; 

    wndclass.style           = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc     = WndProc;
    wndclass.cbClsExtra      = 0;
    wndclass.cbWndExtra      = 0;
    wndclass.hInstance       = hInstance;
    wndclass.hIcon           = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor         = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground   = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName    = NULL;
    wndclass.lpszClassName   = szAppName;

    if(!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("This program requires Windows NT !"), szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName, TEXT("Stock Fonts"),
                        WS_OVERLAPPEDWINDOW | WS_VSCROLL,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

    while(GetMessage(&msg, NULL, 0, 0))
    { 
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 
{
    static struct
    {
        int idStockFont;
        TCHAR* szStockFont;
    }
    stockfont[] = {     OEM_FIXED_FONT,         "OEM_FIXED_FONT",
                        ANSI_FIXED_FONT,        "ANSI_FIXED_FONT",
                        ANSI_VAR_FONT,          "ANSI_VAR_FONT",
                        SYSTEM_FONT,            "SYSTEM_FONT",
                        DEVICE_DEFAULT_FONT,    "DEVICE_DEFAULT_FONT",
                        SYSTEM_FIXED_FONT,      "SYSTEM_FIXED_FONT",
                        DEFAULT_GUI_FONT,       "DEFAULT_GUI_FONT"};
    static int   iFont, cFonts = sizeof stockfont / sizeof stockfont[0];
    HDC          hdc;
    int          i, x, y, cxGrid, cyGrid;
    PAINTSTRUCT  ps;
    TCHAR        szFaceName[LF_FACESIZE], szBuffer[LF_FACESIZE+64];
    TEXTMETRIC   tm;
    
    switch(message) 
    {
    case WM_CREATE:
        SetScrollRange(hwnd, SB_VERT, 0, cFonts-1, TRUE);
        return 0;
        
    case WM_DISPLAYCHANGE:
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;
    
    case WM_VSCROLL:
        switch(LOWORD(wParam))
        {
        case SB_TOP:             
            iFont = 0;
            break;
        case SB_BOTTOM:
            iFont = cFonts-1;
            break;
        case SB_LINEUP:
        case SB_PAGEUP:
            iFont -= 1;
            break;
        case SB_LINEDOWN:
        case SB_PAGEDOWN:
            iFont += 1;
            break;
        case SB_THUMBPOSITION:
            iFont = HIWORD(wParam);
            break;
        }
        iFont = max(0, min(cFonts-1, iFont));
        SetScrollPos(hwnd, SB_VERT, iFont, TRUE);
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;
                
    case WM_KEYDOWN:
        switch(wParam)
        {
        case VK_HOME:
            SendMessage(hwnd, WM_VSCROLL, SB_TOP, 0);
            break;
        case VK_END:
            SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, 0);
            break;
        case VK_PRIOR:
        case VK_LEFT:
        case VK_UP:
            SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0);
            break;
        case VK_NEXT:
        case VK_RIGHT:
        case VK_DOWN:
            SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0);
            break;
        }
        return 0;
        
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        
        SelectObject(hdc, GetStockObject(stockfont[iFont].idStockFont));
        GetTextFace(hdc, LF_FACESIZE, szFaceName);
        GetTextMetrics(hdc, &tm);
        cxGrid = max(3*tm.tmAveCharWidth, 2*tm.tmMaxCharWidth);
        cyGrid = tm.tmHeight + 3;
        
        TextOut(hdc, 0, 0, szBuffer,
                wsprintf(szBuffer, TEXT("%s: Face Name = %s, CharSet = %i"),
                         stockfont[iFont].szStockFont,
                         szFaceName, tm.tmCharSet));
        SetTextAlign(hdc, TA_TOP|TA_CENTER);
        
        //vertical and horizontal lines
        for(i=0; i<17; i++)
        {
            MoveToEx(hdc, (i+2)*cxGrid, 2*cyGrid, NULL);
            LineTo(hdc, (i+2)*cxGrid, 19*cyGrid);
            
            MoveToEx(hdc, cxGrid, (i+3)*cyGrid, NULL);
            LineTo(hdc, 18*cxGrid, (i+3)*cyGrid);
        }
        
        //vertical and horizontal headings
        for(i=0; i<16; i++)
        {
            TextOut(hdc, (2*i+5)*cxGrid/2, 2*cyGrid+2, szBuffer,
                    wsprintf(szBuffer, TEXT("%X-"), i));
            TextOut(hdc, 3*cxGrid/2, (i+3)*cyGrid+2, szBuffer,
                    wsprintf(szBuffer, TEXT("-%X"), i));    
        }
        
        //characters
        for(y=0; y<16; y++)
          for(x=0; x<16; x++)
          {
              TextOut(hdc, (2*x+5)*cxGrid/2, (y+3)*cyGrid+2, szBuffer,
                      wsprintf(szBuffer, TEXT("%c"), 16*x+y));
          }
          
        EndPaint(hwnd, &ps);
        return 0;
        
    case WM_DESTROY: 
        PostQuitMessage(0);
        return 0;            
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

标签：case,显示,iFont,hwnd,程序,wndclass,字体,SB,FONT
来源： https://www.cnblogs.com/lhb666aboluo/p/13699350.html

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