Windows API 函数学习(9)---示例

// TextEample.cpp : Defines the entry point for the application.
//演示了如何创建复选框，下拉列表框，以及字体的使用。遍历系统字体。

#include "stdafx.h"
#include "resource.h"
#include <stdio.h>
#include <stdlib.h>
#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;        // current instance
TCHAR szTitle[MAX_LOADSTRING];        // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];        // The title bar text
LOGFONT lg;
HWND hCombo;
HWND hlfBold;
HWND hlfItalic;
HWND hlfUnderline;
HWND hlfStrikeOut;
HWND hHeight;
// Foward declarations of functions included in this code module:
ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int CALLBACK myFontEnumProc(
          ENUMLOGFONTEX *lpelfe,    // logical-font data
          NEWTEXTMETRICEX *lpntme,  // physical-font data
          DWORD FontType,           // type of font
          LPARAM lParam             // application-defined data
          );

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
  // TODO: Place code here.
 MSG msg;
 HACCEL hAccelTable;

 // Initialize global strings
 LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
 LoadString(hInstance, IDC_TEXTEAMPLE, szWindowClass, MAX_LOADSTRING);
 MyRegisterClass(hInstance);

 // Perform application initialization:
 if (!InitInstance (hInstance, nCmdShow))
 {
  return FALSE;
 }

 hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_TEXTEAMPLE);

 // Main message loop:
 while (GetMessage(&msg, NULL, 0, 0))
 {
  if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
  }
 }

 return msg.wParam;
}

 

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
 WNDCLASSEX wcex;

 wcex.cbSize = sizeof(WNDCLASSEX);

 wcex.style   = CS_HREDRAW | CS_VREDRAW;
 wcex.lpfnWndProc = (WNDPROC)WndProc;
 wcex.cbClsExtra  = 0;
 wcex.cbWndExtra  = 0;
 wcex.hInstance  = hInstance;
 wcex.hIcon   = LoadIcon(hInstance, (LPCTSTR)IDI_TEXTEAMPLE);
 wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
 wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
 wcex.lpszMenuName = (LPCSTR)IDC_TEXTEAMPLE;
 wcex.lpszClassName = szWindowClass;
 wcex.hIconSm  = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

 return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND - process the application menu
//  WM_PAINT - Paint the main window
//  WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 int wmId, wmEvent;
 PAINTSTRUCT ps;
 HDC hdc;
 TCHAR szHello[MAX_LOADSTRING];
 LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

 switch (message)
 {
 case WM_CREATE:
        char zero[4];
  strcpy(zero,"0");
  CreateWindow("STATIC","大小:",WS_VISIBLE|WS_CHILD,60,75,40,22,hWnd,NULL,hInst,NULL);
  hHeight=CreateWindow("EDIT",NULL,WS_CHILD|WS_VISIBLE|WS_BORDER|ES_NUMBER,100,75,100,22,hWnd,(HMENU)IDC_HEIGHT,hInst,NULL);
  SendMessage(hHeight,EM_LIMITTEXT,4,0);//设置最大字体高度为4位
  SetWindowText(hHeight,zero);
  CreateWindow("STATIC","字体:",WS_VISIBLE|WS_CHILD,60,100,40,22,hWnd,NULL,hInst,NULL);
  hCombo=CreateWindow("COMBOBOX",NULL,WS_CHILD|WS_VISIBLE|CBS_DROPDOWNLIST,100,100,100,400,hWnd,HMENU(IDC_COMBO),hInst,NULL);
  hlfBold=CreateWindow("BUTTON","Bold",WS_CHILD|WS_VISIBLE|BS_AUTOCHECKBOX|BS_RIGHT,
                      210,100,50,22,hWnd,(HMENU)IDC_BOLD,hInst,NULL);
  hlfItalic=CreateWindow("BUTTON","Italic",WS_CHILD|WS_VISIBLE|BS_AUTOCHECKBOX|BS_RIGHT,
                      210,125,50,22,hWnd,(HMENU)IDC_ITALIC,hInst,NULL);
  hlfUnderline=CreateWindow("BUTTON","UnderLine",WS_CHILD|WS_VISIBLE|BS_AUTOCHECKBOX|BS_RIGHT,
   210,150,88,22,hWnd,(HMENU)IDC_UNDERLINE,hInst,NULL);
  hlfStrikeOut=CreateWindow("BUTTON","StrikeOut",WS_CHILD|WS_VISIBLE|BS_AUTOCHECKBOX|BS_RIGHT,
                      210,175,80,22,hWnd,(HMENU)IDC_STRIKEOUT,hInst,NULL);
  hdc=GetDC(hWnd);
  lg.lfFaceName[0]=0;
  lg.lfCharSet=DEFAULT_CHARSET;
  EnumFontFamiliesEx(hdc,&lg,(FONTENUMPROC)myFontEnumProc,0,0);
  ReleaseDC(hWnd,hdc);
   break;
  case WM_COMMAND:
   wmId    = LOWORD(wParam);
   wmEvent = HIWORD(wParam);
   // Parse the menu selections:
   switch (wmId)
   {
   case IDC_ITALIC:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
   case IDC_BOLD:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
   case IDC_UNDERLINE:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
   case IDC_STRIKEOUT:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
   case IDC_COMBO:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
   case IDC_HEIGHT:
    InvalidateRect(hWnd,NULL,TRUE);
    break;
    case IDM_ABOUT:
       DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
       break;
    case IDM_EXIT:
       DestroyWindow(hWnd);
       break;
    default:
       return DefWindowProc(hWnd, message, wParam, lParam);
   }
   break;
  case WM_PAINT:
      char Temp[64],height[3];
   int nHeight;
   GetWindowText(hHeight,height,3);
   nHeight=atoi(height);
   hdc = BeginPaint(hWnd, &ps);
   // TODO: Add any drawing code here...
   SendMessage(hCombo,WM_GETTEXT,64,(LPARAM)Temp);
   RECT rt;
   HFONT hf;
   LOGFONT lg1;
   lg1.lfCharSet=DEFAULT_CHARSET;
   lg1.lfClipPrecision=CLIP_DEFAULT_PRECIS;
   lg1.lfEscapement=0;
   lg1.lfHeight=nHeight;
   lg1.lfOrientation=0;
   lg1.lfOutPrecision=OUT_DEFAULT_PRECIS;
   lg1.lfPitchAndFamily=NULL;
   lg1.lfQuality=DEFAULT_QUALITY;
   lg1.lfWeight=IsDlgButtonChecked(hWnd,IDC_BOLD)==BST_CHECKED?900:400;
   lg1.lfWidth=0;
   strcpy(lg1.lfFaceName,Temp);
   lg1.lfItalic=IsDlgButtonChecked(hWnd,IDC_ITALIC)==BST_CHECKED?TRUE:FALSE;
   lg1.lfStrikeOut=IsDlgButtonChecked(hWnd,IDC_STRIKEOUT)==BST_CHECKED?TRUE:FALSE;
   lg1.lfUnderline=IsDlgButtonChecked(hWnd,IDC_UNDERLINE)==BST_CHECKED?TRUE:FALSE;
   hf=CreateFontIndirect(&lg1);
            SelectObject(hdc,hf);
   GetClientRect(hWnd, &rt);
   DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
   EndPaint(hWnd, &ps);
   DeleteObject(hf);
   break;
  case WM_DESTROY:
   PostQuitMessage(0);
   break;
  default:
   return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch (message)
 {
  case WM_INITDIALOG:
    return TRUE;

  case WM_COMMAND:
   if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
   {
    EndDialog(hDlg, LOWORD(wParam));
    return TRUE;
   }
   break;
 }
    return FALSE;
}
int CALLBACK myFontEnumProc(
          ENUMLOGFONTEX *lpelfe,    // logical-font data
          NEWTEXTMETRICEX *lpntme,  // physical-font data
          DWORD FontType,           // type of font
          LPARAM lParam             // application-defined data
          )
{
     char temp[64];
  sprintf(temp,"%s",lpelfe->elfFullName);
  SendMessage(hCombo,CB_ADDSTRING,0,(LPARAM)temp);
  return 1;
}