視窗的建立

建立一個完整的視窗需要經過下面四個操作步驟：

1. 設計一個視窗類；

2. 註冊視窗類；

3. 建立視窗；

4. 顯示及更新視窗。

設計視窗類

typedef struct _WNDCLASS { 
   UINT        style; 
   WNDPROC    lpfnWndProc; 
   int         cbClsExtra; 
   int         cbWndExtra; 
   HANDLE     hInstance; 
   HICON       hIcon; 
   HCURSOR     hCursor; 
   HBRUSH      hbrBackground; 
   LPCTSTR     lpszMenuName; 
   LPCTSTR     lpszClassName;  
} WNDCLASS; 
 

lpfnWndProc：回撥函式

HICON：圖示

HCURSOR：游標

HBRUSH：畫刷（影響背景顏色）

LPCTSTR：選單的名字

LPCTSTR：名字

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   //
 
 second message parameter
);

int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
    WNDCLASS wndcls;
    wndcls.cbClsExtra
 
=0;
    wndcls.cbWndExtra=0;
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
    wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
    wndcls.hInstance=hInstance;
    wndcls.lpfnWndProc=WinSunProc;
    wndcls.lpszClassName="Weixin2003";
    wndcls.lpszMenuName=NULL;
    wndcls.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd=CreateWindow("Weixin2003","北京維新科學技術培訓中心",WS_OVERLAPPEDWINDOW,
        0,0,600,400,NULL,NULL,hInstance,NULL);

    ShowWindow(hwnd,SW_SHOWNORMAL);
    UpdateWindow(hwnd);

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

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
    switch(uMsg)
    {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar,"char is %d",wParam);
        MessageBox(hwnd,szChar,"weixin",0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","weixin",0);
        HDC hdc;
        hdc=GetDC(hwnd);
        TextOut(hdc,0,50,"計算機程式語言培訓",strlen("計算機程式語言培訓"));
        ReleaseDC(hwnd,hdc);
        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,0,0,"維新培訓",strlen("維新培訓"));
        EndPaint(hwnd,&ps);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(hwnd,"是否真的結束？","weixin",MB_YESNO))
        {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}

認識 CreateWindow 函式