C++ 学习 二

最新推荐文章于 2017-10-10 16:52:57 发布

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本文详细介绍了如何使用Windows API创建窗口，并通过事件处理实现简单的窗口交互功能，包括字符输入、鼠标点击和文本显示。同时，还提供了一个递归函数的例子，展示了其在编程中的应用。

1. 利用windows api 创建窗口

正确代码示例：

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

LRESULT CALLBACK WindowLiProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow
)
{
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_WINLOGO);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WindowLiProc;
wndcls.lpszClassName="CheersLi01";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls);
HWND hwnd;
hwnd=CreateWindow("CheersLi01","Cheers Li Api 学习",WS_OVERLAPPEDWINDOW,0,0,800,600,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 WindowLiProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
LPARAM lParam)
{
switch(uMsg)
{
case WM_CHAR :
   char szChar[20];
   sprintf(szChar,"Char is %d",wParam);
   MessageBox(hwnd,szChar,"CheersLi01",0);
   break;
case WM_LBUTTONDOWN :
   MessageBox(hwnd,"mouse click","CheersLi01",0);
   HDC hdc;
   hdc=GetDC(hwnd);
   TextOut(hdc,0,50,"我的C++学习",ARRAYSIZE("我的C++学习"));
   ReleaseDC(hwnd,hdc);
case WM_PAINT :
   HDC hDc;
   PAINTSTRUCT ps;
   hDc=BeginPaint(hwnd,&ps);
   TextOut(hDc,0,50,"C++ Programming",ARRAYSIZE("C++ Programming"));
   EndPaint(hwnd,&ps);
   break;
case WM_CLOSE :
   if(IDYES==MessageBox(hwnd,"是否真的结束？","Hints for you",MB_YESNO))
   {
    DestroyWindow(hwnd);
   }
   break;
case WM_DESTROY :
   PostQuitMessage(0);
   break;
default:
   return DefWindowProc(hwnd,uMsg,wParam,lParam);
}