c++在Windows系统下编写计算机程序
#include <windows.h>LRESULT WINAPI WinProc(HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam);//函数声明
//主函数
RECT rect;
HDC hDC;
PAINTSTRUCT paint;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
char *cName = "myWindow";//定义个字符指针表示窗口类的名字
WNDCLASS wc;//定义变量
HWND hWnd;
MSG Msg;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);;//设置窗口背景为白色
wc.hCursor = NULL;//窗口的光标不设置
wc.hIcon = NULL;//窗口图标设置
wc.hInstance = hInstance;//当前程序的句柄，hInstance是由主函数传递
wc.lpfnWndProc = WinProc;//窗口处理过程的窗口函数。
wc.lpszClassName =cName;//窗口类的名字。
wc.lpszMenuName = NULL;//目录名，不设置
wc.style = CS_HREDRAW | CS_VREDRAW; //窗口类的风格
RegisterClass(&wc);//在系统中注册窗口
hWnd = CreateWindow( //创建窗口
cName, //窗口类名
"窗口的标题", //窗口标题
WS_OVERLAPPEDWINDOW, //窗口的风格
10, //窗口初始显示位置x
20, //窗口初始显示位置y:
330, //窗口的宽度:
350, //窗口的高度:
NULL, //父窗口:无
NULL, //子菜单:无
hInstance, //该窗口应用程序的实例句柄
NULL //
) ;
ShowWindow(hWnd,nShowCmd);//显示窗口
//对消息的循环处理
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);//翻译消息
DispatchMessage(&Msg);//分派消息
}
return Msg.message;//程序结束后返回消息
}
//窗口函数
LRESULT WINAPI WinProc(HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam)
{//处理消息过程
static HWND btnHwnd ;
static HWND inputHwnd ;
switch(Msg)//对消息进行判断
{
case WM_PAINT:
hDC=BeginPaint(hWnd,&paint);//获取设备上下文
rect.left=10;
rect.top=20;//设置矩形框的属性
rect.right=80;
rect.bottom=40;
DrawText(hDC,NULL,-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
EndPaint(hWnd,&paint);
return 0;
case WM_CREATE: //响应窗口的创建事件
//创建按钮
btnHwnd = CreateWindow( "button", "MC",WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,10, 60, 40, 30,hWnd, (HMENU)1,(HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ),NULL ) ;
btnHwnd = CreateWindow( "button", "MR",WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,70, 60, 40, 30,hWnd, (HMENU)1,(HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ),NULL ) ;
btnHwnd = CreateWindow( "button", "MS", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,130,60, 40, 30,hWnd, (HMENU)1,(HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ),NULL ) ;
btnHwnd = CreateWindow( "button", "MS", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,190, 60, 40, 30,hWnd, (HMENU)1,(HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ),NULL ) ;
btnHwnd = CreateWindow( "button", "M-", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 250, 60,40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "←",WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 100, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "CE", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 70, 100, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "C", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 130, 100, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "±", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,190, 100, 40, 30,hWnd, (HMENU)1,(HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "√", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,250, 100, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "7", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 140, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "8", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 70, 140, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "9", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,130, 140, 40, 30,hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "/", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 190, 140, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "%", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 250, 140, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "4", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 180, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "5", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 70, 180, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "6", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 130, 180, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "*", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 190, 180, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "1/X", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 250, 180, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "1", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 220, 40, 30, hWnd, (HMENU)3, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "2", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 70, 220, 40, 30, hWnd, (HMENU)4, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "3", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 130, 220, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "-", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 190, 220, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "=", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 250, 220, 40, 70, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "0", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 260, 100, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", ".", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 130,260, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
btnHwnd = CreateWindow( "button", "+", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 190, 260, 40, 30, hWnd, (HMENU)1, (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE ), NULL ) ;
//创建文本框
inputHwnd = CreateWindow( "edit", "0",WS_CHILD | WS_VISIBLE | WS_BORDER |ES_RIGHT | ES_MULTILINE ,10, 20, 280, 30,hWnd,(HMENU)2,((LPCREATESTRUCT) lParam) -> hInstance, NULL ) ;
return 0 ;
case WM_COMMAND://响应命令
{
switch(LOWORD(wParam))
{
/*这里不会*/
}
return 0;
}
case WM_DESTROY://如果是点击关闭窗口时的消息
PostQuitMessage(0);//退出消息队列
return 0;//返回0，结束函数
}
//如果是其余的消息，调用默认消息处理函数，将消息该函数处理并将返回值返回
return DefWindowProc(hWnd,Msg,wParam,lParam);
}
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