WindowDraw.cpp

复制代码 代码如下:

/*简单的使用dc画笔画出直线，矩形，椭圆*/

#include<Windows.h>

#include<tchar.h>

//声明窗口函数

LRESULT CALLBACK WindowProc (

HWND hwnd,

UINT uMsg,

WPARAM wParam,

LPARAM lParam

);

//入口函数WinMain

int WINAPI WinMain(

HINSTANCE hInstance,

HINSTANCE hPrevInstance,

LPSTR lpCmdLine,

int nCmdShow

)

{

//定义窗口类

WNDCLASS wndclass;

wndclass.lpfnWndProc=WindowProc;//指定窗口函数

wndclass.cbClsExtra=0;

wndclass.cbWndExtra=0;

wndclass.style=CS_HREDRAW|CS_VREDRAW;

wndclass.lpszClassName=_T("我的窗体");

wndclass.hInstance=hInstance;

wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);//获取标准鼠标光标

wndclass.hIcon=0;

wndclass.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);

wndclass.lpszMenuName=0;

//注册窗口类

if(RegisterClass(&wndclass)==0)

{

MessageBox(0,_T("注册窗口类失败"),_T("我的窗体"),MB_OK);

return 0;

}

//创建窗体实列

HWND hWnd = CreateWindow(_T("我的窗体"),_T("窗体绘图"),WS_OVERLAPPEDWINDOW,100,100,500,400,0,0,hInstance,0);

//显示和更新窗体

ShowWindow(hWnd,SW_SHOW);

UpdateWindow(hWnd);

//消息循环

MSG msg;

while(GetMessage(&msg,0,0,0))

{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

return 0;

}

//定义窗口函数

LRESULT CALLBACK WindowProc (

HWND hwnd,

UINT uMsg,

WPARAM wParam,

LPARAM lParam

)

{

switch(uMsg)

{

case WM_PAINT://响应绘图消息

{

PAINTSTRUCT ps;

//获得DC

HDC hDC = BeginPaint(hwnd,&ps);

//创建实线，宽度为1，红色的笔

HPEN hPen=CreatePen(PS_SOLID,1,RGB(255,0,0));

//将笔选入DC

HPEN hOldPen=(HPEN)SelectObject(hDC,hPen);

//绘制红色的直线

MoveToEx(hDC,10,10,NULL);

LineTo(hDC,90,50);

//创建一个蓝色的刷子

HBRUSH hBrush = CreateSolidBrush(RGB(0,0,255));

HBRUSH hOldBrush= (HBRUSH)SelectObject(hDC,hBrush);

//绘制矩形，因为笔没有换，所以绘制的是红色边框，蓝色区域的矩形

Rectangle(hDC,100,100,200,170);

//绘制椭圆，因为笔和刷子都没换，所以绘制的是红色的边框，蓝色区域的椭圆

Ellipse(hDC,200,230,260,300);

//输出文字

TextOut(hDC,200,30,_T("绘图测试"),4);

//恢复绘图对象

SelectObject(hDC,hOldPen);

SelectObject(hDC,hOldBrush);

//删除绘图对象

DeleteObject(hPen);

DeleteObject(hBrush);

//释放DC

EndPaint(hwnd,&ps);

}

break;

case WM_CLOSE:

PostQuitMessage(0);

break;

default:

return DefWindowProc(hwnd,uMsg,wParam,lParam);

}

return 0;

}