【Windows编程——API】左键连线
作者:互联网
//windows.h文件中包含应用程序中所需的数据类型和数据结构的定义 #include <windows.h> #include <stdlib.h> #include <time.h> #include <string.h> #include <stdio.h> #include <math.h> #define PI acos(-1) LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//窗口函数说明 //---------以下初始化窗口类-------------- int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow) { HWND hwnd; MSG Msg; WNDCLASS wndclass; char lpszClassName[] = "窗口"; //窗口类名 char lpszTitle[] = "My_Windows"; //窗口标题名 //窗口类的定义 wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS; //窗口类型为默认类型 wndclass.lpfnWndProc = WndProc; //窗口处理函数为WndProc wndclass.cbClsExtra = 0; //窗口类无扩展 wndclass.cbWndExtra = 0; //窗口实例无扩展 wndclass.hInstance = hInstance; //当前实例句柄 wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);//窗口的最小化图标为默认图标 wndclass.hCursor = LoadCursor( NULL, IDC_ARROW); //窗口 采用箭头光标 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //窗口 背景为 白色 wndclass.lpszMenuName = NULL ; //窗口 中无菜单 wndclass.lpszClassName = lpszClassName; //窗口类名为“窗口示例” //-----------以下进行窗口类的注册 if (!RegisterClass(&wndclass))//如果注册失败则发出警吿声音 { MessageBeep (0); return FALSE; } //创建窗口 hwnd = CreateWindow( lpszClassName, //窗口类名 lpszTitle, //窗口实例的标题名 WS_OVERLAPPEDWINDOW, //窗口 的风格 CW_USEDEFAULT, CW_USEDEFAULT, //窗口左上角坐标为默认值 CW_USEDEFAULT, CW_USEDEFAULT, //窗口的髙和宽为默认值 NULL, //此窗口无父窗口 NULL, //此窗口无主菜单 hInstance, //创建此窗口应用程序的当前句柄 NULL //不使用该值 ); ShowWindow( hwnd, nCmdShow); //显示窗口 UpdateWindow(hwnd); //绘制用户区 while( GetMessage(&Msg, NULL, 0, 0)) //消息循环 { TranslateMessage(&Msg); DispatchMessage(&Msg); } return Msg.wParam; //程序终止时将信息返回系统 } LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam) { HDC hDC, hdc_old; HBITMAP hBmp, hBkBmp; RECT rect; HBRUSH hBrush; PAINTSTRUCT Ps; TEXTMETRIC tm; HFONT hf; HPEN hPen; SIZE Sz; COLORREF color[7] = {RGB(255,0,0), RGB(255,165,0), RGB(255,255,0), RGB(0,255,0), RGB(0,255,255), RGB(0,0,255), RGB(139,0,255)}; char str[150]; static int x, y, ncount; static bool isCircle = false, isRectangle = false; static POINT p[1000];//能存的点最大为1000 switch(message) { case WM_MOUSEMOVE: if (wParam & MK_LBUTTON && ncount < 1000) { p[ncount].x = MAKEPOINTS(lParam).x; p[ncount++].y = MAKEPOINTS(lParam).y; hDC = GetDC(hWnd); SetPixel(hDC, LOWORD(lParam), HIWORD(lParam), 0L); ReleaseDC(hWnd, hDC); } return 0; case WM_LBUTTONDOWN: ncount = 0; InvalidateRect(hWnd, NULL,1); return 0; case WM_LBUTTONUP: InvalidateRect(hWnd, NULL,1); return 0; case WM_PAINT: GetClientRect(hWnd,&rect); hDC = BeginPaint(hWnd, &Ps); hPen = CreatePen(PS_SOLID, 1, RGB(0,0,0)); SelectObject(hDC, hPen); for (int i = 0; i < ncount-1; i++) { MoveToEx(hDC, p[0].x, p[0].y, NULL); LineTo(hDC, p[i].x, p[i].y); } DeleteObject(hPen); EndPaint(hWnd, &Ps); //结束缓制 return 0; case WM_DESTROY: PostQuitMessage(0); return 0; default: return DefWindowProc(hWnd,message,wParam,lParam); } return 0; }
标签:窗口,Windows,hWnd,API,return,NULL,wndclass,左键,255 来源: https://www.cnblogs.com/Vikyanite/p/12641081.html