VC++学习笔记(1)

今天开始学习VC++,照着书上写了几个Win32的程序。

1，#include <windows.h>


LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam,LPARAM lParam)
{
    HDC hdc;//设备环境句柄
    PAINTSTRUCT ps;

    RECT rect;
    POINT point;

    switch(iMsg)
    {
    case WM_PAINT:
        {
            hdc = BeginPaint(hwnd,&ps);
            GetClientRect(hwnd,&rect);
            DrawText(hdc,"Hello,VC6.0!",-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
            EndPaint(hwnd,&ps);
            return 0;
        }
    case WM_LBUTTONDOWN:
        {
            hdc = GetDC(hwnd);
            point.x = LOWORD(lParam);
            point.y = HIWORD(lParam);
            Ellipse(hdc,point.x-50,point.y-50,point.x+50,point.y+50);
            ReleaseDC(hwnd,hdc);
            return 0;
        }
    case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    }
        return DefWindowProc(hwnd,iMsg,wParam,lParam);

}

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
    static char szAppName[] = "HelloWin32";//应用程序名
    HWND hwnd;//窗口句柄
    MSG    msg;//消息
    WNDCLASSEX wndclass;//窗口类
    wndclass.cbSize = sizeof(wndclass);//窗口类结构的大小
    wndclass.style = CS_HREDRAW|CS_VREDRAW;//类风格：水平和垂直方向重画
    wndclass.lpfnWndProc = WndProc;//窗口过程
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszClassName = szAppName;
    wndclass.lpszMenuName = NULL;
    wndclass.hIconSm = LoadIcon(NULL,IDI_APPLICATION);

    RegisterClassEx(&wndclass);

    hwnd=CreateWindow(szAppName,
                      "The Hello App",
                      WS_OVERLAPPEDWINDOW,
                      CW_USEDEFAULT,
                      CW_USEDEFAULT,
                      CW_USEDEFAULT,
                      CW_USEDEFAULT,
                      NULL,
                      NULL,
                      hInstance,
                      NULL);
    ShowWindow(hwnd,nShowCmd);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

 

2，//t1.h
class CMyApp:public CWinApp
{
public:
    virtual BOOL InitInstance();
};

class CMainWindow:public CFrameWnd
{
public:
    CMainWindow();
protected:
    afx_msg void OnPaint();
    afx_msg void OnLButtonDown(UINT nFlags,CPoint point);
    DECLARE_MESSAGE_MAP()
};

//t1.cpp
#include <afxwin.h>
#include "t1.h"

CMyApp myApp;

BOOL CMyApp::InitInstance()
{
    this->m_pMainWnd = new CMainWindow;
    this->m_pMainWnd->ShowWindow(this->m_nCmdShow);
    this->m_pMainWnd->UpdateWindow();
    return TRUE;
}

BEGIN_MESSAGE_MAP(CMainWindow,CFrameWnd)
    ON_WM_PAINT()
    ON_WM_LBUTTONDOWN()
END_MESSAGE_MAP()

CMainWindow::CMainWindow()
{
    Create(NULL,_T("The MFC Application"));
}

void CMainWindow::OnPaint()
{
    CPaintDC dc(this);
    CRect rect;
    GetClientRect(&rect);
    dc.DrawText("Weclome to VC!!",-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);

}

void CMainWindow::OnLButtonDown(UINT nFlags,CPoint point)
{
    CClientDC dc(this);
    CRect rect(point.x-50,point.y-50,point.x+50,point.y+50);
    dc.Ellipse(rect);
}