VC++深入详解-第一章学习心得(二)
前面介绍到了注册窗口，接下来进行窗口的创建，利用CreateWindow函数，结构如下
CreateWindowExW(
DWORD dwExStyle,
LPCWSTR lpClassName, //指定窗口类的名称
LPCWSTR lpWindowName, //窗口名字
DWORD dwStyle, //窗口的样式 WS_xxx
int X, //x坐标
int Y, //y坐标
int nWidth, //宽度
int nHeight, //高度
HWND hWndParent , //父窗口句柄
HMENU hMenu, //窗口菜单句柄
HINSTANCE hInstance, //窗口实例句柄
LPVOID lpParam); //大都设置为NULL
#ifdef UNICODE
#define CreateWindowEx CreateWindowExW
#else
#define CreateWindowEx CreateWindowExA
#endif // !UNICODE
窗口创建完成。接下来显示和更新窗口，结构分别如下
ShowWindow(
HWND hWnd, //创建窗口成功后返回的窗口句柄
int nCmdShow);//窗口显示的状态SW_XXXX
UpdateWindow(
HWND hWnd); //创建窗口成功后返回的窗口句柄
接下来就是消息循环了。getMessage函数，结构如下
GetMessageW(
LPMSG lpMsg, //指向MSG消息结构体
HWND hWnd , //指向窗口句柄，NULL代表接受所有的窗口信息
UINT wMsgFilterMin, //0
UINT wMsgFilterMax); //0
#ifdef UNICODE
#define GetMessage GetMessageW
#else
#define GetMessage GetMessageA
#endif // !UNICODE
使用方法如下：
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
接下来就是前面所提到的窗口过程函数，如下
LRESULT CALLBACK WinSunProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ); //窗口句柄，消息，两个附加信息
说了这么多，总结一下，窗口创建过程，就这几步骤
1.WinMain函数定义
2.设计一个窗口类
3.注册窗口类
4.创建窗口类
5.显示及更新窗口
6.进行消息寻环
7.编写窗口过程函数
下面贴上完整的代码：
#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WinSunProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ){
//设计一个窗口类
WNDCLASS wndcls;
wndcls.cbClsExtra = 0;
wndcls.cbWndExtra = 0;
wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hIcon = LoadIcon(NULL,IDI_ERROR);
wndcls.hCursor = LoadCursor(NULL,IDC_CROSS);
wndcls.hInstance = hInstance; //用用程序实例句柄由WinMain函数传过来
wndcls.lpfnWndProc = WinSunProc;
wndcls.lpszClassName = "刘凯";
wndcls.lpszMenuName = NULL;
wndcls.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls);
//创建窗口，定义一个变量用来保存成功创建窗口后返回的句柄
HWND hwnd;
hwnd = CreateWindow("刘凯","第一个窗体",
WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
//显示及刷新窗口
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
//定义消息结构体，开始循环
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
//编写窗口过程函数
LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
){
switch (uMsg)
{
case WM_CHAR :
char szChar[20];
sprintf(szChar,"char code is %d",wParam);
MessageBox(hwnd,szChar,"char",0);
break;
case WM_LBUTTONDBLCLK :
MessageBox(hwnd,"mouse clicked","message",0);
HDC hdc;
hdc = GetDC(hwnd); //不能在相应WM_PAINT消息时调用
TextOut(hdc,0,50,"程序之家",strlen("程序之家"));
break;
case WM_PAINT :
HDC hDC;
PAINTSTRUCT ps;
hDC = BeginPaint(hwnd,&ps); //BeginPaint只能在响应WM_PAINT消息时调用
TextOut(hDC,0,0,"http://www.baidu.com",strlen("http://www.baidu.com"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE :
if (IDYES == MessageBox(hwnd,"是否真的结束?","message",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY :
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}