一个窗口的创建步骤
- 注册窗口类
- 创建窗口
- 显示窗口
- 刷新窗口
- 消息循环
- 窗口的消息处理函数
下边直接上实验代码，点击窗口关闭按钮后的一系列过程解释请直接调到代码下面！！
#pragma warning(disable:4996)
#include <stdio.h>
#include <windows.h>
//标准输出设备句柄
HANDLE hConsole;
int n;
//WM_CREATE 消息 的 处理函数
void on_create(HWND hWnd);
//6666 定时器的定时器处理函数
void timerProc();
//定时器消息处理函数
void OnTimer(WPARAM wParam);
//6 窗口的消息处理函数
LRESULT CALLBACK myWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
int WinMain(HINSTANCE hInst,
HINSTANCE hPrevInst,
char* cmd,
int show) {
//窗口类
WNDCLASSEXA wc = {
0 };
wc.cbClsExtra = NULL;
wc.cbSize = sizeof(wc);
wc.cbWndExtra = NULL;
wc.hbrBackground = NULL;
wc.hCursor = NULL;
wc.hIcon = NULL;
wc.hIconSm = NULL;
wc.hInstance = hInst;
wc.lpfnWndProc = myWndProc;
wc.lpszClassName = "强哥的窗口类";
wc.lpszMenuName = NULL;
wc.style = CS_HREDRAW | CS_VREDRAW;
//1 注册窗口类
RegisterClassEx(&wc);
//2 创建窗口
HWND hWnd = CreateWindowEx(wc.style,
wc.lpszClassName, "第一个windows窗口",
WS_OVERLAPPEDWINDOW, 100, 100, 500, 500,
NULL, NULL, hInst, NULL);
if (!hWnd)
{
return FALSE;
}
//3 显示窗口
ShowWindow(hWnd, SW_SHOW);
//4 刷新
UpdateWindow(hWnd);
#if 1
AllocConsole();
hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
n = 0;
#endif
//消息包
MSG msg;
bool ret = true;
//5 消息循环
while (ret) {
//5.1 获取消息
ret = GetMessage(&msg, NULL, 0, 0);
//5.2 翻译消息
TranslateMessage(&msg);
//5.3 派发消息
DispatchMessage(&msg);
}
MessageBox(NULL, "消息循环结束", "窗口", MB_OK);
return 0;
}
//6 窗口的消息处理函数
LRESULT CALLBACK myWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
#if 1
//MessageBox(hWnd, "欢迎一生平安", "什么梅", MB_OK);
n++;
char buff[256] = {
0 };
sprintf(buff, "第%d个消息\n", n);
DWORD writenLen = 0;
WriteConsole(hConsole, buff, strlen(buff), &writenLen, NULL);
#endif
int r;
switch (msg)
{
case WM_TIMER:
OnTimer(wParam);
break;
case WM_COMMAND:
break;
case WM_CREATE: on_create(hWnd); break;
case WM_DESTROY:
while (1) {
r = MessageBox(NULL, "想杀我呀", "box", MB_YESNO);
if (r == IDYES) {
MessageBox(NULL, "没门", "^o^", MB_OK);
}
else if (r == IDNO) {
MessageBox(NULL, "不杀我，我自杀", "^o^", MB_OK);
//发送退出消息
//ShowWindow(hWnd, SW_SHOW);
break;
}
}
break;
case WM_NCDESTROY:
while (1) {
r = MessageBox(NULL, "hhhe，我还在哦", "box", MB_YESNO);
if (r == IDYES) {
MessageBox(NULL, "没门", "^o^", MB_OK);
}
else if (r == IDNO) {
MessageBox(NULL, "拜拜了你勒~", "^o^", MB_OK);
/*PostQuitMessage(0);*///发送退出消息
//ShowWindow(hWnd, SW_SHOW);
break;
}
}
case WM_QUIT:
while (1) {
r = MessageBox(NULL, "嘎嘎嘎，表哥我又出来了哦~", "box", MB_YESNO);
if (r == IDYES) {
MessageBox(NULL, "嘻嘻，使不得哦~", "^o^", MB_OK);
}
else if (r == IDNO) {
MessageBox(NULL, "表哥我回去了哦~", "^o^", MB_OK);
//PostQuitMessage(0);//发送退出消息
//ShowWindow(hWnd, SW_SHOW);
break;
}
}
#if 1
case WM_CLOSE:
SetWindowPos(hWnd, HWND_TOPMOST, 50, 50, 300, 300, NULL);
MessageBox(NULL, "想关闭我呀", "box", MB_YESNO);
break;
#endif
default:
break;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
//WM_CREATE 消息 的 处理函数
void on_create(HWND hWnd) {
#if 1
MessageBox(hWnd, "窗口创建成功!", "什么梅", MB_OK);
char buff[256] = {
0 };
sprintf(buff, "窗口创建成功!\n", n);
WriteConsole(hConsole, buff, strlen(buff), NULL, NULL);
#endif
//SetTimer(hWnd, 6666, 1000, (TIMERPROC)timerProc);//回调函数
SetTimer(NULL, 8888, 1000, NULL);//定时器消息
SetTimer(NULL , 9999, 1000, NULL);//定时器消息
}
//6666 定时器的定时器处理函数
void timerProc() {
static int num = 0;
char buff[256] = {
0 };
sprintf(buff, "定时器6666:%d次调用!\n", num++);
WriteConsole(hConsole, buff, strlen(buff), NULL, NULL);
}
//定时器消息处理函数
void OnTimer(WPARAM wParam) {
char buff[256] = {
0 };
switch (wParam) {
case 8888:
sprintf(buff, "定时器消息处理函数：%u!\n", wParam);
WriteConsole(hConsole, buff, strlen(buff), NULL, NULL);
break;
case 9999:
sprintf(buff, "定时器消息处理函数：%u!\n", wParam);
WriteConsole(hConsole, buff, strlen(buff), NULL, NULL);
break;
}
}
知识点：
-
当点击右上角关闭按钮是就会产生VM_CLOSE这个消息，如果不自己return 而是用系统默认的窗口处理函数DefWindowProc()函数，这个函数自己会发送一系列消息VM_CLOSE–>VM_DESTROY–>VM_NCDESTROY–>VM_QUIT–>VM_CLOSE–>程序结束(上边代码运行证明了过程，可以自己copy运行一下)
-
如果直接在VM_CLOSE紧接着使用PostWindowProc（0）；会出现问题，正确用法是将PostWindowProc(0)放在VM_DESTROY消息里使用,这个函数被调用后会产生一个VM_QUIT的消息，这个消息无法被捕获，并且返回值是0，循环就会结束了。