#include "windows.h"
#include "stdio.h"
//定義窗口過(guò)程函數(shù)；
LRESULT CALLBACK MyWndProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);
int WINAPI WinMain(
HINSTANCE hInstance, // handle to current instance
HINSTANCE hPrevInstance, // handle to previous instance
LPSTR lpCmdLine, // pointer to command line
int nCmdShow // show state of window
)
{
//設(shè)計(jì)一個(gè)窗口類(lèi)；
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_ARROW);
wndcls.hIcon=LoadIcon(NULL,IDI_INFORMATION);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=MyWndProc;
wndcls.lpszClassName="Bacoo";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_VREDRAW | CS_HREDRAW;
//注冊(cè)窗口類(lèi)；
RegisterClass(&wndcls);
//創(chuàng)建窗口；
HWND hwnd;
hwnd=CreateWindow("Bacoo","A Simple SingleDocument derived from own code",
WS_OVERLAPPEDWINDOW,0,0,600,400,
NULL,NULL,hInstance,NULL);
//顯示及更新窗口。
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
//消息循環(huán)
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
//簡(jiǎn)單的說(shuō)，函數(shù)TranslateMessage就是把WM_KEYDOWN和WM_KEYUP翻譯成WM_CHAR消息，沒(méi)有該函數(shù)就不能產(chǎn)生WM_CHAR消息。
TranslateMessage(&msg);
::DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK MyWndProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
)
{
switch(uMsg)
{
case WM_CHAR:
char buf[20];
sprintf(buf,"char is %d",wParam);
MessageBox(hwnd,buf,"bacoo",0);
break;
case WM_LBUTTONDOWN:
//GetDC和ReleaseDC是一對(duì)，只要不是響應(yīng)WM_PAINT消息，都用這一對(duì)函數(shù)。
MessageBox(hwnd,"mouse clicked","bacoo",0);
HDC hdc;
hdc=GetDC(hwnd);
TextOut(hdc,0,50,"I'm Bacoo",strlen("I'm Bacoo"));
ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
//BeginPaint和EndPaint也是一對(duì)，它們只用在響應(yīng)WM_PAINT消息中。
HDC hdc2;
PAINTSTRUCT ps;
hdc2=BeginPaint(hwnd,&ps);
TextOut(hdc2,0,0,"Hello",strlen("Hello"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
//把常量放在前面可以防止誤寫(xiě)為“=”時(shí)產(chǎn)生的錯(cuò)誤，這是一個(gè)很不錯(cuò)的小技巧
if(IDYES==MessageBox(hwnd,"Are you ready to close this window?","Bacoo",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
//注意：這里必須使用return DefWindowProc(hwnd,uMsg,wParam,lParam);而不能僅僅使用DefWindowProc(hwnd,uMsg,wParam,lParam);
//否則窗口不能正確顯示，其實(shí)該回調(diào)函數(shù)的返回值表征了消息相應(yīng)的結(jié)果，因此是有意義的，不能一概返回0。
LRESULT lr=DefWindowProc(hwnd,uMsg,wParam,lParam);
// if(lr!=NULL)
// {
// MessageBox(NULL,"NULL!=DefWindowProc(hwnd,uMsg,wParam,lParam)","Try",0);
// PostQuitMessage(0);
// }
return lr;
}
return 0;
}