#include <windows.h>
class CWnd
{
public:
BOOL CreateEx(DWORD dwExStyle, // extended window style
LPCTSTR lpClassName, // registered class name
LPCTSTR lpWindowName, // window name
DWORD dwStyle, // window style
int x, // horizontal position of window
int y, // vertical position of window
int nWidth, // window width
int nHeight, // window height
HWND hWndParent, // handle to parent or owner window
HMENU hMenu, // menu handle or child identifier
HINSTANCE hInstance, // handle to application instance
LPVOID lpParam); // window-creation data
BOOL ShowWindow(int nCmdShow);
BOOL UpdateWindow();
public:
HWND m_hWnd;
};
BOOL CWnd::CreateEx(DWORD dwExStyle, // extended window style
LPCTSTR lpClassName, // registered class name
LPCTSTR lpWindowName, // window name
DWORD dwStyle, // window style
int x, // horizontal position of window
int y, // vertical position of window
int nWidth, // window width
int nHeight, // window height
HWND hWndParent, // handle to parent or owner window
HMENU hMenu, // menu handle or child identifier
HINSTANCE hInstance, // handle to application instance
LPVOID lpParam) // window-creation data
{
m_hWnd=::CreateWindowEx(dwExStyle,lpClassName,lpWindowName,dwStyle,
x,y,nWidth,nHeight,hWndParent,hMenu,hInstance,lpParam);
if(m_hWnd!=NULL)
return TRUE;
else
return FALSE;
}
BOOL CWnd::ShowWindow(int nCmdShow)
{
return ::ShowWindow(m_hWnd,nCmdShow);
}
BOOL CWnd::UpdateWindow()
{
return ::UpdateWindow(m_hWnd);
}
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, // command line
int nCmdShow // show state
)
{
WNDCLASS MyWnd;
MyWnd.cbClsExtra = NULL;
MyWnd.cbWndExtra = NULL;
MyWnd.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
MyWnd.hCursor = LoadCursor(NULL, IDC_ARROW);
MyWnd.hIcon = LoadIcon(NULL, IDI_APPLICATION);
MyWnd.hInstance = hInstance;
MyWnd.lpfnWndProc = MyWndProc;
MyWnd.lpszClassName = "Hello";
MyWnd.lpszMenuName = NULL;
MyWnd.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&MyWnd);
CWnd wnd;
wnd.CreateEx(0,"Hello","CWnd", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);
wnd.ShowWindow(SW_SHOWNORMAL);
wnd.UpdateWindow();
MSG msg;
while (GetMessage(&msg,NULL,0,0)) //??????????
{
TranslateMessage(&msg); //????
//4.????
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_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
// 在窗口中心绘制"Hello, World!"
RECT rect;
GetClientRect(hwnd, &rect);
const char* text = "Hello, World!";
DrawText( hdc,text, -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER );
EndPaint(hwnd, &ps);
break;
}
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON) // 左键拖拽时绘制
{
// 记录轨迹点...
InvalidateRect(hwnd, NULL, FALSE);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
} 拓展各种功能，尽可能多
本文介绍了Windows编程中常用的两种资源句柄：hwnd（窗口句柄）和HINSTANCE（应用程序实例句柄）。这两种句柄用于标识特定的系统资源，并在Windows API调用中广泛使用。
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