win32 时钟

最新推荐文章于 2015-07-24 17:08:43 发布

原创最新推荐文章于 2015-07-24 17:08:43 发布 · 518 阅读

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这篇博客展示了如何使用Win32 API在Windows平台上创建一个动态时钟应用。通过WinMain函数注册窗口类，WndProc消息处理函数绘制时钟圆盘，并在独立线程中更新时针位置，实现时钟的动画效果。代码使用了数学函数计算时针角度并绘制直线表示时钟的运动。

#include <windows.h>
#include <math.h>
#include <process.h>

#define TWO_PI (3.1415926)

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
VOID WINAPI ThreadPionter(PVOID param);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow){
static TCHAR szAppName[] = TEXT("Ball");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hInstance = hInstance;
wndclass.lpfnWndProc = WndProc;
wndclass.lpszClassName = szAppName;
wndclass.lpszMenuName = NULL;
wndclass.style = CS_HREDRAW | CS_VREDRAW;

if(!RegisterClass(&wndclass)){
MessageBox(NULL,TEXT("WIN NT!"),szAppName,MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName,TEXT("Big Ball"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,iCmdShow);
UpdateWindow(hwnd);

HANDLE Thread = (HANDLE)_beginthread((void(__cdecl*)(void*))ThreadPionter,0,&hwnd);
while(GetMessage(&msg,NULL,NULL,NULL)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return msg.wParam;
}

static int xTemp,yTemp;

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam){
static int cxClient,cyClient;
HDC hdc;
PAINTSTRUCT ps;

switch(message){
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
xTemp = cxClient/2;
yTemp = cyClient/2;
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
Ellipse(hdc,xTemp-200,yTemp-200,xTemp+200,yTemp+200);
//MoveToEx(hdc,xTemp,yTemp,NULL);
//LineTo(hdc,(int)xTemp+190*cos(TWO_PI*3/2),(int)yTemp+190*sin(TWO_PI*3/2));
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}

VOID WINAPI ThreadPionter(PVOID param){
double x=TWO_PI*3/2,y=TWO_PI*3/2;
HWND *hwnd = (HWND*) param;
HDC hdc = GetDC(*hwnd);
MoveToEx(hdc,xTemp,yTemp,NULL);
LineTo(hdc,(int)xTemp+190*cos(TWO_PI*3/2),(int)yTemp+190*sin(TWO_PI*3/2));
ReleaseDC(*hwnd,hdc);
while(1){
Sleep(1000);
//MessageBox(NULL,TEXT("111"),NULL,MB_OK);
HDC hdc = GetDC(*hwnd);
MoveToEx(hdc,xTemp,yTemp,NULL);
SelectObject(hdc,CreatePen(0,0,RGB(255,255,255)));
LineTo(hdc,(int)xTemp+190*cos(x),(int)yTemp+190*sin(y));
SelectObject(hdc,CreatePen(0,0,RGB(0,0,0)));
MoveToEx(hdc,xTemp,yTemp,NULL);
x+=(TWO_PI/30);
y+=(TWO_PI/30);
LineTo(hdc,(int)xTemp+190*cos(x),(int)yTemp+190*sin(y));
ReleaseDC(*hwnd,hdc);
}
}