《win32汇编》时钟之C代码

#include <Windows.h>
#include <math.h>
#include "resource.h"
#define PI 3.1415976/180
int dwCenterX,dwCenterY,dwRadius;
const TCHAR *szAppName=TEXT("Clock");
LRESULT CALLBACK ProcWinMain(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
void ShowTime(HWND hwnd,HDC hdc);
void CalcClockParam(HWND hwnd);
void DrawDot(HDC hdc,int dwDegreeInc,int dwSmallRadius);
int CalX(double dwNowDegreen,int dwR);
int CalY(double dwNowDegreen,int dwR);
void DrawLine(HDC hdc,double dwDegreen,int dwRadiusAdjust);
int WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in_opt LPSTR lpCmdLine, __in int nShowCmd )
{
WNDCLASS wc;
MSG msg;
HWND hwnd;
RtlZeroMemory(&wc,sizeof(WNDCLASS));
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor=LoadCursor(hInstance,IDC_ARROW);
wc.hIcon=LoadIcon(hInstance,MAKEINTRESOURCE(ICO_MAIN));
wc.hInstance=hInstance;
wc.lpfnWndProc=ProcWinMain;
wc.lpszClassName=szAppName;
wc.lpszMenuName=NULL;
wc.style=0;

if(!RegisterClass(&wc))
{
MessageBox(NULL,TEXT("It's required for Windows NT!"),szAppName,MB_ICONERROR);
return 0;
}
hwnd=CreateWindowEx(WS_EX_CLIENTEDGE,
szAppName,szAppName,WS_OVERLAPPEDWINDOW,
100,100,250,270,
NULL,NULL,hInstance,NULL
);
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK ProcWinMain(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_TIMER:
InvalidateRect(hwnd,NULL,TRUE);
return 0;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
ShowTime(hwnd,hdc);
EndPaint(hwnd,&ps);
return 0;
case WM_CREATE:
SetTimer(hwnd,ID_TIMER,1000,NULL);
return 0;
case WM_CLOSE:
KillTimer(hwnd,ID_TIMER);
DestroyWindow(hwnd);
PostQuitMessage(0);
retur