to y9y:
不好意思，那个程序我大二时当作业给交了，老师至今未还！：（
不过我这里有个线程的例子，我当时是从这个例子受启发
编出来的。不知对你有没有帮助：
一个MDI的程序
typedef struct{
HWND hWnd;
BOOL *lpKillThread;
} THREAD_INFO;
在CVIEW中生成线程：
void CThreadDemo1View::OnDraw(CDC* pDC)
{
....
// Store the window handle and the Kill flag.
m_ThreadInfo.hWnd = m_hWnd;//m_hWnd即相当于canvas.handel
m_ThreadInfo.lpKillThread = &m_bKillThread;
// Start the thread.//用于控制线程终止
m_pThread =
AfxBeginThread(ThreadProc, (LPVOID) &m_ThreadInfo);
}
线程中通过句柄来在窗口中画图(用线拼成的花在开放的动画）
UINT ThreadProc( LPVOID lpParam )
{
// Get a THREAD_INFO pointer from the
// parameter that was passed in.
THREAD_INFO *lpThreadInfo =
(THREAD_INFO *) lpParam;
// The next six variables represent
// values used to draw the spirograph;
unsigned char Red, Green, Blue;
int nFixedRadius = 80;
int nMovingRadius = 10;
int nMovingOffset = 70;
// Begin colors based on the system time. This
// makes the color somewhat random.
Red = (unsigned char)
( GetTickCount() & 0x000000ff );
Green = (unsigned char)
( ( GetTickCount() & 0x00000ff0 ) >> 4 );
Blue = (unsigned char)
( ( GetTickCount() & 0x0000ff00 ) >> 8 );
while( *lpThreadInfo->lpKillThread == FALSE ){
// Get a DC for the window.
HDC hdc = ::GetDC( lpThreadInfo->hWnd );
// Get the client rect so we can
// calculate the center point.
RECT Rect;
::GetClientRect( lpThreadInfo->hWnd, &Rect );
int nMidx = Rect.right / 2;
int nMidy = Rect.bottom / 2;
// Clear the window.
::InvalidateRect( lpThreadInfo->hWnd, NULL, TRUE );
::UpdateWindow( lpThreadInfo->hWnd );
// Create a pen based on the color. Select it
// into the DC and remember the old pen so
// we can select it back in later.
HPEN hPen, hOldPen;
hPen =
::CreatePen( PS_SOLID, 1, RGB( Red, Green, Blue ) );
hOldPen = (HPEN) ::SelectObject( hdc, hPen );
// Iterate through a bunch of times and
// draw the spirograph.
int prevx, prevy, x = 0, y = 0;
for( int i=0; i<=500; i++ ){
// Remember x and y.
prevx = x;
prevy = y;
// Calculate the new x and y.
x = (int) ( ( nFixedRadius + nMovingRadius ) *
cos( (double) i ) -
( nMovingRadius + nMovingOffset ) *
cos((double)(( ( nFixedRadius + nMovingRadius ) /
nMovingRadius ) * i ) ) );
y = (int) ( ( nFixedRadius + nMovingRadius ) *
sin( (double) i ) -
( nMovingRadius + nMovingOffset ) *
sin((double)(( ( nFixedRadius + nMovingRadius ) /
nMovingRadius ) * i ) ) );
// Draw the line (or move to the first
// point if this is the first time through).
if( i > 0 )
::LineTo( hdc, x + nMidx, y + nMidy );
else
::MoveToEx( hdc, x + nMidx, y + nMidy, NULL );
}
// Increment the color variables so
// that the colors move around.
Red += 6;
Green += 5;
Blue += 4;
// Increase the fixed radius and
// limit it to a max of 150.
nFixedRadius++;
if( nFixedRadius > 170 )
nFixedRadius = 90;
// Increase the moving radius and
// limit it to a max of 120.
nMovingRadius++;
if( nMovingRadius > 40 )
nMovingRadius = 10;
// Increase the moving offset and
// limit it to a max of 90.
nMovingOffset++;
if( nMovingOffset > 100 )
nMovingOffset = 70;
// Select the old pen into the DC,
// delete the pen we created, and
// release the DC we got.
::SelectObject( hdc, hOldPen );
:
eleteObject( hPen );
::ReleaseDC( lpThreadInfo->hWnd, hdc );
// Sleep so we don't chew up too
// much CPU time.
Sleep(100 );
}
return( 0 );
}
