问一个简单的Timer多线程时候的菜鸟级问题 :)
UINT ComputeThreadProc(LPVOID pParam)
{
volatile int nTemp;
for (g_nCount = 0; g_nCount < Dlg::nMaxCount; g_nCount++){
//::InterlockedIncrement((long*) &g_nCount)) {
for (nTemp = 0; nTemp < 10000; nTemp++) {
// uses up CPU cycles
}
}
// ::PostMessage((HWND) pParam, WM_THREADFINISHED, 0, 0);
g_nCount = 0;
return 0; // ends the thread
}
void Dlg::OnStart()
{
m_nTimer = SetTimer(1, 100, NULL); // 1/10 second
//ASSERT(m_nTimer != 0);
GetDlgItem(IDC_START)->EnableWindow(FALSE);
AfxBeginThread(ComputeThreadProc, GetSafeHwnd(),
THREAD_PRIORITY_NORMAL);
}
void Dlg::OnTimer(UINT nIDEvent)
{
CProgressCtrl* pBar = (CProgressCtrl*) GetDlgItem(IDC_PROGRESS1);
pBar->SetPos(g_nCount * 100 / nMaxCount);
}
1. 请问为什么只是在主线程定义了一个Timer, 并没有消息循环, Timer怎么的知道消息到达进行调用的呢?
2. ::InterlockedIncrement((long*) &g_nCount)) 这句是什么意思呢?....
3. // ::PostMessage((HWND) pParam, WM_THREADFINISHED, 0, 0); 如何将WM_THREADFINISHED映射到它的实现函数?
LRESULT CComputeDlg::OnThreadFinished(WPARAM wParam, LPARAM lParam)
{
CDialog::OnOK();
return 0;
}
谢谢各位老鸟相助, 不胜感激!