01使用Win32 API创建、销毁线程——控制进度条

1 GetExitCodeThread

BOOL GetExitCodeThread(

HANDLE hThread,

LPDWORD lpExitCode

);

说明:获取一个已中止线程的退出代码

hThread:想获取退出代码的一个线程的句柄

lpExitCode:用于装载线程退出代码的一个长整数变量。如线程尚未中断，则设为常数STILL_ACTIVE

2 ThreadProc

DWORD WINAPI ThreadProc(LPVOID lpParameter);

说明:定义一个函数作为一个线程的起始服务地址。

lpParameter:接收CreateThread传递的参数(lpParameter)

3CreateThread

HANDLE CreateThread(

LPSECURITY_ATTRIBUTES lpThreadAttributes,

DWORD dwStackSize,

LPHREAD_START_ROUTINE lpStartAddress,

LPVOID lpParameter,

DWORD dwCreationFlags,

LPDWORD lpThreadid

);

lpThreadAttributes:指向SECURITY_ATTRIBUTES型态的结构的指针。在Windows NT中，它被设为NULL，表示使用缺省值。

dwStackSize:线程堆栈大小,一般为0，在任何情况下，Windows根据需要动态延长堆栈的大小。

lpStartAddress:指向线程函数的指针。

lpParameter:向线程函数传递的参数,是一个指向结构的指针，不需传递参数时，为NULL。

dwCreateFlags:线程标志，可取值CREATE_SUSPENDED(挂起的线程),0表示立即激活。

lpThreadid保存新线程的id

DWORD WINAPI ThreadFun(LPVOID pThread){lpthread temp=(lpthread)pThread;temp->progress->SetPos(temp->pos);while(temp->pos<20){Sleep(temp->speed);temp->pos++;temp->progress->SetPos(temp->pos);if(temp->pos==20){temp->pos=0;}}return true;}void CCreateThreadDlg::OnStart1(){// TODO: 在此添加控件通知处理程序代码DWORD ThreadID;DWORD code;thread1.progress=&m_progress1;thread1.speed=100;thread1.pos=0;if (!GetExitCodeThread(hThread1,&code)||(code!=STILL_ACTIVE)){hThread1=CreateThread(NULL,0,ThreadFun,&thread1,0,&ThreadID);//创建并开始线程}GetDlgItem(IDC_BUTTON1)->EnableWindow(TRUE);GetDlgItem(IDC_BUTTON2)->EnableWindow(FALSE);}void CCreateThreadDlg::OnStart2(){// TODO: 在此添加控件通知处理程序代码DWORD ThreadID;DWORD code;thread2.progress=&m_progress2;thread2.speed=200;thread2.pos=0;if (!GetExitCodeThread(hThread2,&code)||(code!=STILL_ACTIVE)){hThread2=CreateThread(NULL,0,ThreadFun,&thread2,0,&ThreadID);}GetDlgItem(IDC_BUTTON3)->EnableWindow(TRUE);GetDlgItem(IDC_BUTTON4)->EnableWindow(FALSE);}void CCreateThreadDlg::OnStart3(){// TODO: 在此添加控件通知处理程序代码DWORD ThreadID;DWORD code;thread3.progress=&m_progress3;thread3.speed=200;thread3.pos=0;if(!GetExitCodeThread(hThread3,&code)||(code!=STILL_ACTIVE)){hThread3=CreateThread(NULL,0,ThreadFun,&thread3,0,&ThreadID);}GetDlgItem(IDC_BUTTON5)->EnableWindow(TRUE);GetDlgItem(IDC_BUTTON6)->EnableWindow(FALSE);}void CCreateThreadDlg::OnPause1(){// TODO: 在此添加控件通知处理程序代码DWORD code;if(GetExitCodeThread(hThread1,&code)){if(code==STILL_ACTIVE){TerminateThread(hThread1,0);CloseHandle(hThread1);}}GetDlgItem(IDC_BUTTON1)->EnableWindow(FALSE);GetDlgItem(IDC_BUTTON2)->EnableWindow(TRUE);}void CCreateThreadDlg::OnPause2(){// TODO: 在此添加控件通知处理程序代码DWORD code;if(GetExitCodeThread(hThread2,&code)){if(code==STILL_ACTIVE){TerminateThread(hThread2,0);CloseHandle(hThread2);}}GetDlgItem(IDC_BUTTON3)->EnableWindow(FALSE);GetDlgItem(IDC_BUTTON4)->EnableWindow(TRUE);}void CCreateThreadDlg::OnPause3(){// TODO: 在此添加控件通知处理程序代码DWORD code;if (GetExitCodeThread(hThread3,&code)){if(code==STILL_ACTIVE){TerminateThread(hThread3,0);CloseHandle(hThread3);}}GetDlgItem(IDC_BUTTON5)->EnableWindow(FALSE);GetDlgItem(IDC_BUTTON6)->EnableWindow(TRUE);}