7月 / 2015 / MITGAI`S THINKING

传入值和对于功能

EWX_HYBRID_SHUTDOWN（0x00400000）
从 Windows8 开始的混合关机模式。
Beginning with Windows 8: You can prepare the system for a faster startup by combining the EWX_HYBRID_SHUTDOWN flag with the EWX_SHUTDOWN flag.

EWX_LOGOFF（0）
关闭所有进程并注销。
Shuts down all processes running in the logon session of the process that called the ExitWindowsEx function. Then it logs the user off.

EWX_POWEROFF（0x00000008）
关闭系统并切断电源，系统支持电源关闭功能。
Shuts down the system and turns off the power. The system must support the power-off feature.

EWX_REBOOT（0x00000002）
关闭系统并重启。
Shuts down the system and then restarts the system.

EWX_RESTARTAPPS（0x00000040）
关闭系统并重启，被注册到重启项的应用将一起重启。
Shuts down the system and then restarts it, as well as any applications that have been registered for restart using the RegisterApplicationRestart function.

EWX_SHUTDOWN（0x00000001）
关闭系统并在安全状态下关闭电源。
Shuts down the system to a point at which it is safe to turn off the power. All file buffers have been flushed to disk, and all running processes have stopped.
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在 Windows 下，如果要获取打开的某个前台窗口所对应的后台进程名，是没有现成的函数的。但是这并不是意味着我们不能利用微软提供的其他API来实现该功能。
其中一种实现思路就是：
1.利用GetWindowThreadProcessId获取创建指定窗口线程的标识和创建窗口的进程的标识符；
2.利用CreateToolhelp32Snapshot和Process32First建立系统中全部进程的快照并获取进程信息；
3.然后使用该函数得到的进程ID号，在快照信息中进行匹配，匹配到相应的进程，输出进程名。

通过进程号获取进程名

LPWSTR GetProcessNameById(DWORD ProcessID)
{
    HANDLE hProcessSnap;
    PROCESSENTRY32 pe32;
    LPWSTR result = new WCHAR[32];

    //获取系统中全部进程的快照 Take a snapshot of all processes in the system.
    hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (INVALID_HANDLE_VALUE == hProcessSnap) return(FALSE);

    pe32.dwSize = sizeof(PROCESSENTRY32);

    // 获取第一个进程的信息 Retrieve information about the first process,
    // 若获取失败则退出 and exit if unsuccessful
    if (!Process32First(hProcessSnap, &pe32))
    {
        // 清除快照 clean the snapshot object
        CloseHandle(hProcessSnap);
        printf("!!! Failed to gather information on system processes! \n");
        return(NULL);
    }

    //匹配进程ID Matching Process ID
    do
    {
        if (ProcessID == pe32.th32ProcessID)
        {
            //拷贝进程名 Copy Process Name
            wcscpy(result, (LPWSTR)pe32.szExeFile);
            break;
        }
    } while (Process32Next(hProcessSnap, &pe32));

    // 清除快照 clean the snapshot object
    CloseHandle(hProcessSnap);

    return result;
}

LPWSTR GetProcessNameById(DWORD ProcessID)

{

HANDLE hProcessSnap;

PROCESSENTRY32 pe32;

LPWSTR result = new WCHAR[32];

//获取系统中全部进程的快照 Take a snapshot of all processes in the system.

hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

if (INVALID_HANDLE_VALUE == hProcessSnap) return(FALSE);

pe32.dwSize = sizeof(PROCESSENTRY32);

// 获取第一个进程的信息 Retrieve information about the first process,

// 若获取失败则退出 and exit if unsuccessful

if (!Process32First(hProcessSnap, &pe32))

{

// 清除快照 clean the snapshot object

CloseHandle(hProcessSnap);

printf("!!! Failed to gather information on system processes! \n");

return(NULL);

}

//匹配进程ID Matching Process ID

{

if (ProcessID == pe32.th32ProcessID)

{

//拷贝进程名 Copy Process Name

wcscpy(result, (LPWSTR)pe32.szExeFile);

break;

}

} while (Process32Next(hProcessSnap, &pe32));

// 清除快照 clean the snapshot object

CloseHandle(hProcessSnap);

return result;

}

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MITGAI`S THINKING

//Coding Life.

Monthly Archives: 7月 2015

Windows 下用 API 控制系统的锁定/注销/重启/关机

ExitWindowsEx函数原型

传入值和对于功能

Windows 下根据进程ID获取进程名

通过进程号获取进程名