创建新的进程并等待返回结果

创建新的进程并等待返回结果

创建新的普通进程并等待返回结果

说明：创建新的进程，等待进程返回执行结果

DWORD RunCommandProcessor(const PTCHAR pszCmd)
{
    ASSERT(NULL != pszCmd);
    STARTUPINFO si = {sizeof(STARTUPINFO)};
    si.dwFlags = STARTF_USESHOWWINDOW;
    PROCESS_INFORMATION pi = {0};

    CString strCurDir;
    (void)GetModuleFileName(NULL, strCurDir.GetBuffer(MAX_PATH), MAX_PATH - 1);
    strCurDir.ReleaseBuffer();
    strCurDir = strCurDir.Left(strCurDir.ReverseFind(_T('\\')));

    CString strCmdLine;
    strCmdLine.Format(_T("%s\\%s"), strCurDir, pszCmd);
    BOOL bRet = CreateProcess(NULL, (LPTSTR)(LPCTSTR)strCmdLine,
        NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
    DWORD dwExitCode = 0;
    if (bRet)
    {
        (void)CloseHandle(pi.hThread);
        (void)WaitForSingleObject(pi.hProcess, INFINITE);
        (void)GetExitCodeProcess(pi.hProcess, &dwExitCode);
        (void)CloseHandle(pi.hProcess);
    }
    return 0 == dwExitCode;
}

创建新的控制台进程并等待返回结果以及获得控制台输出

说明：主程序与控制台程序之间的通讯方式是内核句柄继承。

DWORD RunCommandProcessor(const PTCHAR pszCmd, CString& strOutPut)
{
    // TODO: Add your control notification handler code here
    DWORD dwRet = ERROR_INVALID_FUNCTION;

    CString strCurDir;
    (void)GetModuleFileName(NULL, strCurDir.GetBuffer(MAX_PATH), MAX_PATH - 1);
    strCurDir.ReleaseBuffer();
    strCurDir = strCurDir.Left(strCurDir.ReverseFind(_T('\\')));

    CString strCmdLine;
    strCmdLine.Format(_T("%s\\%s"), strCurDir, pszCmd);
    LOG(_T("%s"), strCmdLine);

    PROCESS_INFORMATION pi = {0};

    SECURITY_ATTRIBUTES sa = {sizeof(SECURITY_ATTRIBUTES)};
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;

    STARTUPINFO si = {sizeof(STARTUPINFO)};

    DWORD dwWaitRet = WAIT_FAILED;

    HANDLE hRead  = NULL;
    HANDLE hWrite = NULL;
    BOOL bRet = CreatePipe(&hRead, &hWrite, &sa, 0);
    if (!bRet)
    {
        goto final;
    }

    GetStartupInfo(&si);
    si.hStdError  = hWrite;
    si.hStdOutput = hWrite;
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;

    bRet = CreateProcess(NULL, (LPTSTR)(LPCTSTR)strCmdLine, NULL, NULL, TRUE, 
        NULL, NULL, NULL, &si, &pi);    // TRUE:继承父进程句柄
    if (!bRet)
    {
        goto final;
    }

    (void)CloseHandle(pi.hThread);
    dwWaitRet = WaitForSingleObject(pi.hProcess, INFINITE);
    (void)GetExitCodeProcess(pi.hProcess, &dwRet);
    (void)CloseHandle(pi.hProcess);

    // 在ReadFile之前要关掉，否则ReadFile一直等待写入
    (void)CloseHandle(hWrite);

    if (dwWaitRet == WAIT_FAILED)
    {
        goto final;
    }

    char buffer[4096] = {0};    // 没有考虑WCHAR
    DWORD bytesRead = 0;
    do 
    {
        if (ReadFile(hRead, buffer, 4096, &bytesRead, NULL))
        {
            strOutPut += buffer;
        }
        else
        {
            break;
        }
    } while (TRUE);
//  dwRet = ERROR_SUCCESS;
final:

    (void)CloseHandle(hRead);
    return dwRet;
}

应用程序关联控制台程序并显示输出

参照MSDN中的Console Functions。该组函数用于为当前进程创建一个控制台界面，具体用途不明，一般用来输出日志，但是似乎没有Debug View方便。

以输出日志为例，大致的使用方式是：
1.在‘App::InitInstance()’时调用‘AllocConsole();’分配一个控制台；
2.此时可以配置控制台，比如调用‘SetConsoleTitle(_T("Title"));’，或者其他改变控制台特性的API：‘SetConsoleWindowInfo’、‘SetCurrentConsoleFontEx’等；
3.需要向控制台写时：

HANDLE hdlWrite = GetStdHandle(STD_OUTPUT_HANDLE); //这里也可以使用STD_ERROR_HANDLE
TCHAR c[MAX_PATH] = _T("Hello world!\r\n");
BOOL bRet = WriteConsole(hdlWrite, c, _tcslen(c), NULL, NULL);
CloseHandle(hdlWrite);

4.需要从控制台读时：

TCHAR szBuffer[MAX_PATH] = {0};
DWORD dwCount = 0;
HANDLE hdlRead = GetStdHandle(STD_INPUT_HANDLE);
ReadConsole(hdlRead, szBuffer, MAX_PATH, &dwCount, NULL);
CloseHandle(hdlRead);

5.退出时：

BOOL bRet = FreeConsole();