问如何使用CreateProcess()和CreatePipe()从cmd.exe读取输出

EN

#include 
#include 
#include 

#define BUFFSZ 4096

HANDLE g_hChildStd_IN_Rd = NULL;
HANDLE g_hChildStd_IN_Wr = NULL;
HANDLE g_hChildStd_OUT_Rd = NULL;
HANDLE g_hChildStd_OUT_Wr = NULL;

int wmain(int argc, wchar_t* argv[]) 
{
    int result;
    wchar_t aCmd[BUFFSZ] = TEXT("/K dir"); // CMD /?
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    SECURITY_ATTRIBUTES sa;

    printf("Starting...\n");

    ZeroMemory(&si, sizeof(STARTUPINFO));
    ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));

    // Create one-way pipe for child process STDOUT
    if (!CreatePipe(&g_hChildStd_OUT_Rd, &g_hChildStd_OUT_Wr, &sa, 0)) {
        printf("CreatePipe() error: %ld\n", GetLastError());
    }

    // Ensure read handle to pipe for STDOUT is not inherited
    if (!SetHandleInformation(g_hChildStd_OUT_Rd, HANDLE_FLAG_INHERIT, 0)) {
        printf("SetHandleInformation() error: %ld\n", GetLastError());
    }

    // Create one-way pipe for child process STDIN
    if (!CreatePipe(&g_hChildStd_IN_Rd, &g_hChildStd_IN_Wr, &sa, 0)) {
        printf("CreatePipe() error: %ld\n", GetLastError());
    }

    // Ensure write handle to pipe for STDIN is not inherited
    if (!SetHandleInformation(g_hChildStd_IN_Rd, HANDLE_FLAG_INHERIT, 0)) {
        printf("SetHandleInformation() error: %ld\n", GetLastError());
    }

    si.cb = sizeof(STARTUPINFO);
    si.hStdError = g_hChildStd_OUT_Wr;
    si.hStdOutput = g_hChildStd_OUT_Wr;
    si.hStdInput = g_hChildStd_IN_Rd;
    si.dwFlags |= STARTF_USESTDHANDLES;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    // Pipe handles are inherited
    sa.bInheritHandle = true;

    // Creates a child process
    result = CreateProcess(
        TEXT("C:\\Windows\\System32\\cmd.exe"),     // Module
        aCmd,                                       // Command-line
        NULL,                                       // Process security attributes
        NULL,                                       // Primary thread security attributes
        true,                                       // Handles are inherited
        CREATE_NEW_CONSOLE,                         // Creation flags
        NULL,                                       // Environment (use parent)
        NULL,                                       // Current directory (use parent)
        &si,                                        // STARTUPINFO pointer
        &pi                                         // PROCESS_INFORMATION pointer
        );

    if (result) {
        printf("Child process has been created...\n");
    }
    else {
        printf("Child process could not be created\n");
    }

    bool bStatus;
    CHAR aBuf[BUFFSZ + 1];
    DWORD dwRead;
    DWORD dwWrite;
    // GetStdHandle(STD_OUTPUT_HANDLE)

    while (true) {
        bStatus = ReadFile(g_hChildStd_OUT_Rd, aBuf, sizeof(aBuf), &dwRead, NULL);
        if (!bStatus || dwRead == 0) {
            break;
        }
        aBuf[dwRead] = '\0';
        printf("%s\n", aBuf);
    }

        // Wait until child process exits
        WaitForSingleObject(pi.hProcess, INFINITE);

        // Close process and thread handles
        CloseHandle(pi.hProcess);
        CloseHandle(pi.hThread);

        printf("Stopping...\n");

        return 0;
    }