windows 下 C 与 C++ 执行 cmd 命令并实时获取输出

#include <stdio.h>#include <string.h>
int run_cmd(const char * cmd){  char MsgBuff[1024];  int MsgLen=1020;  FILE * fp;  if (cmd == NULL)  {    return -1;  }  if ((fp = _popen(cmd, "r")) == NULL)  {    return -2;  }  else  {    memset(MsgBuff, 0, MsgLen);
    //读取命令执行过程中的输出    while (fgets(MsgBuff, MsgLen, fp) != NULL)    {      printf("MsgBuff: %s\n", MsgBuff);    }
    //关闭执行的进程    if(_pclose(fp) == -1)    {      return -3;    }  }  return 0;}
int main(){  //const char *cmd = "ffmpeg -i D:\\123.mp4 -vf reverse D:\\out\\out1.mp4";    const char *cmd = "ping www.baidu.com";  int ret = 0;  ret = run_cmd(cmd);  printf("命令执行结果:%d\r\n",ret);
  getchar();  return 0;}

int my_CreateProcess(){  SECURITY_ATTRIBUTES sa;  sa.nLength = sizeof(sa);  sa.lpSecurityDescriptor = NULL;  sa.bInheritHandle = TRUE;
  _unlink("D:/out/output.log");
  HANDLE h = CreateFile((L"D:/out/output.log"),    FILE_APPEND_DATA,    FILE_SHARE_WRITE | FILE_SHARE_READ,    &sa,    OPEN_ALWAYS,    FILE_ATTRIBUTE_NORMAL,    NULL);
  PROCESS_INFORMATION pi;  STARTUPINFO si;  BOOL ret = FALSE;  DWORD flags = CREATE_NO_WINDOW;
  ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));  ZeroMemory(&si, sizeof(STARTUPINFO));  si.cb = sizeof(STARTUPINFO);  si.dwFlags |= STARTF_USESTDHANDLES;  si.hStdInput = NULL;  si.hStdError = h;  si.hStdOutput = h;
  TCHAR cmd[] = TEXT("ping www.baidu.com");  ret = CreateProcess(NULL, cmd, NULL, NULL, TRUE, flags, NULL, NULL, &si, &pi);
  if (ret)  {    WaitForSingleObject(pi.hProcess, INFINITE);    printf("执行成功....\n");    CloseHandle(pi.hProcess);    CloseHandle(pi.hThread);    //关闭文件    CloseHandle(h);    return 0;  }  //关闭文件  CloseHandle(h);  printf("执行失败....\n");  return -1;}

int my_CreateProcess(){  BOOL run_pipe;
  PROCESS_INFORMATION pi;  STARTUPINFO si;  BOOL ret = FALSE;  DWORD flags = CREATE_NO_WINDOW;
  _unlink("D:/out/output.log");
  char pBuffer[210];  SECURITY_ATTRIBUTES sa;  sa.nLength = sizeof(SECURITY_ATTRIBUTES);  sa.lpSecurityDescriptor = NULL;  sa.bInheritHandle = TRUE;  HANDLE hReadPipe, hWritePipe;  run_pipe=CreatePipe(&hReadPipe, &hWritePipe, &sa, 0);  printf("run_pipe=%d\n", run_pipe);
  ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));  ZeroMemory(&si, sizeof(STARTUPINFO));  si.cb = sizeof(STARTUPINFO);  si.dwFlags |= STARTF_USESTDHANDLES;   si.hStdInput = NULL;  si.hStdError = hWritePipe;  si.hStdOutput = hWritePipe;
  TCHAR cmd[] = TEXT("ffmpeg -i D:\\123.mp4 -vf reverse D:\\out\\out1.mp4");
  ret = CreateProcess(NULL, cmd, NULL, NULL, TRUE, flags, NULL, NULL, &si, &pi);
  if (ret)  {    while (true)    {      DWORD ExitCode = 0;      //判断进程是否执行结束      GetExitCodeProcess(pi.hProcess, &ExitCode);      if (ExitCode == STILL_ACTIVE) //正在运行      {        DWORD RSize=0;        BOOL run_s=0;        run_s =ReadFile(hReadPipe, pBuffer,200,&RSize,NULL);        pBuffer[RSize] = '\0';        printf("返回结果:%d,%d,%s\n", run_s, RSize, pBuffer);      }      else //结束      {        printf("执行完毕...\n");        break;      }    }        //WaitForSingleObject(pi.hProcess, INFINITE);    printf("执行成功....\n");    CloseHandle(pi.hProcess);    CloseHandle(pi.hThread);    return 0;  }  printf("执行失败....\n");  return -1;}