如何在控制台程序中执行外部命令，并把结果回显到控制台

Question

比如我的控制台程序调用dir.exe，并把结果在当前窗口进行显示呢?

Answer 1

使用管道即可
http://www.cnblogs.com/ahuo/archive/2007/09/03/879961.html

Answer 2

使用管道
http://www.cnblogs.com/ahuo/archive/2007/09/03/879961.html

Answer 3

#include <stdio.h>
#include "windows.h"
DWORD DoMyCmd(char *cmdline,char *msg);
int main()
{ 
char buff[MAX_PATH];
char msg[4096];
DWORD nLen;
while(true)
{
memset(buff,0,MAX_PATH);
gets(buff);
nLen = DoMyCmd(buff,msg);
*(msg+nLen) = '\0';
printf(msg);
}

return 0; 
} DWORD DoMyCmd(char *cmdline,char *msg)
{
SECURITY_ATTRIBUTES sa;
    HANDLE hRead,hWrite;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (!CreatePipe(&hRead,&hWrite,&sa,0))
    {
printf("Error On CreatePipe()");
return 0;
    }
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdError = hWrite;
    si.hStdOutput = hWrite;
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;

char stmp[MAX_PATH] = {0};
GetSystemDirectory(stmp,MAX_PATH);
strcat(stmp,"\\cmd.exe /c ");
strcat(stmp,cmdline);
    if (!CreateProcess(NULL,stmp,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
    {
        printf("Error on CreateProcess()");
        return 0;
    }
    CloseHandle(hWrite) ;
    DWORD bytesRead;
DWORD nLen = 0;
    while (true)
    {
char buffer[100] = {0};
        if (ReadFile(hRead,buffer,100,&bytesRead,NULL) == NULL)
{
memcpy(msg+nLen,buffer,bytesRead);
nLen+=bytesRead;
CloseHandle(hRead);
            break;
}
memcpy(msg+nLen,buffer,bytesRead);
nLen+=bytesRead;
if(nLen>(4096-101) ) 
{
CloseHandle(hRead);
break;
}
    }
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return nLen;
}