使用管道实现进程间的通信

#include <Windows.h>
#include <stdio.h>
void main()
{
SECURITY_ATTRIBUTES sa,sb;
HANDLE hInputRead,hInputWrite;
HANDLE hOutputRead,hOutputWrite;

sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
if(!CreatePipe(&hOutputRead,&hOutputWrite,&sa,0))
{
printf("Error On CreatePipe1");
return;
}

sb.nLength = sizeof(SECURITY_ATTRIBUTES);
sb.lpSecurityDescriptor = NULL;
sb.bInheritHandle = TRUE;
if(!CreatePipe(&hInputRead,&hInputWrite,&sb,0))
{
printf("Error On CreatePipe2");
return;
}

STARTUPINFO   si;
PROCESS_INFORMATION   pi;
si.cb = sizeof(STARTUPINFO);
GetStartupInfo(&si);
si.hStdError = hOutputWrite;
si.hStdOutput = hOutputWrite;
si.hStdInput = hInputRead;
si.wShowWindow = SW_HIDE;
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;

//注意程序a的位置
if(!CreateProcess(NULL,"E://a.exe",NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
{
printf("Error On CreateProcess");
return;
}

CloseHandle(hInputRead);
CloseHandle(hOutputWrite);

DWORD dwWritten;
char   szInPut[10] = "12/r/n21/r/n";
WriteFile(hInputWrite, szInPut, strlen(szInPut), &dwWritten, NULL);

char buffer[4096] = {0};
DWORD bytesRead;
while(true)
{
if(ReadFile(hOutputRead,buffer,4095,&bytesRead,NULL) == NULL)
{
break;
}

printf(buffer);
Sleep(500);
}

CloseHandle(hInputWrite);
CloseHandle(hOutputRead);
getchar();
}