[求助]问个有关管道的问题

//偶改了别人的程序 想试试 可是不行
#include <stdio.h>
#include <windows.h>
#include <conio.h>

int main(void)
{

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={0};
PROCESS_INFORMATION pi={0};
si.cb = sizeof(STARTUPINFO);
GetStartupInfo(&si);
si.hStdError = hWrite;
si.hStdOutput = hWrite;
si.wShowWindow = SW_HIDE;
si.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES;

char szPath[MAX_PATH]="miniqq";
strcat(szPath," ");//可以添个能登陆的号试一下

if (!CreateProcess(NULL,szPath,NULL,NULL,TRUE,DETACHED_PROCESS,NULL,NULL,&si,&pi))
{
printf("Error on CreateProcess()");
return 0;
}
CloseHandle(hWrite);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);

char buffer[4096] = {0};
DWORD bytesRead;
//Sleep(5000);
int i = 0;
while (i<6)
{
if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL) break;

printf("%s\r\n",buffer);
printf("%ld\r\n",bytesRead);
i++;
}
getch();
//CloseHandle(hRead);
return 0;
}