CreateProcess 只执行一半命令

Question

I have a problem with CreateProcess. I have create the following Source Code:

STARTUPINFOA si;
PROCESS_INFORMATION pi;

ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));

CreateProcessA(nullptr,
    "plink.exe -telnet -P 9999  192.168.230.75 < C:\\Users\\Mahre\\Scripts\\Telenet_Script.txt",
    nullptr,//security
    nullptr,// security
    FALSE,//inherits handles
    0,
    nullptr,
    nullptr,
    &si,
    &pi);

WaitForSingleObject(pi.hProcess, INFINITE);

CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);

The problem is that CreateProcess executes the command only in half. The command plink.exe -telnet -P 9999 192.168.230.75 is executed, but CreateProcess ignore this part < C:\\Users\\Mahre\\Scripts\\Telenet_Script.txt . I'm pretty sure it's the less than sign.

With the evil system() it works very well and it was execute the complete command:

system("plink.exe -telnet -P 9999  192.168.230.75 < C:\\Users\\Mahre\\Scripts\\Telenet_Script.txt");

Can someone explain to me how I can do this with the CreateProcess?

Answer 1

The input redirection operator is provided by the shell, in this case cmd.exe .

To do this with CreateProcess() , you need to do this yourself.

First open the file you want to use as input for reading using CreateFile() and set the handle to be inheritable. When you call CreateProcess() , you need to set the inheritable handles flag to TRUE, and fill in the STARTUPINFO struct to contain the handle you want to use for standard input.

When doing it this way, you should not provide the "< filename" part of the command because you have set that up by hand.

For more information, read the CreateProcess documentation on MSDN. The are examples in the documentation covering variants on this case.