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YongSu-3473 asked XiaopoYang-MSFT edited

Using VC++ code to call ssh.exe to link linux machine, return 255

Hi, experts,
I need to call ssh.exe from VS c++ codes to call a linux machine. I tried following from the Visual Studio 2013 c++ codes:
MyString sExeName("ssh");
MyString sHost;

  errno_t err = _set_errno(0);
  intptr_t t = _wspawnlp(_P_WAIT, sExeName.c_str(), sExeName.c_str(), sHost.c_str(), NULL);


ssh.exe is in my path: "C:\Program Files\OpenSSH-Win64" But I now get t = 255, without error, meaning that it already started call the ssh.exe, but didn't return 0. What does 255 means?

If I open the dos command prompt, and call the following line, it works fine:
"ssh [hostxxxx]@yyy . ~/"

So what is wrong with my c++ codes?


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If the manual command has several arguments (separated by space), then you probably should pass the corresponding arguments to _wspawnlp too.

Also try a simpler function: system("ssh [hostxxxx]@yyy . ~/").

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II did pass all the arguments, with NULL in the end.

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Well, from what I can see it appears that the SHost variable was not initialized with any parameters.

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If you are using a DOS command prompt then you are using a very old version of Windows. Use a command prompt in a current version of Windows instead of using a DOS command prompt.

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