How to pipe InputStream to ProcessBuilder

Question

Please move down to the 2nd update. I didn\'t want to change the previous context of this question.

I\'m using wkhtmltoimage from a Java app.

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Answer 1

The following code works as well:

import java.io.*;
import java.util.*;

public class ProcessTest {

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb = new ProcessBuilder("/home/me/stdinecho");
        pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
        Process proc = pb.start();

        // Input file
        DataInputStream din = new DataInputStream((new FileInputStream("/home/me/stdinecho.cp")));
        byte[] dinBytes = new byte[din.available()];
        din.readFully(dinBytes);
        din.close();
        String content = new String(dinBytes, 0, dinBytes.length);
        content = "header\n" + content + "\nfooter";

        BufferedInputStream procStdout = new BufferedInputStream(proc.getInputStream());
        OutputStream stdin = proc.getOutputStream();

        stdin.write(content.getBytes());
        stdin.flush();
    }

}

Here stdinecho.cpp is the program that outputs the line entered on its prompt:

#include 
#include 
#include 

using namespace std;

int main()
{
    string strOutput;
    string str;
    while(getline(cin, str)) {
        cout << str << endl;
    }
}