英文:
Why does my ProcessBuilder inputStream result in different data than from linux command line
问题
以下是您要翻译的部分：
当我从我的Ubuntu 18.4命令行运行以下命令时：
sudo ./nuvgpio 47 1 > gpioresult-47.txt
生成的文件包含以下数据：
尝试 4E
ChipID_Hi=0xD2，ChipID_Lo=0x82。
2，GP48，数据=0x00
当我从Java运行该过程时，结果流中不包含最后一行。
import java.io.*;
/**
* 运行命令行程序（nuvgpio）以读取/写入Jetway SBC上的GPIO引脚的状态。
*/
public class JetwayIODriver {
private static int LED_PIN_NUMBER = 40;
private static int COVER_PIN_NUMBER = 42;
public static void main(String args[]) throws InterruptedException {
try {
String directoryStr = "/home/tester2/IdeaProjects/automation-framework/device-common-parent/device-io/src/";
File dir = new File(directoryStr);
ProcessBuilder builder = new ProcessBuilder();
builder.directory(dir);
builder.redirectErrorStream();
int mode = 1; // 1=read, 0=write
builder.command("/bin/bash", "-c", "echo 'tester2' | sudo -S ./nuvgpio", Integer.toString(COVER_PIN_NUMBER), Integer.toString(mode));
Process process = builder.start();
InputStreamReader input = new InputStreamReader(process.getInputStream());
BufferedReader reader = new BufferedReader(input);
String line;
while ((line = reader.readLine()) != null) {
System.out.println ("Stdout: " + line);
}
int exitCode = process.waitFor();
input.close();
System.out.println(String.format("GPIO进程已完成，退出代码：%s", exitCode));
} catch (FileNotFoundException fnf) {
System.out.println(fnf.getMessage());
} catch (Throwable t) {
System.out.println(t.getMessage());
}
}
}
Java输出：
Stdout: 尝试 4E
Stdout: ChipID_Hi=0xD2，ChipID_Lo=0x82。
GPIO进程已完成，退出代码：0
值得注意的一件奇怪的事情是：当我从命令行运行并输出到控制台时，第3行文本位于新提示的同一行上：
nuvgpio程序似乎没有在末尾插入换行符。这可能是原因吗？如果是的话，我可以将其注入到进程输出中吗？
希望这对您有所帮助。
英文:
When I run the following command from my Ubuntu 18.4 command line:
sudo ./nuvgpio 47 1 > gpioresult-47.txt
The resulting file has the following data:
Try 4E
ChipID_Hi=0xD2, ChipID_Lo=0x82.
2, GP48, data=0x00
When I run the process from Java, the result stream does not contain the last line.
import java.io.*;
/**
* Run a command line program (nuvgpio) to read/write the status of GPIO pins on a Jetway SBC.
*/
public class JetwayIODriver {
private static int LED_PIN_NUMBER = 40;
private static int COVER_PIN_NUMBER = 42;
public static void main(String args[]) throws InterruptedException {
try {
String directoryStr = "/home/tester2/IdeaProjects/automation-framework/device-common-parent/device-io/src/";
File dir = new File(directoryStr);
ProcessBuilder builder = new ProcessBuilder();
builder.directory(dir);
builder.redirectErrorStream();
int mode = 1; // 1=read, 0=write
builder.command("/bin/bash", "-c", "echo 'tester2' | sudo -S ./nuvgpio", Integer.toString(COVER_PIN_NUMBER), Integer.toString(mode));
Process process = builder.start();
InputStreamReader input = new InputStreamReader(process.getInputStream());
BufferedReader reader = new BufferedReader(input);
String line;
while ((line = reader.readLine()) != null) {
System.out.println ("Stdout: " + line);
}
int exitCode = process.waitFor();
input.close();
System.out.println(String.format("GPIO process finished with exit code : %s", exitCode));
} catch (FileNotFoundException fnf) {
System.out.println(fnf.getMessage());
} catch (Throwable t) {
System.out.println(t.getMessage());
}
}
}
Output from Java:
Stdout: Try 4E
Stdout: ChipID_Hi=0xD2, ChipID_Lo=0x82.
GPIO process finished with exit code : 0
One odd thing of note: When I run from the command line and output to the console, the 3rd line of text is on the same line as the new prompt:
The nuvgpio program seems to be not putting a line break at the end. Could this be the cause and if so, can I inject one into the process output?
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