用java的命令行参数调用C程序

Question

我想将我的java程序中的参数传递给作为命令行参数执行的C程序。这是我的C程序，

#include <stdio.h> 

int main(int argc, char *argv[]) { 

    if(argc == 2) { 
     printf("The argument supplied is %s\n", argv[1]); 
    } 
    else if(argc > 2) { 
     printf("Too many arguments supplied.\n"); 
    } 
    else { 
     printf("One argument expected.\n"); 
    } 
} 

这是我从终端编译它时得到的输出。

[email protected]:~/Desktop/jni$ ./a.out param1 
The argument supplied is param1 

我想从我的java程序传递参数（param1）到这个程序。我怎样才能做到这一点？我尝试使用java进程生成器，但它总是返回-1。

try { 
       ProcessBuilder processBuilder = 
         new ProcessBuilder("gcc", "/home/lclab/Desktop/jni/test.c", "param1"); 
       Process proc = processBuilder.start(); 
       System.out.println(proc.getInputStream().read()); 
       return proc.getInputStream().read(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
       return 99; 
      } 

我的机器是ubuntu。

Answer 1

编译C源代码，你会得到可执行文件。

g++ test.c -o test 

改变这一行

new ProcessBuilder("gcc", "/home/lclab/Desktop/jni/test.c", "param1"); 

粘贴，而不是test.c

new ProcessBuilder("gcc", "/home/lclab/Desktop/jni/test", "param1"); 

可执行文件名或者使用Java native interface

编辑：

public static void CompileCprog(String filename){ 

     File dir = new File("C://Users//JohnDoe//workspace//Project"); 

     try { 
      String exeName = filename.substring(0, filename.length() - 2); 
      Process p = Runtime.getRuntime().exec("cmd /C gcc " + filename + " -o " + exeName, null, dir); 
      Process p = Runtime.getRuntime().exec("cmd /C dir", null, dir); 
      BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); 
      String line = null; 
      while ((line = in.readLine()) != null) { 
       System.out.println(line); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    }