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问题描述
我编写了一个Java程序,该程序可以编译并执行C,c ++,java程序。.我首先对其进行了Java测试,并且运行良好。然后我对它进行了C语言测试,但出现了错误。请告诉我我该怎么做..这是编译代码的模块..:
I have written a java program that compiles and executes C,c++,java programs ..I firstly tested it for java and it worked absolutely fine. Then I tested it for C but it gave errors.Please tell what I need to do..Here is the module which compiles the code..:
public void compileCode(String path,String lang)throws IOException
{
String cmd="";
if(lang.equals("c")||lang.equals("cpp"))
cmd="g++ Main"+threadNum+"."+lang+" -o "+threadNum;
else if(lang.equals("java"))
cmd="javac Main"+threadNum+".java";
Process p=Runtime.getRuntime().exec(cmd,null,new File(path));
String s=null;
BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
while ((s = stdError.readLine()) != null) {
msg+=s+"\n";
res=0;
}
if(res!=0)
processCode(path,lang);
}
错误为:
Exception in thread "main" java.io.IOException: Cannot run program "g++" (in directory "C:\wamp\www\usercodes\lokesh"): CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
at java.lang.Runtime.exec(Runtime.java:615)
at java.lang.Runtime.exec(Runtime.java:448)
at Contest.compileCode(Main.java:164)
at Contest.makeFile(Main.java:154)
at Contest.main(Main.java:52)
at Main.main(Main.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:1
20)
推荐答案
为使 g ++工作,Windows的PATH上必须有一个g ++。exe。如果它是 g ++。bat或 g ++。cmd,则必须使用确切名称调用Runtime.exec。
For "g++" to work, there has to be a g++.exe on the PATH for windows. If it is a "g++.bat" or "g++.cmd", you have to call Runtime.exec with the exact name.
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