我编写了一个编译和执行C,c ++,java程序的java程序。我首先测试了它的java并且它工作得非常好。然后我测试它为C但它给出了错误。请告诉我需要做什么..这是编译代码的模块..:
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);
}
错误是:
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)
答案 0 :(得分:2)
要使“g ++”起作用,必须在PATH for windows上使用g ++。exe。如果它是“g ++。bat”或“g ++。cmd”,则必须使用确切的名称调用Runtime.exec。
答案 1 :(得分:0)
我使用了流程生成器,而且它已经解决了......谢谢你的时间:) 这是代码......
public void compileCode(String path,String lang)throws IOException,InterruptedException
{
String cmd="";
if(lang.equals("c")||lang.equals("cpp"))
cmd="g++ "+path+"Main"+threadNum+"."+lang+" -o "+threadNum;
else if(lang.equals("java"))
cmd="javac Main"+threadNum+".java";
ProcessBuilder process=new ProcessBuilder();
process.directory(new File(path));
process.command(new String[]{"cmd","/c",cmd});
Process p=process.start();
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);
}