How to generate an DLL file in Eclipse?

[songxueyu]

I just re-installed my OS some days ago,which contained Visual Studio.But I don't want to use the VS any more(at least in my computer) as the interminable installing process.Then I take Eclipse as my C/C++ IDE by MinGW and CDT.
My Java program need to load an DLL file which wrote by C.But when I generating the DLL file,I got some errors.It seems that the compiler cannot find the header files.
By the way,I just want to implement the hello-world program in C and invoke it in the Java program.
This is my Java testing program:

public class HelloWorld{    public native void printHelloWorld();
    static{
        System.loadLibrary("hello"); 
    }
    public static void main(String[] args){
        new HelloWorld().printHelloWorld();
    }
}

And this is the header file generating by "javah HelloWorld":

/* DO NOT EDIT THIS FILE - it is machine generated */#include <jni.h>
/* Header for class HelloWorld */


#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     HelloWorld
 * Method:    printHelloWorld
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_HelloWorld_printHelloWorld
  (JNIEnv *, jobject);


#ifdef __cplusplus
}
#endif
#endif

And this is the C file:

#include "jni.h"#include "HelloWorld.h"


#include<stdio.h>


JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
{
    printf("Hello world!\n");
    return;

}

And this is the screenshot of error:

[songxueyu]

I have solved the problem but I'm not sure whether it's the standard way:I copy the "jni_md.h" file into my project because "jni.h" includes "jni_md.h" and then it compiled successfully.