java 异常 JNI (Ljava/lang/String;)Ljava/lang/String;
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Exception JNI (Ljava/lang/String;)Ljava/lang/String;
提问by JN_newbie
I have made a little program in java that accepts a string as a user input. Now i have made a dll writing its code in Visual C++. when i run my program from netbeans it displays this exception.
我用java做了一个小程序，它接受一个字符串作为用户输入。现在我已经制作了一个用 Visual C++ 编写代码的 dll。当我从 netbeans 运行我的程序时，它显示此异常。
Exception in thread "main" java.lang.UnsatisfiedLinkError: Prompt.getLine(Ljava/lang/String;)Ljava/lang/String;
at Prompt.getLine(Native Method)
at Prompt.main(Prompt.java:19)
What problem is this. Need Help. Thanks
这是什么问题。需要帮忙。谢谢
This is java code
这是java代码
public class Prompt {
/**
* @param args the command line arguments
*/
private native String getLine(String prompt);
public static void main(String[] args) {
// TODO code application logic here
Prompt p = new Prompt();
String input = p.getLine("Type a line:");
System.out.println("User Typed:" + input);
}
static {
System.loadLibrary("Prompt");
//System.load("C:/Program Files/Java/jdk1.6.0/bin/Prompt.dll");
}
}
and this is C++ Code
这是 C++ 代码
#include "stdafx.h"
#include "jni.h"
#include "jni_md.h"
JNIEXPORT jstring JNICALL Java_Prompt_getLine(JNIEnv *env, jobject obj, jstring prompt)
{
char buf[128];
const char *str;
str = env->GetStringUTFChars(prompt,0);
if (str == NULL) {
return NULL; /* OutOfMemoryError already thrown */
}
printf("%s", str);
env->ReleaseStringUTFChars(prompt, str);
/* We assume here that the user does not type more than
* 127 characters */
scanf("%s", buf);
return env->NewStringUTF(buf);
}
采纳答案by JN_newbie
@org.life.java....i got the problem and it was my mistake, i was not including the header file of java which is JNI style header file which is Prompt.hin c++, "#include "jni_md.h" this will be eliminated and included "Prompt.h"now it is working fine.
@org.life.java ....我遇到了问题，这是我的错误，我没有包含java的头文件，它是Prompt.hC++中的JNI样式头文件，“ #include "jni_md.h”这将被消除并"Prompt.h"现在包含它工作正常。
