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Download Java Native Interface: Programmer's Guide and Specification by Sheng Liang PDF

By Sheng Liang

The Java local Interface (JNI) allows the mixing of code written within the Java programming language with code written in different languages resembling C and C++. It permits programmers to take complete benefit of the Java platform with no need to desert their funding in legacy code. This e-book is the definitive source and a accomplished consultant to operating with the JNI. totally updated, the ebook bargains an educational, an in depth description of JNI positive factors and programming options, JNI layout justifications, and the respectable specification for all JNI varieties and services.

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Extra info for Java Native Interface: Programmer's Guide and Specification

Sample text

The garbage collection request will be blocked until the current thread executes ReleaseStringCritical, which cannot happen until the fprintf call returns. The fprintf call is waiting, however, for thread T to finish reading from the file handle. The following code, although similar to the example above, is almost certainly deadlock free: /* This code segment is OK. */ const char *c_str = (*env)->GetStringCritical(env, j_str, 0); if (c_str == NULL) { ... 3 DrawString is a system call that directly writes the string onto the screen.

For example, if the method you called back returned a value of type int, then your native method would use CallIntMethod. String instances and arrays. You can use CallMethod family of functions to invoke interface methods as well. You must derive the method ID from the interface type. Thread instance */ jmethodID mid; jclass runnableIntf = (*env)->FindClass(env, "java/lang/Runnable"); if (runnableIntf == NULL) { ... /* error handling */ } mid = (*env)->GetMethodID(env, runnableIntf, "run", "()V"); if (mid == NULL) { ...

You can then invoke the constructor by passing the method ID to JNI functions such as NewObject.

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