在这里我创建了一个JAVA类,其中我有必须从C文件中调用的函数(回调函数)。如何创建静态JNI环境指针?
class DSMInitializeClassParameter {
/**
* Callback function for DSM Initialize.
*/
public void DSMInitializeCallback() {
// Write Message To Logs.
System.out.println("Dsm Initialize Callback called.");
}
}
为此,我创建了必须调用的本地方法。
public class DsmLibraryTest extends Activity {
// Some code ....
// Create a DSMInitializeClassParameter class object.
DSMInitializeClassParameter object = new DSMInitializeClassParameter();
// Call native method with given object.
nativeMethod(object);
// Some code ....
// Implementation of native method.
public native int nativeMethod(DSMInitializeClassParameter classObject);
}
在Ç文件我有以下几点:
dsmResult_t dsmInitializeCall(dsmResult_t status, void * pUserData, dsmEvent_t * hEvent) {
(*env)->CallVoidMethod(env, classObject, mid);
}
JNIEXPORT jint JNICALL Java_com_Dsm_Test_DsmLibraryTest_nativeMethod(JNIEnv* env, jobject obj, jobject classObject) {
// This function loads a locally-defined class. It searches the directories and zip
// files specified by the CLASSPATH environment variable for the class with the specified name.
jclass cls = (*env)->FindClass(env, "com/Dsm/Test/DSMInitializeClassParameter");
// Get java Method.
jmethodID mid = (*env)->GetMethodID(env, cls, "DSMInitializeCallback", "()V");
// If no method was found return -1;
if(mid == NULL) {
return -1;
}
// Call DSM Initialize Callback Function and return value.
return dsmInitialize(dsmInitializeCall, NULL);
}
你怎么看我想打电话给(*env)->CallVoidMethod(env, classObject, mid);
从dsmInitializeCall
功能,但我怎么能叫,如果我没有env
,classObject
和mid
我尝试使用静态但不起作用。
非常感谢,我会在明天检查我的工作场所......可能你可以帮助我解决这个问题吗? http://stackoverflow.com/questions/6152747/jni-not-support-types-as-void-unsigned-int-what-to-do – 2011-06-01 20:04:14
为什么我不能使用jclass cls =(* env) - > GetObjectClass( env,classObject);而不是jclass cls =(* env) - > FindClass(env,“com/Dsm/Test/DSMInitializeClassParameter”);我认为classObject是我的类的对象,我有DSMInitializeCallback,所以我可以从该对象获取类。但是,当我尝试应用程序崩溃与Dalvic虚拟机错误....但为什么? – 2011-06-02 05:35:50
http://stackoverflow.com/questions/6184678/where-can-i-see-message-from-jni-printf-in-eclipse – 2011-06-02 08:35:44