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This page contains an archived post to the Java Answers Forum made prior to February 25, 2002.
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Message:
compile problems using JNI and VC++
Posted by Jeff Caswell on August 21, 2001 at 10:48 AM
I am doing something very similar to what is right out of Rob Gordon's JNI book but I am getting compile errors. This should be a simple one for you guys. Please help.
Thanks... Here's the code:
#include
#include
#include
#include "jni.h"
#include "SAVI.H"
#include "SAVITAG.H"
#include "com_unisys_itv_JVendor.h"
jobjectArray JNICALL Java_com_unisys_itv_JVendor_sIntReport(JNIEnv *env,
jobject this,
jint nx,
jint report_format) {
// Tag Data collected
TagSet_t *tags;
int i = 0;
Savi_Code = Savi_Int_Report(nList[nx].id, &tags, report_format); if (Savi_Code == SAVI_OK) { // determine size of array to create
jint arySz = (jint) tags->n_tags;
// load the class of array elements with class loader
jclass clazz = env->FindClass("com/unisys/itv/JSaviFullRpt");
if (clazz == 0 ) {
return NULL;
}
// create the array of Java JSaviFullRpt objects
jobjectArray aryFullTagt = env->NewObjectArray(arySz, clazz, NULL);
if (aryFullTagt == 0) {
return NULL;
} // create the field IDs so we can access the Java object's fields
jfieldID fTagId_FID = env->GetFieldID(env, clazz, "tag_id", "I"); // create the Java constructor method ID so it can be called
jmethodID mid = env->GetMethodID(clazz, "", "()V");switch (report_format) { case FULL_REPORT:
for (i = 0; i < tags->n_tags; i++) {
// create the Java array element (call its no-args ctor)
jobject thisJSaviFullRpt = env->NewObject(clazz, mid);
env->SetObjectArrayElement(aryFullTagt, i, thisJSaviFullRpt); // set aryFullTagt.tag_id
env->SetIntField(env, thisJSaviFullRpt, fTagId_FID,
((jint) tags->tag.FULL.tag_id)); // delete the local reference created above
env->DeleteLocalRef(thisJSaviFullRpt);
}
break; } // return the array created
return aryFullTagt;
} // report was not generated properly
return NULL;
}
And here's the errors:
error C2223: left of '->FindClass' must point to struct/union
error C2275: 'jobjectArray' : illegal use of this type as an expression
\jni.h(99) : see declaration of 'jobjectArray'
error C2146: syntax error : missing ';' before identifier 'aryFullTagt'
error C2065: 'aryFullTagt' : undeclared identifier
error C2223: left of '->NewObjectArray' must point to struct/union
error C2275: 'jfieldID' : illegal use of this type as an expression
e:\itvclient\src_c\rwcommon\savi_dll\jni.h(118) : see declaration of 'jfieldID' error C2275: 'jmethodID' : illegal use of this type as an expression
\jni.h(121) : see declaration of 'jmethodID'
error C2146: syntax error : missing ';' before identifier 'mid'
error C2065: 'mid' : undeclared identifier
error C2223: left of '->GetMethodID' must point to struct/union error C2223: left of '->DeleteLocalRef' must point to struct/union
warning C4047: 'return' : 'struct _jobject *' differs in levels of indirection from 'int ' ... (more similar) Error executing cl.exe. It is like it is not finding or using the header files or using the wrong ones but I have checked to be sure the included jni.h and jni_md.h are up to date (from JBuilder5). I also made sure the class file used in FindClass is in the environment's classpath.
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