Native C++ metod, problem with attributes declared in other meth of Class

Question

Hi guys, I have an interesting question for you.
I have a big C++ program, with many classes and methods..., and a java program which uses one of the methods(for the moment!) of a class.I compiled the java program, created a .h file, changed a little bit the C++ program with JNI functions...ok i stop talking, this is my C++ piece of program:
JNIEXPORT jobject JNICALL
Java_ProjectionType_setProjectionType(JNIEnv *env, jobject obj, jstring
projectionType,jstring mapState){
const char *str =(env)->GetStringUTFChars(mapState,0);
if (mapState == NoMap) {
reportError ("setProjectionType failed, no active map image");
return false;
if (mapState == MapDrawing) {
reportError ("setProjectionType failed, drawing already started");
return false;
env->ReleaseStringUTFChars(mapState,str);
// Check the projection type
const char *sti =env->GetStringUTFChars(projectionType,0);
if (projectionType < Orthographic ||
projectionType > PolarSouth) {
reportError ("setProjectionType failed, invalid projection type");
return false;
mapProjectionType = projectionType;
switch (mapProjectionType) {
case Orthographic:
viewportLeft = -180.0;
viewportRight = 180.0;
viewportTop = 90.0;
viewportBottom = -90.0;
break;
case PolarNorth:
viewportLeft = -90.0;
viewportRight = 90.0;
viewportTop = -90.0;
viewportBottom = 90.0;
break;
case PolarSouth:
viewportLeft = -90.0;
viewportRight = 90.0;
viewportTop = 90.0;
viewportBottom = -90.0;
break;
return true;
env->ReleaseStringUTFChars(projectionType,sti);
I think this is quite correct~. But here is my problem: all the attributes that I declared in other methods, such as NoMap, MapDrawing..., seem to be undeclared.
(The C++ program itself worked fine!)
Here is an example of the error messages I encountered:
`NoMap' undeclared (first use this function)
What do I have to do to make it declared?
Any answer willbe welcome
Philippe

Answer 1

You haven't given enough information for someone to see what is going wrong. However I suspect you may have a couple of problems.
1. You should realize that what you have written is a subroutine, not a method. It is not part of any object declaration.
2. You refer to "attributes I declared in other methods...". This sounds mixed up to me. What other methods of what?
3. Watch out. When you get to actually trying to run this from java, you will probably get linkage erros. I assume the code you posted is in a cpp file. You need to declare that you want C linkage; otherwise the compiler generates code that java can't understand.