How can i convert jstring to PSTR with chinese character

Question

Hi all,
I'm not an expert of C++. So please help me to fix the following problem.
I'm using jni to call the dll. In java side, the input parameter is jstring. In C++ side, the input parameter of PrintDrugReceipt are PSTR.
The following is the code of my C++:
#include <windows.h>
#include <stdio.h>
#include <jni.h>
#include "DrugReceiptWrapper.h"
#include "DrugReceipt.h"
const char * JNU_GetStringNativeChars(JNIEnv *env, jobject obj, jstring jstr) {
jbyteArray bytes = 0;
jthrowable exc;
     jclass cls;
     jmethodID getBytes;
char *result = 0;
if ((*env)->EnsureLocalCapacity(env, 2) < 0) {
return 0; /* out of memory error */
     cls = (*env)->GetObjectClass(env, obj);
     getBytes = (*env)->GetMethodID(env, cls, "getBytes","()[B");
     //jbyteArray buf = (jbyteArray*)(*env)->CallObjectMethod(env, obj, jlprSourceChiName, getBytes);
     bytes = (*env)->CallObjectMethod(env, jstr, getBytes);
     exc = (*env)->ExceptionOccurred(env);
     if (!exc) {
         jint len = (*env)->GetArrayLength(env, bytes);
         result = (char *)malloc(len + 1);
         if (result == 0) {
             //JNU_ThrowByName(env, "java/lang/OutOfMemoryError", 0);
             (*env)->DeleteLocalRef(env, bytes);
             return 0;
(*env)->GetByteArrayRegion(env, bytes, 0, len, (jbyte *)result);
result[len] = 0; /* NULL-terminate */
} else {
(*env)->DeleteLocalRef(env, exc);
(*env)->DeleteLocalRef(env, bytes);
return result;
JNIEXPORT jlong JNICALL
Java_TestPrint_PrintDrugReceiptWrapper(
JNIEnv *env, jobject obj,
jstring jlprPrinterPort, jstring jlprSourceChiName,
jstring jlprTargetChiName, jstring jlprPrintData1,
jstring jlprPrintData2, jstring jlprCaseNo, jstring jlprReceiptNo){
     PSTR lprPrinterPort;
     PSTR lprSourceChiName;
     PSTR lprTargetChiName, lprPrintData1;
PSTR lprPrintData2 , lprCaseNo, lprReceiptNo;
     printf("before %s", jlprSourceChiName);
     lprPrinterPort = (*env)->GetStringChars(env, jlprPrinterPort , 0);
     lprSourceChiName = (*env)->GetStringChars(env, jlprSourceChiName, 0);     
     lprTargetChiName = (*env)->GetStringChars(env, jlprTargetChiName, 0);
     lprPrintData1 = (*env)->GetStringChars(env, jlprPrintData1 , 0);
     lprPrintData2 = (*env)->GetStringChars(env, jlprPrintData2 , 0);
lprCaseNo = (*env)->GetStringChars(env, jlprCaseNo , 0);
     lprReceiptNo = (*env)->GetStringChars(env, jlprReceiptNo , 0);
     PrintDrugReceipt(lprPrinterPort, lprSourceChiName, lprTargetChiName, lprPrintData1, lprPrintData2, lprCaseNo, lprReceiptNo);
     (*env)->ReleaseStringChars(env, jlprPrinterPort , lprPrinterPort);
     (*env)->ReleaseStringChars(env, jlprSourceChiName, lprSourceChiName);
     (*env)->ReleaseStringChars(env, jlprTargetChiName, lprTargetChiName);
     (*env)->ReleaseStringChars(env, jlprPrintData1 , lprPrintData1);
     (*env)->ReleaseStringChars(env, jlprPrintData2 , lprPrintData2);
     (*env)->ReleaseStringChars(env, jlprCaseNo , lprCaseNo);
     (*env)->ReleaseStringChars(env, jlprReceiptNo , lprReceiptNo);
     return 1;
the h file:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class TestPrint */
#ifndef _Included_TestPrint
#define _Included_TestPrint
#ifdef __cplusplus
extern "C" {
#endif
* Class: TestPrint
* Method: PrintDrugReceipt
* Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)J
JNIEXPORT jlong JNICALL Java_TestPrint_PrintDrugReceiptWrapper
(JNIEnv *, jobject, jstring, jstring, jstring, jstring, jstring, jstring, jstring);
#ifdef __cplusplus
#endif
#endif
Note: the jstring input parameters are the chinese character. If i print out the jstring, it will display dirty character, why? and how to fix it? and the PrintDrugReceipt will expected accept the chinese character and print it to the printer.
Thank you for you guys help.
Matthew

Answer 1

you can't use char...have to use a wchar....and look around at the wide character handling function in C/C++.