I have a Java class that returns a unicode string... Java has the correct version of the string but when it comes through a JNI wrapper in the form of a jstring it must be converted over to a C++ or C++/CLI string. Here is some test code I have which actually works on most languages except for the asian char sets. Chinese Simplified & Japanese characters are garbled and I can't figure out why. Here is the code snippet, I don't see anything wrong with either methods of conversion (the if statement checks os as I have two VMs with diff OS's and runs the appropriate conversion method).
String^ JStringToCliString(const jstring string){
String^ converted = gcnew String("");
JNIEnv* envLoc = GetJniEnvHandle();
std::wstring value;
jboolean isCopy;
if(string){
try{
jsize len = env->GetStringLength(string);
if(Environment::OSVersion->Version->Major >= 6) // 6 is post XP/2003
{
TraceLog::Log("Using GetStringChars() for string conversion");
const jchar* raw = envLoc->GetStringChars(string, &isCopy);
// todo add exception handling here for jvm
if (raw != NULL) {
value.assign(raw, raw + len);
converted = gcnew String(value.c_str());
env->ReleaseStringChars(string, raw);
}
}else{
TraceLog::Log("Using GetStringUTFChars() for string conversion.");
const char* raw = envLoc->GetStringUTFChars(string, &isCopy);
if(raw) {
int bufSize = MultiByteToWideChar(CP_UTF8, 0 , raw , -1, NULL , 0 );
wchar_t* wstr = new wchar_t[bufSize];
MultiByteToWideChar( CP_UTF8 , 0 , raw , -1, wstr , bufSize );
String^ val = gcnew String(wstr);
delete[] wstr;
converted = val; // partially working
envLoc->ReleaseStringUTFChars(string, raw);
}
}
}catch(Exception^ ex){
TraceLog::Log(ex->Message);
}
}
return converted;
}
Answer was to enable east asian languages in Windows XP as Win7 + Later work fine. Super easy.... waste of a entire day lol.