Java HotSpot Virtual Machine

How to convert jstring in jni to LPCTSTR and and jboolean to bool ,so that the jni function

JNIEXPORT void JNICALL Java_WMSMS_SendSMS(JNIEnv *env,jobject obj,jboolean bSendConfirmation, jboolean bUseDefaultSMSC, jstring smsc,jstring phno,jstring msg)

will map to the actual C++ function which has the following prototype

void SendSMS(BOOL bSendConfirmation, BOOL bUseDefaultSMSC, LPCTSTR lpszSMSC, LPCTSTR lpszRecipient, LPCTSTR lpszMessage) ?

The actual cpp code which I want to convert into a jni class is given below:

void SendSMS(BOOL bSendConfirmation, BOOL bUseDefaultSMSC, LPCTSTR lpszSMSC, LPCTSTR lpszRecipient, LPCTSTR lpszMessage)
{
	SMS_HANDLE smshHandle;
	SMS_ADDRESS smsaSource;
	SMS_ADDRESS smsaDestination;
	TEXT_PROVIDER_SPECIFIC_DATA  tpsd;
	SMS_MESSAGE_ID smsmidMessageID;

	// try to open an SMS Handle
	if(FAILED(SmsOpen(SMS_MSGTYPE_TEXT, SMS_MODE_SEND, &smshHandle, NULL)))
	{
		MessageBox(NULL,
					(LPCTSTR)LoadString(ghInstance, IDS_ERROR_SMSOPEN, 0, 0), 
					(LPCTSTR)LoadString(ghInstance, IDS_CAPTION_ERROR, 0, 0),
					MB_OK | MB_ICONERROR);
		return;
	}

	// Create the source address
	if(!bUseDefaultSMSC)
	{
		smsaSource.smsatAddressType = SMSAT_UNKNOWN;
		_tcsncpy(smsaSource.ptsAddress, lpszSMSC, SMS_MAX_ADDRESS_LENGTH);
	}

	// Create the destination address
	smsaDestination.smsatAddressType = SMSAT_UNKNOWN;
	_tcsncpy(smsaDestination.ptsAddress, lpszRecipient, SMS_MAX_ADDRESS_LENGTH);

	// Set up provider specific data
               memset(&tpsd, 0, sizeof(tpsd));
	tpsd.dwMessageOptions = bSendConfirmation ? PS_MESSAGE_OPTION_STATUSREPORT : PS_MESSAGE_OPTION_NONE;
	tpsd.psMessageClass = PS_MESSAGE_CLASS1;
	tpsd.psReplaceOption = PSRO_NONE;
	tpsd.dwHeaderDataSize = 0;

	// Send the message, indicating success or failure
	if(SUCCEEDED(SmsSendMessage(smshHandle, ((bUseDefaultSMSC) ? NULL : &smsaSource), 
								 &smsaDestination, NULL, (PBYTE) lpszMessage, 
								 _tcslen(lpszMessage) * sizeof(TCHAR), (PBYTE) &tpsd, 
								 sizeof(TEXT_PROVIDER_SPECIFIC_DATA), SMSDE_OPTIMAL, 
								 SMS_OPTION_DELIVERY_NONE, &smsmidMessageID)))
	{
		MessageBox(NULL,
					(LPCTSTR)LoadString(ghInstance, IDS_SMSSENT, 0, 0), 
					(LPCTSTR)LoadString(ghInstance, IDS_CAPTION_SUCCESS, 0, 0),
					MB_OK);
	}
	else
	{
		MessageBox(NULL,
					(LPCTSTR)LoadString(ghInstance, IDS_ERROR_SMSSEND, 0, 0), 
					(LPCTSTR)LoadString(ghInstance, IDS_CAPTION_ERROR, 0, 0),
					MB_OK | MB_ICONERROR);
	}

	// clean up
	VERIFY(SUCCEEDED(SmsClose(smshHandle)));
}

I used the typecasting to TCHAR as below:

const TCHAR * lpszRecipient =(TCHAR *) env->GetStringUTFChars(phno,0);
    const TCHAR * lpszMessage = (TCHAR *)env->GetStringUTFChars(msg,0);
    const TCHAR * lpszSMSC = (TCHAR *)env->GetStringUTFChars(smsc,0);

But then ReleaseStringUTFChars shows error. How to use ReleaseStringUTFChars() in this case?