I am trying to do the following
std::stringstream str;
string string1, string2;
long a = 23343;
long b = 323234;
str << std::hex << a;
str >> string1; //line no. 6
str << std::hex << b;
str >> string2; //line no.8
a & b are values contained inside a structure and this structure is being sent as an event to other process, which extracts these values. The problem I encounter is when I do
str.flush()
after line no.6, the string string1 is empty and an empty string is passed to other process.
Is there any way to reuse the stringstream str for different values?
Here is the actual code --
void* CIAppDiagService::SendDidValue(void *arg)
{
DiagService::SReadDIDResponse didResponse;
didResponse.ComponentId = ::DiagService::eComponentMin; //Todo
didResponse.bStatus=false;
didResponse.nDIDCode=((CIAppDiagService*)arg)->mDIDCode;
if(didResponse.nDIDCode == 0xD95C)
{
::CIApplicationManager::UUIDList_var aUidList;
//get uuid list
AppMgrServerData::getAppMgrServerData()->AppDirectory().getList(aUidList.out()); //fills the UUIDList which is a sequence of string
if(aUidList->length() > 0)
{
std::string aAppDetails,aAppVersion,aAppVersionString,aAppIDString,NumberOfAppsInstalledString;
AppId aAppId; //typedef long AppId
CORBA::ULong ulength = aUidList->length();
std::stringstream stream,stream1,stream2;
short int iAppVersion;
aAppDetails.append("000000ff");
short int iNumberOfAppsInstalled = AppMgrServerData::getAppMgrServerData()->AppDirectory().getTotalAppsInstalled(); // returns and integer
stream << std::hex << iNumberOfAppsInstalled;
stream >> NumberOfAppsInstalledString;
stream.clear();
if(1 == NumberOfAppsInstalledString.length() )
{
NumberOfAppsInstalledString = "000" + NumberOfAppsInstalledString;
}
else if(2 == NumberOfAppsInstalledString.length() )
{
NumberOfAppsInstalledString = "00" + NumberOfAppsInstalledString;
}
else if(3 == NumberOfAppsInstalledString.length() )
{
NumberOfAppsInstalledString = "0" + NumberOfAppsInstalledString;
}
strcat(const_cast<char*>(aAppDetails.c_str()),NumberOfAppsInstalledString.c_str());
for(int count = 0; count< aUidList->length(); count++)
{
aAppId = AppMgrServerData::getAppMgrServerData()->AppDirectory().getApplicationAppIDByUid((aUidList[count]));
aAppVersion = AppMgrServerData::getAppMgrServerData()->AppDirectory().getAppVersion(string(aUidList[count]));
stream1 << std::hex << aAppId % (std::numeric_limits<uint16_t>::max()+1);
stream1 >> aAppIDString; //convert aAppID into string
stream1.clear();
strcat(const_cast<char*>(aAppDetails.c_str()),aAppIDString.c_str());
TRACE(cout<<"check 1"<<endl);
iAppVersion = atoi(aAppVersion.c_str());
stream2 << std::hex << aAppVersion;
TRACE(cout<<"CIAppDiagService::: SendDidValue::: aAppVersion stream = "<< stream2 << endl);
stream2.seekg(0, std::ios::beg);
stream2 >> aAppVersionString;
stream2.clear();
//The following is some restriction/implementation that i need to follow.
if(1 == aAppVersionString.length() )
{
aAppVersionString = "000" + aAppVersionString;
}
else if(2 == aAppVersionString.length() )
{
aAppVersionString = "00" + aAppVersionString;
}
else if(3 == aAppVersionString.length() )
{
aAppVersionString = "0" + aAppVersionString;
}
strcat(const_cast<char*>(aAppDetails.c_str()),aAppVersionString.c_str()); //aAppVersion concatenated
}
int length = strlen(aAppDetails.c_str()) + 1;
if(length)
{
didResponse.DIDValue.length(length);
for(int i=0; i < length; i++)
{
didResponse.DIDValue[i]=aAppDetails[i];
cout<<" CIAppDiagService::SendDidValue:: didResponse.DIDValue[i]"<<didResponse.DIDValue[i]<<endl;
}
// didResponse.DIDValue[length] = '\0';
didResponse.bStatus = true;
}
else
{
char errResult[]={0x7F,0x22,0x22}; //error codes from media team/to be changed
didResponse.DIDValue.length(3);
didResponse.bStatus=false;
for(int i=0; i<3; i++)
{
didResponse.DIDValue[i]=errResult[i];
}
}
((CIAppDiagService*)arg)->SendEvent_ResponseDidValue(didResponse);
}
else
{
cout<<" No applications installed/No AppIDs found. "<<endl;
}
}
return 0;
}
void CIAppDiagService::SendEvent_ResponseDidValue(DiagService::SReadDIDResponse didResponse)
{
TRACE(cout<<"CIAppDiagService::entered in Send_Event Response"<<endl);
CosNotification::StructuredEvent event;
event.header.fixed_header.event_type.domain_name = CORBA::string_dup(DiagService::gDiagnosisServiceDomain);
event.header.fixed_header.event_name = CORBA::string_dup(DiagService::gReadDIDEventName);
event.header.variable_header.length(0); // put nothing here
event.filterable_data.length(0);
DiagService::SReadDIDResponse *tmp = new DiagService::SReadDIDResponse;
if (tmp != NULL) {
tmp->ComponentId = didResponse.ComponentId; //TODO
tmp->DIDValue = didResponse.DIDValue;
tmp->bStatus = didResponse.bStatus;
tmp->nDIDCode = didResponse.nDIDCode;
event.remainder_of_body <<= *tmp;
TRACE(cout<<"CIAppDiagService::SendEvent_ResponseDidValue:: calling send event"<< endl);
mCIDiagSupplier->send_event(event);
}
TRACE(cout<<"CIAppDiagService::exited from Send_Event Response"<<endl);
}
The idea is to concatenate all strings into a string appDetails and fill the structure member SReadDIDResponse.DIDValue And here is the structure SReadDIDResponse
struct SReadDIDResponse {
EComponent ComponentId; //enum values
TID nDIDCode; // integer
OctetSeq DIDValue; //octet sequence
boolean bStatus;
};
Use str.clear() to reset the string stream after line 6.