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POString stream related problems
 

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  1. POString stream related problems
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    <p>I am trying to do the following</p> <pre><code>std::stringstream str; string string1, string2; long a = 23343; long b = 323234; str &lt;&lt; std::hex &lt;&lt; a; str &gt;&gt; string1; //line no. 6 str &lt;&lt; std::hex &lt;&lt; b; str &gt;&gt; string2; //line no.8 </code></pre> <p>a &amp; 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</p> <pre><code>str.flush() </code></pre> <p>after line no.6, the <code>string string1</code> is empty and an empty <code>string</code> is passed to other process.</p> <p>Is there any way to reuse the <code>stringstream str</code> for different values?</p> <p>Here is the actual code -- </p> <pre><code>void* CIAppDiagService::SendDidValue(void *arg) { DiagService::SReadDIDResponse didResponse; didResponse.ComponentId = ::DiagService::eComponentMin; //Todo didResponse.bStatus=false; didResponse.nDIDCode=((CIAppDiagService*)arg)-&gt;mDIDCode; if(didResponse.nDIDCode == 0xD95C) { ::CIApplicationManager::UUIDList_var aUidList; //get uuid list AppMgrServerData::getAppMgrServerData()-&gt;AppDirectory().getList(aUidList.out()); //fills the UUIDList which is a sequence of string if(aUidList-&gt;length() &gt; 0) { std::string aAppDetails,aAppVersion,aAppVersionString,aAppIDString,NumberOfAppsInstalledString; AppId aAppId; //typedef long AppId CORBA::ULong ulength = aUidList-&gt;length(); std::stringstream stream,stream1,stream2; short int iAppVersion; aAppDetails.append("000000ff"); short int iNumberOfAppsInstalled = AppMgrServerData::getAppMgrServerData()-&gt;AppDirectory().getTotalAppsInstalled(); // returns and integer stream &lt;&lt; std::hex &lt;&lt; iNumberOfAppsInstalled; stream &gt;&gt; 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&lt;char*&gt;(aAppDetails.c_str()),NumberOfAppsInstalledString.c_str()); for(int count = 0; count&lt; aUidList-&gt;length(); count++) { aAppId = AppMgrServerData::getAppMgrServerData()-&gt;AppDirectory().getApplicationAppIDByUid((aUidList[count])); aAppVersion = AppMgrServerData::getAppMgrServerData()-&gt;AppDirectory().getAppVersion(string(aUidList[count])); stream1 &lt;&lt; std::hex &lt;&lt; aAppId % (std::numeric_limits&lt;uint16_t&gt;::max()+1); stream1 &gt;&gt; aAppIDString; //convert aAppID into string stream1.clear(); strcat(const_cast&lt;char*&gt;(aAppDetails.c_str()),aAppIDString.c_str()); TRACE(cout&lt;&lt;"check 1"&lt;&lt;endl); iAppVersion = atoi(aAppVersion.c_str()); stream2 &lt;&lt; std::hex &lt;&lt; aAppVersion; TRACE(cout&lt;&lt;"CIAppDiagService::: SendDidValue::: aAppVersion stream = "&lt;&lt; stream2 &lt;&lt; endl); stream2.seekg(0, std::ios::beg); stream2 &gt;&gt; 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&lt;char*&gt;(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 &lt; length; i++) { didResponse.DIDValue[i]=aAppDetails[i]; cout&lt;&lt;" CIAppDiagService::SendDidValue:: didResponse.DIDValue[i]"&lt;&lt;didResponse.DIDValue[i]&lt;&lt;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&lt;3; i++) { didResponse.DIDValue[i]=errResult[i]; } } ((CIAppDiagService*)arg)-&gt;SendEvent_ResponseDidValue(didResponse); } else { cout&lt;&lt;" No applications installed/No AppIDs found. "&lt;&lt;endl; } } return 0; </code></pre> <p>}</p> <pre><code>void CIAppDiagService::SendEvent_ResponseDidValue(DiagService::SReadDIDResponse didResponse) { TRACE(cout&lt;&lt;"CIAppDiagService::entered in Send_Event Response"&lt;&lt;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-&gt;ComponentId = didResponse.ComponentId; //TODO tmp-&gt;DIDValue = didResponse.DIDValue; tmp-&gt;bStatus = didResponse.bStatus; tmp-&gt;nDIDCode = didResponse.nDIDCode; event.remainder_of_body &lt;&lt;= *tmp; TRACE(cout&lt;&lt;"CIAppDiagService::SendEvent_ResponseDidValue:: calling send event"&lt;&lt; endl); mCIDiagSupplier-&gt;send_event(event); } TRACE(cout&lt;&lt;"CIAppDiagService::exited from Send_Event Response"&lt;&lt;endl); </code></pre> <p>}</p> <p>The idea is to concatenate all strings into a string appDetails and fill the structure member SReadDIDResponse.DIDValue And here is the structure SReadDIDResponse</p> <pre><code>struct SReadDIDResponse { EComponent ComponentId; //enum values TID nDIDCode; // integer OctetSeq DIDValue; //octet sequence boolean bStatus; }; </code></pre>
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    1. COYou don't show a `flush` in-line with your code. Does it work without?
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    2. CO@ crashmstr-- no Sir. without flush, the same thing persists.
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    3. COWhy don't you `string1 = str.str()`?
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