CppRest SDK(Casablanca) + static CRT link = caution! (might cause debug heap assert)

2016-07-06T04:36:53+09:00

Thanks. I meet the same problem today with cpprestsdk at version 2.8.0.
And I found another problem that is i got lots of memory leaks when my program exit.
Is there anyway to fix it?

Reply

2016-07-06T07:02:55+09:00

If you’re developing it on the Windows, the latest service pack with Visual Studio 2015 supports new memory debug window which shows where the leaks are originated. For example, the VS 2015 provides the way making memory snapshot and comparing it between snapshots. Then it shows the location where the object allocated.Please refer to https://www.youtube.com/watch?v=HUZW8m_3XvE

Or, there’s great too called ‘gflags’. You can also enable the Full PageHeap, and dump the memory allocation information with ‘heap -p command’ within WinDbg. (which illustrated in the above content)

Thanks.

Reply

2016-07-06T15:51:58+09:00

Hi,
Thanks for your reply.
I don’t know how to use gflags to detect memory leaks.
Here’s my environment:
VS2013, win32 console application, MFC support, cpprestsdk 2.8.0 by nuget

The code is :
// Testtt.cpp : Defines the entry point for the console application.
//

#include “stdafx.h”
#include “Testtt.h”

#include
#include
#include
#include

using namespace web;
using namespace http;
using namespace utility;
using namespace http::experimental::listener;
using namespace concurrency::streams;

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

class CommandHandler
{
public:
CommandHandler(){}
CommandHandler(utility::string_t url);
pplx::task open() { return m_listener.open(); }
pplx::task close() { return m_listener.close(); }
private:
void handle_get(http_request message);

http_listener m_listener;
};

CommandHandler::CommandHandler(utility::string_t url) : m_listener(url)
{
m_listener.support(methods::GET, std::bind(&CommandHandler::handle_get, this, std::placeholders::_1));

}

void CommandHandler::handle_get(http_request message)
{
ucout << "Method: " << message.method() << std::endl;
ucout << "URI: " << http::uri::decode(message.relative_uri().path()) << std::endl;
ucout << "Query: " << http::uri::decode(message.relative_uri().query()) << std::endl << std::endl;

message.reply(status_codes::OK, "ACCEPTED");
}

// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;

HMODULE hModule = ::GetModuleHandle(NULL);

if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
try
{
ucout.imbue(std::locale("chs"));

string_t address = U("http://*:8090");
uri_builder uri(address);
auto addr = uri.to_uri().to_string();
CommandHandler handler(addr);
handler.open().wait();
ucout << U("Listening for request at: ") << addr << std::endl;
ucout << U("Press key to quit…") << std::endl;

std::string line;
std::getline(std::cin, line);
handler.close().wait();
}
catch (std::exception ex)
{
ucout << U("Exception: ") << ex.what() << std::endl;
ucout << U("Press EnterKey to quit….") << std::endl;
std::string line;
std::getline(std::cin, line);
}
}
}
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failed\n"));
nRetCode = 1;
}

return nRetCode;
}

Then i start debugging, It looks run well.
But after executing, I've been report lots of memory leaks. Is this my fault or a bug in cpprestsdk2.8.0?

By the way. Are u chinese? I am chinese. 🙂

Reply

	#include <cpprest\json.h>
	#include <string>

	int _tmain(int argc, _TCHAR* argv[])
	{

	web::json::value root;

	std::wstring filepath = L"config.json";
	std::ifstream ifs;

	ifs.open(filepath.c_str(), std::ifstream::in);

	if (ifs)
	{
	try {
	auto jsonResult = web::json::value::parse(ifs);

	auto value = jsonResult.at(L"key").as_string();
	auto value2 = jsonResult.at(L"anotherkey").as_string();
	auto value3 = jsonResult.at(L"last").as_string();

	}
	catch (const std::exception& e) {
	std::string reason = e.what();
	}

	return 0;
	}

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CppRest SDK(Casablanca) + static CRT link = caution! (might cause debug heap assert)

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Published by Heejune

3 thoughts on “CppRest SDK(Casablanca) + static CRT link = caution! (might cause debug heap assert)”

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