How to access member of a class during inside callback function ? #247
Description
The following program is crashing when I am trying to access invoke std::string t = config.Test("test"); in the callback cb. The reason looks to because config is not able to access the memory (?). Can some please explain why this is happening even though I have already passed this to the callback? And how can i fix this issue? TIA!
#include <iostream>
#include <krabs.hpp>
using namespace std;
const krabs::guid KernelProcessProviderId = krabs::guid(L"{22FB2CD6-0E7B-422B-A0C7-2FAD1FD0E716}");
class DependencyCheckerConfig {
private:
// assignment and copy not needed
DependencyCheckerConfig(const DependencyCheckerConfig&);
DependencyCheckerConfig& operator=(const DependencyCheckerConfig&);
private:
const std::string test = "test-string";
public:
DependencyCheckerConfig() {}
std::string Test(std::string t) const
{
std::cout << "Test :" << t <<std::endl;
return test;
}
};
class DepenedencyChecker {
public:
DepenedencyChecker(const DependencyCheckerConfig& config) : config(config) {
Init();
}
void Start() {
m_trace->start();
}
void Stop() {
m_trace->stop();
}
private:
std::unique_ptr<krabs::user_trace> m_trace;
std::unique_ptr<krabs::provider<>> m_process_provider;
std::unique_ptr<krabs::event_filter> m_processEventFilter;
const DependencyCheckerConfig& config;
void Init() {
m_trace = std::make_unique<krabs::user_trace>(L"Test-Trace-Kernel");
EVENT_TRACE_PROPERTIES m_properties = { 0 };
m_properties.LogFileMode = EVENT_TRACE_REAL_TIME_MODE | EVENT_TRACE_INDEPENDENT_SESSION_MODE;
m_trace->set_trace_properties(&m_properties);
m_process_provider = std::make_unique<krabs::provider<>>(KernelProcessProviderId);
m_processEventFilter = std::make_unique<krabs::event_filter>(std::vector<unsigned short>{5});
auto cb = [this](const EVENT_RECORD& record, const krabs::trace_context& trace_context)
{
krabs::schema schema(record, trace_context.schema_locator);
krabs::parser parser(schema);
cout << "im here" << endl;
std::string t = config.Test("test");
cout << t << endl;
if (schema.event_id() == 5)
{
auto imageName = parser.parse<std::wstring>(L"ImageName");
auto processID = parser.parse<uint32_t>(L"ProcessID");
std::wcout << L"IMAGE LOAD Event " +
std::to_wstring(schema.event_id()) +
L" ProcessID " + std::to_wstring(processID) +
L" imageName " + imageName << std::endl;
}
};
m_processEventFilter->add_on_event_callback(cb);
m_process_provider->add_filter(*m_processEventFilter);
m_trace->enable(*m_process_provider);
}
};
int main() {
DependencyCheckerConfig config;
DepenedencyChecker checker(config);
checker.Start();
return 0;
}