How do I construct a std::string from a DWORD?

Question

I have following code:

Tools::Logger.Log(string(GetLastError()), Error);

GetLastError() returns a DWORD a numeric

Answer 1

Use Boost's lexical_cast for simple cases such as the above:

Tools::Logger.Log(lexical_cast<string>(GetLastError()), Error);

Answer 2

As all guys here suggested, implementation will use stringstream.
In my current project we created function

template <typename T>
std::string util::str::build( const T& value );

to create string from any source.

So in our project it would be

Tools::Logger.Log( util::str::build(GetLastError()) );

Such usage of streams in the suggested way wouldn't pass my review unless someone wrap it.

Answer 3

what i normally do is:

std::ostringstream oss;
oss << GetLastError() << " :: " << Error << std::endl;
Tools::Logger.Log(oss.str()); // or whatever interface is for logging

Answer 4

You can use STLSoft's winstl::int_to_string(), as follows:

Tools::Logger.Log(winstl::int_to_string(GetLastError()), Error);

Also, if you want to lookup the string form of the error code, you can use STLSoft's winstl::error_desc.

There were a bunch of articles in Dr Dobb's about this a few years ago: parts one, two, three, four. Goes into the subject in great detail, particularly about performance.

Answer 5

You want to read up on ostringstream:

#include <sstream>
#include <string>

int main()
{
   std::ostringstream stream;
   int i = 5;
   stream << i;
   std::string str = stream.str();
} 

Answer 6

Use std::stringstream.

std::stringstream errorStream;
errorStream << GetLastError();
Tools::Logger.Log(errorStream.str(), Error);