Convert HRESULT hex error code to string

Hi all,



Is there a way to convert an HRESULT hex error code to a string? To better illustrate this, here is a sample code:



HRESULT hr = CoInitialize(NULL);

if(FAILED(hr))
{
//This is what I want to store into a string.
//"Failed to Initialize COM. Error code = 0x" << hex << hr << endl;

string hexerrorcode = ?;

CoUninitialize();
return 0;
}

I am not sure how to put it into string.



Can anyone help me with this?



Thank you!

Something like this (works for most windows error codes):

Code:

---


void ErrorMessage(DWORD dwError)
{
    LPVOID pText = 0;

    ::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
              NULL,dwError,MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),(LPWSTR)&pText,0,NULL);
    MessageBox(NULL,(LPCWSTR)pText,0,MB_OK);
    LocalFree(pText);
}

---

Code:

---

#include <string>
#include <sstream>

std::ostringstream oss;
oss << "Failed to Initialize COM. Error code = 0x" << std::hex << hr << std::endl;
std::string hexerrorcode = oss.str();

---

Sorry, I misread the question.

With printf-family of functions you can simply use &#37;x or %X format specifier!