Get Full Version String (win)

get_full_version_string.cpp

// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724429(v=vs.85).aspx

#include <vector>
#include <cstdio>
#include <windows.h>

std::wstring GetFullVersionString()
{
	struct LANGCODEPAGE {
		WORD wLang;
		WORD wCode;
	} *lpTranslate;

	UINT cbTranslate;
	
	std::vector<wchar_t> path_buffer(MAX_PATH, L'\0');
	auto result = GetSystemDirectory(path_buffer.data(), path_buffer.size());
	if(result == 0) {
		return L"";
	}

	auto dll_path = std::wstring(path_buffer.begin(), path_buffer.begin() + result) + L"\\Kernel32.dll";

	auto size = GetFileVersionInfoSize(dll_path.c_str(), NULL);
	std::vector<char> buffer(size);
	GetFileVersionInfo(dll_path.c_str(), NULL, size, buffer.data());
	VerQueryValue(buffer.data(), L"VarFileInfo\\Translation", (LPVOID*)&lpTranslate, &cbTranslate);

	if(cbTranslate < sizeof(LANGCODEPAGE)) {
		return L"";
	}

	wchar_t query[512];
	_snwprintf(query, sizeof(query), L"\\StringFileInfo\\%04x%04x\\ProductVersion", lpTranslate[0].wLang, lpTranslate[0].wCode);
	wchar_t const *p;
	UINT n_chars;
	VerQueryValue(buffer.data(), query, (LPVOID *)&p, &n_chars);
	return std::wstring(p, p + n_chars);
}

int main()
{
	std::wstring full_version_string = GetFullVersionString();
}