1 files changed, 93 insertions, 0 deletions
diff --git a/utils.h b/utils.h
new file mode 100644
index 0000000..aa9d43f
--- /dev/null
+++ b/utils.h
@@ -0,0 +1,93 @@
+#pragma once
+
+// ------------------------------------------------------------------------------------------
+// Structure and operators to insert a zero-filled hex-formatted number into a std::ostream.
+struct HEX
+{
+    HEX(unsigned long num, unsigned long fieldwidth = 8, bool bUpcase = false)
+        : m_num(num), m_width(fieldwidth), m_upcase(bUpcase)
+        {}
+
+    unsigned long m_num;
+    unsigned long m_width;
+    bool m_upcase;
+};
+
+inline std::ostream& operator << ( std::ostream& os, const HEX & h )
+{
+    int fmt = os.flags();
+    char fillchar = os.fill('0');
+    os << "0x" << std::hex << (h.m_upcase ? std::uppercase : std::nouppercase) << std::setw(h.m_width) << h.m_num ;
+    os.fill(fillchar);
+    os.flags(fmt);
+    return os;
+}
+
+inline std::wostream& operator << ( std::wostream& os, const HEX & h )
+{
+    int fmt = os.flags();
+    wchar_t fillchar = os.fill(L'0');
+    os << L"0x" << std::hex << (h.m_upcase ? std::uppercase : std::nouppercase) << std::setw(h.m_width) << h.m_num ;
+    os.fill(fillchar);
+    os.flags(fmt);
+    return os;
+}
+
+
+// ------------------------------------------------------------------------------------------
+
+// Convert an error code to corresponding text, returning it as a std::wstring.
+
+inline std::wstring SysErrorMessageWithCode(DWORD dwErrCode /*= GetLastError()*/)
+{
+    LPWSTR pszErrMsg = NULL;
+    std::wstringstream sRetval;
+    DWORD flags =
+        FORMAT_MESSAGE_ALLOCATE_BUFFER |
+        FORMAT_MESSAGE_IGNORE_INSERTS |
+        FORMAT_MESSAGE_FROM_SYSTEM ;
+
+    if ( FormatMessageW(
+        flags,
+        NULL,
+        dwErrCode,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+        (LPWSTR) &pszErrMsg,
+        0,
+        NULL ) )
+    {
+        sRetval << pszErrMsg << L" (Error # " << dwErrCode << L" = " << HEX(dwErrCode) << L")";
+        LocalFree(pszErrMsg);
+    }
+    else
+    {
+        sRetval << L"Error # " << dwErrCode << L" (" << HEX(dwErrCode) << L")";
+    }
+    return sRetval.str();
+}
+
+// Convert std::string to std::wstring
+std::wstring s2ws(const std::string& s)
+{
+    int len;
+    int slength = (int)s.length() + 1;
+    len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);
+    wchar_t* buf = new wchar_t[len];
+    MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
+    std::wstring r(buf);
+    delete[] buf;
+    return r;
+}
+
+// Convert std::wstring to std::string
+std::string ws2s(const std::wstring& s)
+{
+    int len;
+    int slength = (int)s.length() + 1;
+    len = WideCharToMultiByte(CP_ACP, 0, s.c_str(), slength, 0, 0, 0, 0);
+    char* buf = new char[len];
+    WideCharToMultiByte(CP_ACP, 0, s.c_str(), slength, buf, len, 0, 0);
+    std::string r(buf);
+    delete[] buf;
+    return r;
+}