Question

I have written to code to read and write to registry which is working fine in all the OS except the win2003. Basically after setting value in registry(RegSetValueExW) I am able to read it correctly (RegQueryValueExW). But when i open regedit, i see some junk characters in it.

open using

RegOpenKeyExW(HKEY_LOCAL_MACHINE, subKey , 0, KEY_WRITE | KEY_WOW64_64KEY, &_regKey);

to set: (value is wstring)

::RegSetValueExW(_regKey, key, NULL, REG_MULTI_SZ, reinterpret_cast<const BYTE*>(value.c_str()), static_cast<DWORD>(value.length()*2 + 1));

for query:

::RegQueryValueExW(regKey, key, NULL, &type, reinterpret_cast<LPBYTE>(&value[0]), &valueLength);

Answer 1

From the MSDN manual page on RegSetValueExW:

With the REG_MULTI_SZ data type, the string must be terminated with two null characters.

You need to construct a BYTE array containing two terminator characters and pass it to the function.