MAKEINTRESOURCE((id>>4)+1) 是什么意思？

Question

I am trying to mimic the behavior of CString::LoadString(HINSTANCE hInst, DWORD id, WORD langID) without introducing a dependency on MFC into my app. So I walked through the source. The first thing it does is to immediately call AtlGetStringResourceImage(hInst, id, langID) , and then this in turn contains the following line of code:

    hResource = ::FindResourceExW(hInst, (LPWSTR)RT_STRING, MAKEINTRESOURCEW((id>>4)+1), langID);

(It's not verbatim like this, but I trimmed out some unimportant stuff).

What is the meaning of shifting the ID by 4 and adding 1? According to the documentation of FindResourceEx, you should pass in MAKEINTRESOURCE(id) , and I can't find any example code that is manipulating the id before passing it to MAKEINTRESOURCE . At the same time, if I make my code call MAKEINTRESOURCE(id) then it doesn't work and FindResourceEx returns null, whereas if I use the above shift + add, then it does work.

Can anyone explain this?

Answer 1

From the STRINGTABLE resource documentation:

RC allocates 16 strings per section and uses the identifier value to determine which section is to contain the string. Strings whose identifiers differ only in the bottom 4 bits are placed in the same section.

The code you are curious about locates the section a given string identifier is stored in by ignoring the low 4 bits.