L prefix for strings in C++

Question

I have a static library. This library have the following function defined

int WriteData(LPTSTR s)

The sample to call the function is

Answer 1

I think you're confused, as your function should work just fine:

int TestFun(LPTSTR lpData)
{
   return  WriteData(lpData); // Should be happy
}

But when you call your function, you'll have to be careful:

TestFun((LPTSTR) L"ABC"); // Will work fine
TestFun((LPTSTR) "ABC");  // Will not work

This is because "ABC" and L"ABC" are two different things. If you look at them in memory:

"ABC"  | 65 66 67 00
L"ABC" | 65 00 66 00 67 00 00 00

Edited to add:

There is nothing like L prefix in .Net

This is just wrong. I just opened "New Project->C++->CLR Console" in VisualStudio, and the first line is:

Console::WriteLine(L"Hello World");