Description
Hello,
I have a C# function that is getting invoked from a C++ executable. In this function, I am attempting to do the literal equivalent of
int number;
std::cin >> number;
Obviously I could do something like number = int.Parse(Console.ReadLine()), but in this case I really need to do exactly what C++ is doing (and besides, what fun would that be?). Leveraging a decompiler to get the exact mangled names, I came up with this code:
int number= 0;
using (var l = new ConariL(@"c:\windows\system32\MSVCP140.dll"))
{
var cin = l.ExVar.getVar<IntPtr>("?cin@std@@3V?$basic_istream@DU?$char_traits@D@std@@@1@A");
l.bind<FuncOut2<IntPtr, int, IntPtr>>("??5?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@AEAH@Z").Invoke(cin, out number);
}
The function binding works correctly, but it throws an access violation inside of the function because the address of cin is incorrect. The intptr returned by getVar is 0x00007ffe2a0cc110, which the Visual Studio debugger tells me is the address of std::basic_istream<char,std::char_traits<char>>:: vbtable', not of std::basic_istream<char,std::char_traits<char>> std::cin. Indeed, if I put std::cout << &(std::cin); in the C++ app, it outputs 00007FFE2A0F7200, which Visual Studio agrees is correct.
If I force 00007FFE2A0F7200 into my cin variable instead of getting it with getVar, the function executes correctly, prompting for user input and storing it in number.