Map missing chars on italian keyboards - windows

Question

I would like map a chars that doesn't exists on my keyboard layout is it possible?
My keyboard layout is italian and the the chars is ~ and `
I would like remap when I press AltGr (VK_RMENU) + VK_OEM_4 or VK_OEM_6.
But this chars aren't in Virtual-Key Codes list, so I think I coud't use SendInput for remapping...
For others chars SendInput works

Answer 1

But this chars aren't in Virtual-Key Codes list, so I think I coud't
use SendInput for remapping...
The ~ and ` are in the Virtual-Key Codes list. It is VK_OEM_3 (0xC0).
You can use SendInput enter ~ and ` like this:
UINT result = 0;
DWORD errCode = 0;
tagINPUT inputArray[2] = {};
tagKEYBDINPUT keyboardInput[2] = {};
keyboardInput[1].wVk = 0xC0; // Virtual-Key code for the '`~' key.
keyboardInput[1].wScan = 0x29; // Scan code for the '`~' key.
inputArray[1].type = INPUT_KEYBOARD;
inputArray[1].ki = keyboardInput[1];
keyboardInput[0].wVk = 0x10; // Virtual-Key code for the 'shift' key.
keyboardInput[0].wScan = 0x2A; // Scan code for the 'shift' key.
inputArray[0].type = INPUT_KEYBOARD;
inputArray[0].ki = keyboardInput[0];
// Enter '~' (shift + '`~' key)
result = SendInput(2, inputArray, sizeof(tagINPUT));
errCode = GetLastError();
// Enter '`'
result = SendInput(1, &inputArray[1], sizeof(tagINPUT));
errCode = GetLastError();
If you want to enter these two chars the SendMessage also can do this (similar issue):
LPCWSTR Target_window_Name = TEXT("Untitled - Notepad"); //<- Has to match window name
HWND hWindowHandle = FindWindow(NULL, Target_window_Name);
HWND EditClass = FindWindowEx(hWindowHandle, NULL, L"Edit", NULL);
SendMessage(EditClass, WM_KEYDOWN, 0xC0, 0x002C0001); //VK_OEM_3 0xC0
SendMessage(EditClass, WM_CHAR, 0x7E, 0x002C0001); //~
SendMessage(EditClass, WM_KEYUP, 0xC0, 0xC02C0001);
SendMessage(EditClass, WM_KEYDOWN, 0xC0, 0x002C0001); //VK_OEM_3 0xC0
SendMessage(EditClass, WM_CHAR, 0x60, 0x002C0001); //`
SendMessage(EditClass, WM_KEYUP, 0xC0, 0xC02C0001);
References: "SendInput" "SendMessage"
For scan code you can search "Keyboard Scan Code Specification - Microsoft".