How do you make a typing macro in C++ - c++

Question

I am trying to make a program that when you type "Alt+A" it will write type out a line like "Hello" for example. This is the closest I've gotten:
if (GetAsyncKeyState(65))
{
cout << "worked" << std::endl;
string bind = "Hello";
INPUT Input = { 0 };
Input.type = INPUT_KEYBOARD;
for (int i = 0; i < bind.length(); i++)
{
Input.ki.wVk = VkKeyScanA(bind[i]);
SendInput(1, &Input, sizeof(Input));
}
Sleep(500);
}
It works similar to how I want, but there are some problems that I encountered:
I can't get the Alt key to work. When I use GetAsyncKeyState(18), it runs the "worked" output but it doesn't type out any of the word.
Whenever I press the key bind (for example "A"), it will type that letter as well. Is there any way I can cancel out that key press? I was thinking that I could just make it so that it types the backspace button before the word, but I'm assuming there is a better to go about this.
I also have a problem that the program doesn't type exactly what is put in. It doesn't type capital letters, and it only types one letter if there are two in a row. In the code that I put, it will say "helo" instead of "Hello."

Answer 1

I have made some simple changes to your code, which can basically meet your needs.
But if you need higher functionality, you may need to use RegisterHotKey, and create your window to handle the WM_HOTKEY message.
#include <windows.h>
#include <iostream>
using namespace std;
int main()
{
HWND hwnd = (HWND)0x001E0BF2; //notepad window
SetForegroundWindow(hwnd);
while (1)
{
if (GetAsyncKeyState(18)&0x8000)
{
if (GetAsyncKeyState(65)&0x8000)
{
INPUT keyup_ALT = { 0 };
keyup_ALT.type = INPUT_KEYBOARD;
keyup_ALT.ki.wVk = 18;
keyup_ALT.ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(1, &keyup_ALT, sizeof(INPUT));
cout << "worked" << std::endl;
string bind = "Hello";
INPUT Input[2] = { 0 };
Input[0].type = Input[1].type = INPUT_KEYBOARD;
Input[1].ki.dwFlags = KEYEVENTF_KEYUP;
for (int i = 0; i < bind.length(); i++)
{
short ch = VkKeyScanA(bind[i]);
Input[0].ki.wVk = Input[1].ki.wVk = ch;
if (((ch & 0xff00) >> 8) & 0x1)
{
INPUT shift = { 0 };
shift.type = INPUT_KEYBOARD;
shift.ki.wVk = VK_SHIFT;
SendInput(1, &shift, sizeof(INPUT));
}
SendInput(2, Input, sizeof(INPUT));
if (((ch & 0xff00) >> 8) & 0x1)
{
INPUT shift = { 0 };
shift.type = INPUT_KEYBOARD;
shift.ki.wVk = VK_SHIFT;
shift.ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(1, &shift, sizeof(INPUT));
}
}
Sleep(500);
}
}
}
}
CHANGES:
Add status check of ALT key;
Make the return value of the GetAsyncKeyState and (&) 0x8000;
Make the ALT key up, to resolve "it runs the "worked" output but it
doesn't type out any of the word."
Check the return value of VkKeyScanA, the high-order byte contains
the shift state, which control the capital letters, then determine whether to send shift key.