SendInput() Keyboard letters C/C++

Question

I am trying to use SendInput() to send a sentence to another application (Notepad) and then send it hitting the Enter Key.

Any code snippets?

Answer 1

I made a modification after reading @Nathan's code, this reference and combined with @jave.web's suggestion. This code can be used to input characters (both upper-case and lower-case).

#define WINVER 0x0500
#include<windows.h>
void pressKeyB(char mK)
{
    HKL kbl = GetKeyboardLayout(0);
    INPUT ip;
    ip.type = INPUT_KEYBOARD;
    ip.ki.time = 0;
    ip.ki.dwFlags = KEYEVENTF_UNICODE;
    if ((int)mK<65 && (int)mK>90) //for lowercase
    {
        ip.ki.wScan = 0;
        ip.ki.wVk = VkKeyScanEx( mK, kbl );
    }
    else //for uppercase
    {
        ip.ki.wScan = mK;
        ip.ki.wVk = 0;

    }
    ip.ki.dwExtraInfo = 0;
    SendInput(1, &ip, sizeof(INPUT));
}

Below is the function for pressing Return key:

    void pressEnter()
{
    INPUT ip;
    ip.type = INPUT_KEYBOARD;
    ip.ki.time = 0;
    ip.ki.dwFlags = KEYEVENTF_UNICODE;
    ip.ki.wScan = VK_RETURN; //VK_RETURN is the code of Return key
    ip.ki.wVk = 0;

    ip.ki.dwExtraInfo = 0;
    SendInput(1, &ip, sizeof(INPUT));

}

Answer 2

INPUT input;
WORD vkey = VK_F12; // see link below
input.type = INPUT_KEYBOARD;
input.ki.wScan = MapVirtualKey(vkey, MAPVK_VK_TO_VSC);
input.ki.time = 0;
input.ki.dwExtraInfo = 0;
input.ki.wVk = vkey;
input.ki.dwFlags = 0; // there is no KEYEVENTF_KEYDOWN
SendInput(1, &input, sizeof(INPUT));

input.ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(1, &input, sizeof(INPUT));

List of virtual key codes .....

Answer 3

The SendInput function accepts an array of INPUT structures. The INPUT structures can either be a mouse or keyboard event. The keyboard event structure has a member called wVk which can be any key on the keyboard. The Winuser.h header file provides macro definitions (VK_*) for each key.

Answer 4

Theres a simple C++ sample here http://nibuthomas.wordpress.com/2009/08/04/how-to-use-sendinput/

And a more complete VB sample here http://vb.mvps.org/samples/SendInput/