How to Send Multiple Characters with SendInput()?

Sending Multiple Characters with SendInput

Question:

How can SendInput be used to send more than one character?

Answer:

SendInput() accepts multiple INPUT structures. Each INPUT structure represents a single key event (press or release). To send multiple characters, create an array of INPUT structures and specify the correct virtual key codes or Unicode codepoints.

Correct Code for Sending Two Characters:

<code class="c++">#include <array>

int main() {
    array<INPUT, 4> in;
    
    // KEYEVENTF_UNICODE specifies using Unicode codepoints
    in[0].type = INPUT_KEYBOARD;
    in[0].ki.dwFlags = KEYEVENTF_UNICODE;
    in[0].ki.wScan = 0;
    in[0].ki.time = 0;
    in[0].ki.dwExtraInfo = 0;
    in[0].ki.wVk = VkKeyScanW('S');  // 'S' character

    in[1].type = INPUT_KEYBOARD;
    in[1].ki.dwFlags = KEYEVENTF_UNICODE | KEYEVENTF_KEYUP;
    in[1].ki.wScan = 0;
    in[1].ki.time = 0;
    in[1].ki.dwExtraInfo = 0;
    in[1].ki.wVk = VkKeyScanW('S');  // 'S' character

    in[2].type = INPUT_KEYBOARD;
    in[2].ki.dwFlags = KEYEVENTF_UNICODE;
    in[2].ki.wScan = 0;
    in[2].ki.time = 0;
    in[2].ki.dwExtraInfo = 0;
    in[2].ki.wVk = VkKeyScanW('T');  // 'T' character

    in[3].type = INPUT_KEYBOARD;
    in[3].ki.dwFlags = KEYEVENTF_UNICODE | KEYEVENTF_KEYUP;
    in[3].ki.wScan = 0;
    in[3].ki.time = 0;
    in[3].ki.dwExtraInfo = 0;
    in[3].ki.wVk = VkKeyScanW('T');  // 'T' character

    SendInput(in.size(), &in[0], sizeof(INPUT));

    return 0;
}</code>

Important Note:

• Virtual Keys: Use KEYEVENTF_UNICODE to use Unicode codepoints instead of virtual keys.
• UNICODE Codepoints: Surrogate pairs are required to send characters outside the Basic Multilingual Plane (BMP).
• Number of INPUT Structures: The first parameter of SendInput() specifies the number of INPUT structures.

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