SendInput Mouse input click only?

Question

How can I make a mouse input with SendInput()? I am entirely confused, I don't understand what it is saying on Microsoft's website. Here is my current code:

if (toggled && (GetKeyState(VK_LBUTTON) & 0x100))
{
    SendInput(UINT, MOUSEINPUT, WM_LBUTTONUP, NULL);
    Sleep((rand() % 1000 / cps));
}

Answer 1

You need to fill out an (array of) INPUT struct(s) containing the mouse details you want, and then you pass that array to SendInput() . This is pretty clearly explained in the SendInput() documentation :

Parameters

cInputs

Type: UINT

The number of structures in the pInputs array.

pInputs

Type: LPINPUT

An array of INPUT structures. Each structure represents an event to be inserted into the keyboard or mouse input stream.

cbSize

Type: int

The size, in bytes, of an INPUT structure. If cbSize is not the size of an INPUT structure, the function fails.

Also, your call to GetKeyState() is wrong, as it will never return a SHORT value that has its 9th bit set to 1. Per the GetKeyState() documentation , only the low (1st) bit or the high (16th) bit will ever be set to 1:

The return value specifies the status of the specified virtual key, as follows:

• If the high-order bit is 1, the key is down; otherwise, it is up.
• If the low-order bit is 1, the key is toggled. A key, such as the CAPS LOCK key, is toggled if it is turned on. The key is off and untoggled if the low-order bit is 0. A toggle key's indicator light (if any) on the keyboard will be on when the key is toggled, and off when the key is untoggled.

So, if your goal is to check if the left mouse button is currently held down, you need to use & 0x8000 (or < 0 ) instead of & 0x100 (even better, consider using GetAsyncKeyState() instead). See Check if left mouse button is held down? .

Try this instead:

if (toggled && (GetKeyState(VK_LBUTTON) < 0 /*& 0x8000*/))
{
    INPUT input = {};
    input.type = INPUT_MOUSE;
    input.mi.dwFlags = MOUSEEVENTF_LEFTUP;
    SendInput(1, &input, sizeof(INPUT));
    Sleep((rand() % 1000 / cps));
}