SendInput wrong Parameter

Question

I wanted to improve my SendInput() function but came across an error.

ERROR_INVALID_PARAMETER
87 (0x57)

The parameter is incorrect.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx

I am a bit confused which parameter should not be correct.

If I have forgotten something do not hesitate to ask.

INPUT in[6] = {0};

//Press Enter Key
in[0].type = INPUT_KEYBOARD;
in[0].ki.wScan = 0;
in[0].ki.dwFlags = 0;
in[0].ki.time = 0;
in[0].ki.dwExtraInfo = 0;
in[0].ki.wVk = VK_RETURN;

//release enter key
in[1] = in[0];
in[1].ki.dwFlags = KEYEVENTF_KEYUP;

//Hold Shift key and press key 7
in[2].type = INPUT_KEYBOARD;
in[2].ki.wScan = 0;
in[2].ki.dwFlags = 0;
in[2].ki.time = 0;
in[2].ki.dwExtraInfo = 0;
in[2].ki.wVk = VK_SHIFT;

in[3].type = INPUT_KEYBOARD;
in[3].ki.wScan = 0;
in[3].ki.dwFlags = 0;
in[3].ki.time = 0;
in[3].ki.dwExtraInfo = 0;
in[3].ki.wVk = 0x37;

//release key 7
in[4] = in[3];
in[4].ki.dwFlags = KEYEVENTF_KEYUP;

//release key shift
in[5] = in[2];
in[5].ki.dwFlags = KEYEVENTF_KEYUP;

if (SendInput(6, in, sizeof(in)) == 0)
{
std::cout << "Uppps some error in SendInput: " << GetLastError() << std::endl;
}

I know that my english is not the best, although I have tried very hard to make the question clear and will be voted down immediately. I would like to know what it is to make it better next time. thx — Lendoria
– Lendoria, Commented Jun 15, 2018 at 11:48

Lendoria · Accepted Answer · 2018-06-15 11:44:51Z

7

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

SendInput(6, in, sizeof(INPUT));

Oups...

answered Jun 15, 2018 at 11:44

Lendoria

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Comments

David Heffernan · Accepted Answer · 2018-06-15 11:47:27Z

1

The documentation says of cbSize:

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

You are passing sizeof(in), the size of the entire array. Instead pass sizeof(INPUT).

answered Jun 15, 2018 at 11:47

David Heffernan

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