RegisterWindowMessage and SendMessage

New to Julia
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4

Sorry, I still can’t figure out how to fix your code. Have you tried implementing this in another language?

Anyway, I extracted an example from my code:

const WM_CLOSE = 0x000010

function findwindowex(class::AbstractString, child::Ptr{Int32})
    hwnd = ccall((:FindWindowExA, "user32"), Ptr{Int32}, 
                (Ptr{Int32}, Ptr{Int32}, Cstring, Cstring),
                Ptr{Int32}(), child, class, C_NULL)
    return hwnd
end

function sendmessage(hwnd::Ptr{Int32}, msg::UInt32, wparam::Ptr{Int32}, lparam::Ptr{Int32})
    ccall((:SendMessageA, "user32"), Int32, 
            (Ptr{Int32}, UInt32, Ptr{Int32}, Ptr{Int32}),
            hwnd, msg, wparam, lparam)
end

function main()
    hwnd = findwindowex("Notepad", Ptr{Int32}())
    sendmessage(hwnd, WM_CLOSE, Ptr{Int32}(), Ptr{Int32}())
end

This should close Notepad.