Can't set transparent bg with SetLayeredWindowAttributes

<p>Hi coders, I am using Golang with WinApi wrappers in an attempt to make the background window of my program see-through.</p> <p>In this program I make a window with WinMain and set its background color to black at line 87. I make it always on top at line 55 and that works fine. What doesn&#39;t work is line 57 where I try to key out the black background and get the error &#34;the parameter is incorrect&#34;</p> <p>I have a pastebin here to my code <a href="https://pastebin.com/1qHVTA46" rel="nofollow">https://pastebin.com/1qHVTA46</a></p> <p>here&#39;s the output I get in my console</p> <pre><code>myHWND 16124426 SetLayered r0: 0 SetLayered r1: 0 SetLayered r2: The parameter is incorrect. Last Error: 0 </code></pre> <p>What about my parameters are incorrect? I&#39;ve been at this for a little over an hour and appreciate your consideration! I have seen the api at <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/ms633540(v=vs.85).aspx" rel="nofollow">https://msdn.microsoft.com/en-us/library/windows/desktop/ms633540(v=vs.85).aspx</a></p> <p>p.s. ccolorref is just a dword, which is a uint32 in golang, it can&#39;t be that causing the issue ,can it?</p> <hr/>**评论：**<br/><br/>JHunz: <pre><p>WS_EX_LAYERED is an extended style control value - it needs to be set in the first parameter of CreateWindowEx, not the fourth.</p></pre>69beards: <pre><p>wonderful! works great! bless you &lt;3 <a href="https://i.imgur.com/QC3MuK2.png" rel="nofollow">https://i.imgur.com/QC3MuK2.png</a> I&#39;m gonna go ahead and try drawing using <a href="https://github.com/gonutz/d3d9" rel="nofollow">https://github.com/gonutz/d3d9</a></p> <p>the vectors drawn shouldn&#39;t be invisible too I hope</p></pre>JHunz: <pre><p>No problem, man. I think the vectors shouldn&#39;t be invisible unless you&#39;re drawing them blue, if I&#39;m interpreting everything correctly.</p></pre>