[Visual Basic derp] Send keystroke through SendMessage/PostMessage

[myojinyahiko]

Hey guys, I've made a simple program to send a keystroke to WoW for automated DE/Milling/Prospecting for myself and to post here for others.

Right now I have

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long
    Private Const EM_REPLACESEL = &HC2

sproc = System.Diagnostics.Process.GetProcessById(CB1.SelectedItem)
        SendString = StrokeTB.Text
        WowHwnd = sproc.MainWindowHandle

ret = SendMessage(WowHwnd, EM_REPLACESEL, 0&, SendString)

I know the process ID is correct, not sure if the parameters are incorrect or if I'm grabbing the wrong handle. Running it works but nothing happens in-game then the stack becomes unbalanced.

Any ideas? I'm not huge into coding but I have a basic grasp of it. I know I should at least be using C++ but I've never learned it well enough to try to do this.

If this is a dumb question then let me know and I'll just delete thread =3

Edit: V 5.1.0 (16357)
Also not sure if I should move this to Bots Questions forum since this technically isn't memory reading/writing, if anyone thinks that I should move it lemme know and I will.

Thanks in advance.

[JuJuBoSc]

u need to use WM_CHAR for each char in your string with SendMessage

[myojinyahiko]

I'll look that up now, only going to be one character. Thanks

Edit: Still not working. =/

Const WM_CHAR = &H102

ret = SendMessage(WowHwnd, WM_CHAR, 45, SendString)

Pretty sure the WM_CHAR constant is right.

I'm somewhat confused on parameters though. Was testing this with "-" which is 45 in decimal. I could be doing that all wrong though.

I'm starting to wonder if the main window handle is what I need to be sending it too, if it isn't I have no clue which child to send it to =3

Still just getting an unbalanced stack.

I had tried SendInput a while ago and didn't get any results either. Anyone have any ideas on what I should be trying? Sorry for being so awful =/

[Bananenbrot]

The wParam isn't marshaled as string. https://github.com/Bananenbrot/Keybo...sageEmitter.cs and have a closer look at msdn.

[JuJuBoSc]

foreach (char c in Text)
                SendMessage(Memory.WowWindowHandle, WM_CHAR, (uint)c, 0);

[myojinyahiko]

Still running into the same problems. I'm just going to give up for now. Thanks though guys.

[siriuz]

you should use spy++ to see what happens if you press a specific key

in example for an space keystroke you have to send something like this:

SendMessage(hWnd, WM_KEYDOWN, VK_SPACE, IntPtr.Zero);
SendMessage(hWnd, WM_KEYUP, VK_SPACE, IntPtr.Zero);

[myojinyahiko]

you should use spy++ to see what happens if you press a specific key

in example for an space keystroke you have to send something like this:

SendMessage(hWnd, WM_KEYDOWN, VK_SPACE, IntPtr.Zero);
SendMessage(hWnd, WM_KEYUP, VK_SPACE, IntPtr.Zero);

Spy is showing those lines sending and then receiving WM_NULL then stack unbalances. In game, pressing Q, I get WM_KEYDOWN (wParam 00000051, lParam 00100001), WM_CHAR (wParam 00000051, lParam 00100001), then WM_KEYUP (wParam 00000051, lParam C0100001) all posted rather than sent. Going to try posting those 3 with those parameters to try to emulate that, but still confused why the above two lines were shown as WM_NULL.

Edit:
Posting shows nothing on Spy and it is still unbalancing the stack. =/

[siriuz]

but still confused why the above two lines were shown as WM_NULL./

I guess u didn't defined WM_KEYDOWN, WM_KEYUP, VK_SPACE ?

In C# that would be like:

const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
const int VK_SPACE = 0x20;

[myojinyahiko]

They were defined with what I found on google.

Const WM_KEYUP = &H101
Const WM_KEYDOWN = &H100

I defined VK_SPACE correctly too when got the null.

[siriuz]

In C# this work like a charm:

[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr thWnd, int msg, int wParam, IntPtr lParam);

const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
const int VK_SPACE = 0x20;

Process[] pr = Process.GetProcessesByName("wow");
IntPtr hWnd_wow = Process.GetProcessById(pr[0].Id).MainWindowHandle;

SendMessage(hWnd_wow, WM_KEYDOWN, VK_SPACE, IntPtr.Zero);
SendMessage(hWnd_wow, WM_KEYUP, VK_SPACE, IntPtr.Zero);

Maybe you can port it ...