Rebar Window fails to create | invalid handle

[xandaz]

   hey guys. I was making a ReBar Controls but Olly gives invalid handle. Can Someone help.Thanks in advance,

Code Select Expand

.elseif uMsg==WM_CREATE
        mov     edi,lParam
        .if     [edi.CREATESTRUCT.hwndParent]==0
                invoke CreateWindowEx,0,addr ReBarClass,addr ReBarName\
                ,WS_VISIBLE+WS_CHILD+RBS_AUTOSIZE+RBS_VERTICALGRIPPER,\
                0,0,MainWindowWidth-10,40,hWnd,0,hInstance,0
                mov     hReBar,eax
       .endif 

[Biterider]

Hi
Use GetLastError to get an indication of what is going wrong.
I suspect the class name is wrong. It should be "ReBarWindow32".

Regards, Biterider

[jj2007]

Olly gives invalid handle

CreateWindowEx may return an error code, but it is valid only if eax==0. Have you checked that? Did you call InitCommonControls before creating the Rebar?

[xandaz]

  it gives invalid_handle_value. ClassName is correct

[Biterider]

Hi
"it gives invalid_handle_value."
The 9th parameter of CreateWindowEx should be the parent window. What is hWnd in your implementation?

Biterider

[xandaz]

 it's hWnd from WndProc.

[xandaz]

   Call to GetLastError gives the same ERROR_INVLID_HANDLE

[xandaz]

    Sorry. Get last error gives 6 as error

[xandaz]

   Is it possible it is a valid handle value?

[Biterider]

Hi
That is OK, ERROR_INVLID_HANDLE = 6.
If the returned value from CreateWindowEx is zero, check the GetLastError value before and after the invocation. This is to make sure that the error value is set.
Check the hWnd value, maybe using it for another call (ShowWindow). Use the debugger to look into the parameters and verify the requirements listed here https://docs.microsoft.com/en-us/windows/win32/controls/create-rebar-controls

Biterider

[xandaz]

ty

[xandaz]

   Works fine with another function... it's one of those things that are before my eyes and i can't see it. thanks a lot

[xandaz]

    Shouldn't hWnd be valid for WM_CREATE message?

[xandaz]

   Don't know what's happening. Tried to creater a Button and hWnd works fine.

[HSE]

Hi!

Have you loaded ICC_COOL_CLASSES in InitCommonControlsEx?