about using EM_SETBKGNDCOLOR message

[vega]

I don't know it's correct meaning that explanations in API Help comments as follow,

--------------------------------------
The EM_SETBKGNDCOLOR message sets the background color for a rich edit control.

EM_SETBKGNDCOLOR 
wParam = (WPARAM) (BOOL) fUseSysColor;
lParam = (LPARAM) (COLORREF) clr;


Parameters:

fUseSysColor
Value specifying whether to use the system color.
If this parameter is nonzero, the background is set to the window background system color.
Otherwise, the background is set to the specified color.

clr
COLORREF structure specifying the color if fUseSysColor is zero.
--------------------------------------

in my test,
this case(none system Color change mode) is OK.(Color is changed)

   ;change current window's Background color to RED
   INVOKE SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 0, 000000FFh         

but, this one(system Color change mode) is not OK, (not changed)

   ;change all opened window's backGround color
   INVOKE SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, 000000FFh

What's Wrong?           

-asm.Student-

[zooba]

What's Wrong?

Don't know. You're meant to tell us that. Is the colour not changing? Or is it not the default system colour? Is it still setting it to red?

As far as I can tell, your code is fine.

Cheers,

Zooba :U

[vega]

Yes, Color is not changes to specified color in these cases.


  INVOKE SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, 000000FFh

  or

  INVOKE SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, ADDR BackGroundColorStruc 

  or

  INVOKE SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, ADDR BackGroundColorStruc.rgbResult

[ramguru]

I've tested, and it worked! Usually window_background color is white so you may think nothing changed, try setting other color in "Properties->Appearance->Advanced->Window->color1"

[vega]

I've tested, and it worked! Usually window_background color is white so you may think nothing changed, try setting other color in "Properties->Appearance->Advanced->Window->color1"

Is this Api-help sentence
   " If this parameter is nonzero, the background is set to the window background system color. "
means
   " If this parameter is nonzero, the Current window's background is set to the window's Default background color, only. "   ?

[ramguru]

Sorry I don't get your point  :( (what you're trying to prove or ask)
...but I think
invoke SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, ...
...is used to restore initial (what it was before any changes) background color of richedit control, that's all its purpose.

[vega]

Oh..yes, I see.
Just, I undertood this problem.
Thank you very much, ramguru.
Thank you!  :bg

[vega]

and then,
in this case, Is it possible to dispense with last parameter(lParam) ?

  " invoke SendMessage, hRichEdit, EM_SETBKGNDCOLOR, 1, lParam "

[ramguru]

I'm sure that as long first parameter is 1 second one can be whatever you like: 1, -1, 0, lParam, wParam

[vega]

Yes, I see.
I understood sufficiently.
Thanks a lots for your Good teaching..!
:U