View source for WM SETWINDOWPARAMS

This message occurs when an application sets or changes the window parameters.

;in Button Controls
Occurs when an application sets or changes the button control window procedure window parameters. 

;in Entry Fields
This message occurs when an application sets or changes the entry field control window parameters. 

;in Frame Controls
This message occurs when an application sets or changes the frame control window parameters. 

;in List Boxes
This message occurs when an application sets or changes the list box control window parameters. 

;in Menu Controls
This message occurs when an application sets or changes the menu control window procedure parameters. 

;in Multiline Entry Fields
This message occurs when an application sets or changes the entry field control window parameters. 

==Syntax==
<pre>
param1
    PWNDPARAMS pwndparams; /* Window parameter structure. */

param2
    ULONG      ulReserved; /* Reserved value, should be 0. */
</pre>

===in Circular Slider Controls===
<pre>
param1
     PWNDPARAMS  pwndparams  /*  Pointer to a WNDPARAMS window parameter structure. */

param2
     ULONG       ulReserved  /*  Reserved value, should be 0. */
</pre>

==Parameters==
;''pwndparams'' ([[PWNDPARAMS]]) - input: Pointer to a window parameter structure; see [[WNDPARAMS]]. The valid values of ''fsStatus'' are WPM_TEXT and WPM_CTLDATA.
;''ulReserved'' (ULONG) - input: Reserved value, should be 0.

===in Circular Slider Controls===
;''pwndparams'' ([[PWNDPARAMS]]) - input: Pointer to a [[WNDPARAMS]] window parameter structure.
:This structure contains:
::''status'' ([[ULONG]]): Window parameter selection.
:::Identifies the window parameters that are to be set. The valid value for the slider control is:
::::WPM_TEXT: Window text.
:::The flags in the status field are cleared as each item is processed.
:::If the call is successful, the status field is 0. If any item has not been processed, the flag for that item remains set.
::''length'' ([[ULONG]]): Length of the window text.
::''text'' ([[PSZ]]): Window text.
::''presparamslength'' ([[ULONG]]): Length of presentation parameters.
::''presparams'' (PVOID): Presentation parameters.
::''ctldatalength'' ([[ULONG]]): Length of window class-specific data.
::''ctldata'' (PVOID): Window class-specific data.
;''ulReserved'' ([[ULONG]]): Reserved value, should be 0.

==Returns==
;''rc'' (BOOL) - returns: Success indicator.
:TRUE: Successful operation
:FALSE: Error occurred


==Remarks==
If this message is sent to a window of another process, the information in, or identified by, ''pwndparams'' must be in memory shared by both processes.

===in Button Controls===
The button control window procedure responds to this message by passing it to the default window procedure. 

===in Circular Slider Controls===
If this message is sent to a slider window of another process, the information in, or identified by, the value of the pwndparams field must be in memory shared by both processes.  

===in Entry Fields===
The entry field control window procedure responds to this message by setting the window parameters indicated by the fsStatus parameter of the WNDPARAMS data structure, identified by the pwndparams parameter.

===in Frame Controls===
The frame control window procedure sets the appropriate window parameters in accordance with pwndparams and sets rc to TRUE if the operation is successful, otherwise to FALSE.

The window text of a frame control is set by sending this message to its FID_TITLEBAR. 

===in List Boxes===
The list box control window procedure responds to this message by passing it to the default window procedure. 

===in Menu Controls===
The menu control window procedure responds to this message by passing it to the default window procedure. 

===in Multiline Entry Fields===
The multi-line entry field control window procedure responds to this message by setting the window parameters indicated by the fsStatus parameter of the WNDPARAMS data structure, identified by the pwndparams parameter.

If the MLE text is to be set by this message, it is assumed to be in CF_TEXT format (see MLM_FORMAT) and all existing text is deleted before the new text is inserted. Note that a Control Data structure can be associated with the window parameters, in which case any field in that structure can cause a change to the MLE. 


==Default Processing==
The default window procedure takes no action on this message, other than to set ''rc'' to FALSE.

===in Button Controls===
The default window procedure takes no action on this message, other than to set ''rc'' to FALSE.

===in Entry Fields===
The default window procedure takes no action on this message, other than to set ''rc'' to FALSE. 

===in List Boxes===
The default window procedure takes no action on this message, other than to set result to FALSE. 

===in Menu Controls===
The default window procedure takes no action on this message, other than to set rc to FALSE. 

===in Multiline Entry Fields===
The default window procedure takes no action on this message, other than to set rc to FALSE. 

==Related Messages==
* WM_SETWINDOWPARAMS (in Button Controls)
* WM_SETWINDOWPARAMS (in Entry Fields)
* WM_SETWINDOWPARAMS (in Frame Controls)
* WM_SETWINDOWPARAMS (in List Boxes)
* WM_SETWINDOWPARAMS (in Menu Controls)
* WM_SETWINDOWPARAMS (in Multiline Entry Fields)
* WM_SETWINDOWPARAMS (in Scroll Bars)
* WM_SETWINDOWPARAMS (in Static Controls)
* WM_SETWINDOWPARAMS (in Title Bar Controls)

[[Category:Messages]]