WinSetClassThunkProc: Difference between revisions
Created page with "This function associates a pointer-conversion procedure with a window class. ==Syntax== WinSetClassThunkProc(pszClassName, pfnThunkProc) ==Parameters== ;''pszClassName'' (..." |
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This function associates a pointer-conversion procedure with a window class. | This function associates a pointer-conversion procedure with a window class. | ||
==Syntax== | ==Syntax== | ||
| Line 5: | Line 5: | ||
==Parameters== | ==Parameters== | ||
;''pszClassName'' (PSZ) - input | ;''pszClassName'' (PSZ) - input:Window-class name. | ||
:Window-class name. | ;''pfnThunkProc'' (PFN) - input:Pointer-conversion procedure identifier. | ||
:;NULL:Any existing pointer-conversion procedure is dissociated from this class. | |||
::By default, a class has no pointer-conversion procedure associated with it. | |||
:;Other:The pointer-conversion procedure to be associated with this class. | |||
==Returns== | ==Returns== | ||
;rc (BOOL) - returns | ;rc (BOOL) - returns:Success indicator. | ||
:Success indicator. | :;TRUE:Successful completion | ||
:;TRUE | :;FALSE:An error occurred. | ||
:;FALSE | |||
==Remarks== | ==Remarks== | ||
This function does not alter the pointer-conversion procedure associated with any existing window. It changes the pointer-conversion procedure that will be associated with a window created with a subsequent WinCreateWindow or WinCreateStdWindow function. | This function does not alter the pointer-conversion procedure associated with any existing window. It changes the pointer-conversion procedure that will be associated with a window created with a subsequent [[WinCreateWindow]] or [[WinCreateStdWindow]] function. | ||
==Example Code== | ==Example Code== | ||
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#define INCL_WINWINDOWMGR | #define INCL_WINWINDOWMGR | ||
#define INCL_WINTHUNKAPI | #define INCL_WINTHUNKAPI | ||
#include < | #include <os2.h> | ||
LONG thunkpr(LONG *p); /* prototype definition. */ | LONG thunkpr(LONG *p); /* prototype definition. */ | ||
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/* 16-bit to 32-bit pointer conversion procedure. */ | /* 16-bit to 32-bit pointer conversion procedure. */ | ||
} | } | ||
</pre> | </pre> | ||
Definition | Definition | ||
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* [[WinQueryWindowThunkProc]] | * [[WinQueryWindowThunkProc]] | ||
* [[WinSetWindowThunkProc]] | * [[WinSetWindowThunkProc]] | ||
[[Category:Win]] | [[Category:Win]] | ||
Latest revision as of 20:42, 27 November 2023
This function associates a pointer-conversion procedure with a window class.
Syntax
WinSetClassThunkProc(pszClassName, pfnThunkProc)
Parameters
- pszClassName (PSZ) - input
- Window-class name.
- pfnThunkProc (PFN) - input
- Pointer-conversion procedure identifier.
- NULL
- Any existing pointer-conversion procedure is dissociated from this class.
- By default, a class has no pointer-conversion procedure associated with it.
- Other
- The pointer-conversion procedure to be associated with this class.
Returns
- rc (BOOL) - returns
- Success indicator.
- TRUE
- Successful completion
- FALSE
- An error occurred.
Remarks
This function does not alter the pointer-conversion procedure associated with any existing window. It changes the pointer-conversion procedure that will be associated with a window created with a subsequent WinCreateWindow or WinCreateStdWindow function.
Example Code
This example sets the pointer conversion procedure of the window class, given that we have an anchor-block handle.
#define INCL_WINWINDOWMGR
#define INCL_WINTHUNKAPI
#include <os2.h>
LONG thunkpr(LONG *p); /* prototype definition. */
main()
{
HAB hab;
PFN pfn;
char *classname;
WinQueryClassName(hab,
sizeof(classname),
classname);
WinSetClassThunkProc(classname,
(PFN)thunkpr);
}
LONG thunkpr(LONG *p)
{
/* 16-bit to 32-bit pointer conversion procedure. */
}
Definition
#define INCL_WINTHUNKAPI /* Or use INCL_WIN, INCL_PM, */ #include <os2.h> PSZ pszClassName; /* Window-class name. */ PFN pfnThunkProc; /* Pointer-conversion procedure identifier. */ BOOL rc; /* Success indicator. */ rc = WinSetClassThunkProc(pszClassName, pfnThunkProc);