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92 lines
2.9 KiB
92 lines
2.9 KiB
;**************************************************************************
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;* CLASS2.ASM
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;*
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;* Assembly support for the class enumeration routines.
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;*
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;**************************************************************************
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INCLUDE TOOLPRIV.INC
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PMODE32 = 0
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PMODE = 0
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SWAPPRO = 0
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INCLUDE TDB.INC
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;** Class structure
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CLS STRUC
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cls_pclsNext DW ?
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cls_clsMagic DW ?
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cls_atom DW ?
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cls_pdce DW ?
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cls_RefCount DW ?
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cls_style DW ?
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cls_lpfnWndProc DD ?
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cls_cbclsExtra DW ?
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cls_cbwndExtra DW ?
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cls_hInstance DW ?
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cls_hIcon DW ?
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cls_hCursor DW ?
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cls_hbrBackgr DW ?
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cls_lpszMnName DW ?
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cls_lpszClsName DW ?
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CLS ENDS
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;** External functions
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externNP HelperVerifySeg
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externFP GetAtomName
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;** Functions
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sBegin CODE
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assumes CS,CODE
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; ClassInfo
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;
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; Returns information about the class with the given block handle
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cProc ClassInfo, <PUBLIC,NEAR>, <si,di,ds>
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parmD lpClass
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parmW wOffset
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cBegin
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;** Start by verifying that we can read the segment here
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mov ax,hUserHeap ;Get the selector
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mov bx,wOffset ; and the desired offset
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cCall HelperVerifySeg, <ax,bx>
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or ax,ax ;FALSE return?
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jnz CI_SelOk ;We're OK
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xor ax,ax ;Return FALSE
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jmp CI_End
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CI_SelOk:
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;** Point to the CLS structure with DS:SI. Note that using DS to
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;** point to USER's DS is useful to get USER's local atoms
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mov ax,hUserHeap ;User's heap is User's DGROUP
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mov ds,ax
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mov si,wOffset ;Get a pointer to the CLS structure
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;** Copy the hInstance
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les di,lpClass ;Get the structure
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mov ax,[si].cls_hInstance ;Get the hInst of the class owner
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mov es:[di].ce_hInst,ax ;Save in the CLASSENTRY struct
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;** Get the string from the atom and copy the next pointer
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mov ax,[si].cls_atom ;Get the desired atom number
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lea bx,[di].ce_szClassName ;Get the offset to copy string to
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push es ;Save ES (GetAtomName may trash)
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mov cx,MAX_CLASSNAME ;Get max classname length
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cCall GetAtomName, <ax,es,bx,cx> ;Copy the atom string
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pop es
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or ax,ax ;OK?
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jnz CI_20 ;Yes
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mov es:[di].ce_szClassName,0 ;No. Clear the string
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CI_20: mov ax,[si].cls_pclsNext ;Get the next pointer
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mov es:[di].ce_wNext,ax ;Save it
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;** Return TRUE on success
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mov ax,TRUE
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CI_End:
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cEnd
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sEnd
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END
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