112 lines
3.1 KiB
NASM
112 lines
3.1 KiB
NASM
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; give2gdi.asm
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;
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; Copyright (C) 1991, MicroSoft Corporation
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;
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; Contains code which changes memory metafile ownership to GDI
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;
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; History: sriniK 05/22/1991
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;/
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include cmacros.inc
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include windows.inc
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.286
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;**************************** Data Segment ********************************
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sBegin data
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assumes ds, data
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szGDI db 'GDI', 0
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szWEP db 'WEP', 0
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sEnd data
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;*************************** Code Segment *********************************
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externFP GlobalRealloc
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externFP GlobalSize
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externFP GetModuleHandle
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externFP GetProcAddress
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createSeg Give2GDI, Give2GDI, para, public, code
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sBegin Give2GDI
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assumes cs,Give2GDI
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assumes ds,data
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assumes es,nothing
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;**************************** Public Functions ****************************
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cProc GiveToGDI, <PUBLIC,FAR>
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;
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;
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; HANDLE FAR PASCAL GiveToGDI(HANDLE hMem)
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;
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; Assign ownership of the given global memory block to GDI
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;
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; returns a handle to the memory block if successful, otherwise returns NULL
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;
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parmW hMem
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localD lpGDIWEP
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cBegin
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;*************************************************************
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;** Get address of retf in fixed GDI code segment **
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;*************************************************************
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push ds
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push dataOFFSET szGDI
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cCall GetModuleHandle
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push ax
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push ds
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push dataOFFSET szWEP
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cCall GetProcAddress
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mov [word ptr lpGDIWEP[0]], ax
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mov [word ptr lpGDIWEP[2]], dx
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;*************************************************************
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;** Kludge a call to GlobalReAlloc with GDI as caller **
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;*************************************************************
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push 0 ; Params for WEP
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push cs ; GDI's WEP returns here
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push offset ReturnHere
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push hMem ; Params to GlobalReAlloc
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push 0
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push 0
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push [GMEM_MOVEABLE or GMEM_SHARE or GMEM_MODIFY]
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push [word ptr lpGDIWEP[2]] ; GlobalReAlloc returns here
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push [word ptr lpGDIWEP[0]] ; GlobalReAlloc returns here
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push 0 ; Params for WEP
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push seg GlobalReAlloc ; GDI's WEP returns here
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push offset GlobalReAlloc
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jmp lpGDIWEP ; Dive off the end
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ReturnHere:
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;*************************************************************
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;** Return handle to reallocated block **
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;*************************************************************
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mov ax,hMem
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cEnd
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;*************************************************************************
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sEnd Give2GDI
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end
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;*************************************************************************
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