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[BUG/PRB.] VFP 9.0 FIX - VARBINARY OR BLOB DATA
January 2024
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CCB
1. BUG:
In vfp9, we can use some new data type such as Varbinary Data, Blob Data,
but when SET("STATUS BAR")="OFF" and SET("TALK")="ON", VFP will enter an infinite loop.
There is a program for test:
*PROC testvarbinary
SET STEP OFF
SET ECHO OFF
SET DEBUG OFF
SET ESCAPE OFF
SET TALK OFF
SET SAFETY OFF
_SCREEN.VISIBLE=.T.
_SCREEN.WINDOWSTATE=2
SET STATUS BAR OFF
SET TALK ON
x1=0h11223344
WAIT
RETURN
* END OF PROC TESTVARBINARY.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label8765a8 ::
pushd 0Ah ;0x008765a8 : 6a0a
call Fun6d99d2 ;0x008765aa : e82334e6ff
Label8765af ::
;
; -------------------------------------------------
; VFP 9.0 FIX - VARBINARY OR BLOB DATA
; June 2014
; -------------------------------------------------
; CCB
;
; Store Varbinary or Blob data to a variable when SET("STATUS BAR")="OFF" and SET("TALK")="ON", VFP will enter an infinite loop.
;
; 2014/6/29, by ccb
;
cmp dword ptr [esi],48h ; H
je VFP9FixVarbinary_Varbinary
cmp dword ptr [esi],51h ; Q
je VFP9FixVarbinary_Varbinary
jmp VFP9FixVarbinary_Other
VFP9FixVarbinary_Varbinary:
cmp dword ptr [esi+4],1
jne VFP9FixVarbinary_Other
cmp dword ptr [esi+8],07Eh
jbe VFP9FixVarbinary_Label87658b
mov dword ptr [esi+8],07Eh
VFP9FixVarbinary_Label87658b :
mov ecx , dword ptr [ esi + 8 ] ;0x0087658b : 8b88f4000000
mov eax , 07Eh ;0x00876591 : b800010000
cmp ecx , eax ;0x00876596 : 3bc8
mov dword ptr [ ebp + 0FFFFFF78h ] , ecx ;0x00876598 : 898d78ffffff
jl VFP9FixVarbinary_Label8765af ;0x0087659e : 7c0f
mov dword ptr [ ebp + 0FFFFFF78h ] , eax ;0x008765a0 : 898578ffffff
jmp VFP9FixVarbinary_Label8765af ;0x008765a6 : eb07
VFP9FixVarbinary_Label8765af :
push dword ptr [ ebp + 0FFFFFF78h ] ;0x008765af : ffb578ffffff
lea eax , dword ptr [ ebp + 0FFFFFF7Ch ] ;0x008765b5 : 8d857cffffff
push eax ;0x008765bb : 50
push esi ;0x008765bc : 56
call Fun876638 ;0x008765bd : e876000000
VFP9FixVarbinary_Label5cba13 ::
mov eax , dword ptr [ ebp + 0FFFFFF78h ] ;0x005cba13 : 8b4308
cmp eax , 07Eh ;0x005cba16 : 83f87e
mov byte ptr [ ebp + 0FFFFFF7Ch ] , 030h ;0x005cba19 : c6857cffffff30
mov byte ptr [ ebp + 0FFFFFF7Dh ] , 068h ;0x005cba20 : c6857dffffff68
jbe VFP9FixVarbinary_Label5cba2c ;0x005cba27 : 7603
pushd 07Eh ;0x005cba29 : 6a7e
pop eax ;0x005cba2b : 58
VFP9FixVarbinary_Label5cba2c ::
lea ecx , dword ptr [ ebp + 0FFFFFF7Eh ] ;0x005cba2c : 8d8d7effffff
push ecx ;0x005cba32 : 51
mov ecx , dword ptr [ esi + 32 ] ;0x005cba33 : 8b4b20
mov ecx , dword ptr [ecx] ;0x005cba36 : 8b09
call Fun78244e ;0x005cba38 : e8116a1b00
add eax,2
mov dword ptr [esi+8],0
jmp VFP9FixVarbinary_end
VFP9FixVarbinary_Other:
push dword ptr [ ebp + 0FFFFFF78h ] ;0x008765af : ffb578ffffff
lea eax , dword ptr [ ebp + 0FFFFFF7Ch ] ;0x008765b5 : 8d857cffffff
push eax ;0x008765bb : 50
push esi ;0x008765bc : 56
call Fun876638 ;0x008765bd : e876000000
VFP9FixVarbinary_end:
pushd 00h ;0x008765c2 : 6a00
lea ebx , dword ptr [ ebp + 0FFFFFF7Ch ] ;0x008765c4 : 8d9d7cffffff
mov edi , eax ;0x008765ca : 8bf8
pushd 00h ;0x008765cc : 6a00
call Fun49df89 ;0x008765ce : e8b679c2ff
mov ecx , esi ;0x008765d3 : 8bce
call Fun540791 ;0x008765d5 : e8b7a1ccff
;
; -------------------------------------------------
; VFP 9.0 FIX - VARBINARY OR BLOB DATA
; June 2014
; -------------------------------------------------
; CCB
;
; Store Varbinary or Blob data to a variable when SET("STATUS BAR")="OFF" and SET("TALK")="ON", VFP will enter an infinite loop.
;
; 2014/6/29, by ccb
;
cmp dword ptr [esi],48h ; H
je VFP9FixVarbinary2_Varbinary
cmp dword ptr [esi],51h ; Q
je VFP9FixVarbinary2_Varbinary
jmp VFP9FixVarbinary2_end
VFP9FixVarbinary2_Varbinary:
cmp dword ptr [esi+4],1
jne VFP9FixVarbinary2_end
cmp dword ptr [esi+8],0
jne VFP9FixVarbinary2_end
xor eax,eax
VFP9FixVarbinary2_end:
test eax , eax ;0x008765da : 85c0
jne Label8765a8 ;0x008765dc : 75ca
jmp Label8765e8 ;0x008765de : eb08
4. APPLIES TO:
VFP 9.0.0.2412
VFP 9.0.0.3504 (SP1)
VFP 9.0.0.4611 (SP2)
VFP 9.0.0.5015 (SP2)
VFP 9.0.0.5411 (SP2)
VFP 9.0.0.5721 (SP2)
VFP 9.0.0.5815 (SP2)
VFP 9.0.0.6303 (SP2)
VFP 9.0.0.6602 (SP2)
VFP 9.0.0.7423 (SP2)
The bug has been fixed in VFP Advanced.
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
2, microsoft.com:
http://connect.microsoft.com/VisualStudio/feedback/details/458727/visual-foxpro-9-0-locks-up-when-assigning-varbinary-variables
3, foxite.com:
http://www.foxite.com/archives/foxcharts-hang-up-0000228718.htm
4, codeplex.com:
http://vfpx.codeplex.com/discussions/56847
5, foxclub.ru:
http://forum.foxclub.ru/read.php?29,389161
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
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