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[ENHANCED] VFP 9.0 FIX - CATCH THE INTERNAL CONSISTENCY ERROR
January 2024
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CCB
1. BUG:
If we enable catching the internal consistency error in Visual FoxPro Advanced,
when Visual FoxPro causes the internal consistency error (Error 1000),
it will display a dialog box "Are you sure you want to exit Visual FoxPro?",
if we select "Yes", it will display the error dialog box "Internal consistency error",
and then it will display a dialog box "Do you want to save changes to ...?" if there are some unsaved files,
and then exit Visual FoxPro,
if we select "No", it will cause the error "There is not enough memory to complete this operation (Error 43)",
and then it will return to Visual FoxPro, now we can do some important work, and then exit Visual FoxPro.
It is the startup default for Visual FoxPro Advanced Interactive Development Environment (IDE).
Please refer to the picture testinternalconsistencyerror.png:
If we disable catching the internal consistency error in Visual FoxPro Advanced,
when Visual FoxPro causes the internal consistency error (Error 1000),
it will display the error dialog box "Internal consistency error",
and then it will display a dialog box "Do you want to save changes to ...?" if there are some unsaved files,
and then exit Visual FoxPro.
It is the startup default for Visual FoxPro Advanced Runtime and Visual FoxPro Advanced Multi-threaded Runtime.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Fun544742 :: ; proc near
push ebp ;0x00544742 : 55
mov eax , 012F4h ;0x00544743 : b8f4120000
lea ebp , dword ptr [ esp + 0FFFFEF0Ch ] ;0x00544748 : 8dac240cefffff
call Fun42c118 ;0x0054474f : e8c479eeff
mov eax , dword ptr [ Data937090 ] ;0x00544754 : a190709300
push ebx ;0x00544759 : 53
mov dword ptr [ ebp + 010F0h ] , eax ;0x0054475a : 8985f0100000
push esi ;0x00544760 : 56
mov eax , ecx ;0x00544761 : 8bc1
;
; ------------------------------------------------------------
; VFP 9.0 FIX - CATCH THE INTERNAL CONSISTENCY ERROR
; June 2022
; ------------------------------------------------------------
; CCB
;
; Catch the internal consistency error (Error 1000).
;
; 2022/6/13, by ccb
;
cmp dword ptr vfpa_sys9101_data,00h
je Label544763
cmp eax , 00h
jne Label544763
xor esi , esi
mov eax , dword ptr [ Data9370e8 ]
mov dl , byte ptr [ eax + 28 ]
mov cl , 08h
test cl , dl
jne Label544762
Label54475f ::
mov ecx , dword ptr [ Data937220 ]
cmp ecx , esi
je Label544761
cmp eax , dword ptr [ ecx + 72 ]
jne Label544761
cmp dword ptr vfpa_sys9101_data,02h
je Label544760
pushd 00h
pushd 02h
pushd 00h
pushd 00h
lea eax , byte ptr vfpa_sys9101_text
push eax
call Fun6da248
cmp eax , 02h
jne Label544761
Label544760 ::
mov ecx , 0B6h
mov eax , ecx
jmp Label544763
Label544761 ::
mov ecx , 00h
mov eax , ecx
jmp Label544763
Label544762 ::
mov dl , byte ptr [ eax - 28 ]
sub eax , 038h
test cl , dl
jne Label544762
jmp Label54475f
Label544763 ::
mov cx , word ptr [ Data937770 ] ;0x00544763 : 668b0d70779300
xor esi , esi ;0x0054476a : 33f6
cmp eax , 065h ;0x0054476c : 83f865
push edi ;0x0054476f : 57
mov dword ptr [ Data939800 ] , esi ;0x00544770 : 893500989300
je Label58ccb0 ;0x00544776 : 0f8434850400
Label54477c ::
cmp eax , 0ABh ;0x0054477c : 3dab000000
je Label58ccc1 ;0x00544781 : 0f843a850400
Label544787 ::
cmp eax , 063h ;0x00544787 : 83f863
mov ebx , eax ;0x0054478a : 8bd8
mov dword ptr [ ebp + 112 ] , ebx ;0x0054478c : 895d70
je Label58cce0 ;0x0054478f : 0f844b850400
Label544795 ::
mov eax , offset Data922b80 ;0x00544795 : b8802b9200
mov edi , edi ;0x0054479a : 8bff
Label54479c ::
movsx ecx ,word ptr [eax] ;0x0054479c : 0fbf08
cmp ecx , ebx ;0x0054479f : 3bcb
je Label5447b3 ;0x005447a1 : 7410
add eax , 0Ch ;0x005447a3 : 83c00c
cmp eax , offset Data925568 ;0x005447a6 : 3d68559200
jnb Label58cd01 ;0x005447ab : 0f8350850400
jmp Label54479c ;0x005447b1 : ebe9
Label5447b3 ::
cmp eax , esi ;0x005447b3 : 3bc6
je Label58cd08 ;0x005447b5 : 0f844d850400
movzx eax ,byte ptr [ eax + 2 ] ;0x005447bb : 0fb64002
mov ecx , eax ;0x005447bf : 8bc8
and ecx , 01h ;0x005447c1 : 83e101
and eax , 04h ;0x005447c4 : 83e004
mov edi , eax ;0x005447c7 : 8bf8
Label5447c9 ::
cmp ecx , esi ;0x005447c9 : 3bce
mov dword ptr [ ebp + 108 ] , edi ;0x005447cb : 897d6c
mov dword ptr [ ebp + 104 ] , ecx ;0x005447ce : 894d68
jne Label58cd20 ;0x005447d1 : 0f8549850400
mov eax , dword ptr [ Data9370e8 ] ;0x005447d7 : a1e8709300
mov dl , byte ptr [ eax + 28 ] ;0x005447dc : 8a501c
mov cl , 08h ;0x005447df : b108
test cl , dl ;0x005447e1 : 84d1
jne Label58cd11 ;0x005447e3 : 0f8528850400
Label5447e9 ::
mov ecx , dword ptr [ Data937220 ] ;0x005447e9 : 8b0d20729300
cmp ecx , esi ;0x005447ef : 3bce
je Label4cec47 ;0x005447f1 : 0f8450a4f8ff
cmp eax , dword ptr [ ecx + 72 ] ;0x005447f7 : 3b4148
jne Label4cec47 ;0x005447fa : 0f8547a4f8ff
push ebx ;0x00544800 : 53
call Fun543c69 ;0x00544801 : e863f4ffff
4. APPLIES TO:
VFP 6.0.8167.0
VFP 6.0.8961.0 (SP5)
VFP 7.0.0.9262
VFP 7.0.0.9465 (SP1)
VFP 8.0.0.2521
VFP 8.0.0.3117 (SP1)
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
http://www.baiyujia.com/vfpdocuments/f_vfp9fix214.asp
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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