--------------------------------------------------------------------------------
[BUG/PRB.] VFP 9.0 FIX - FIX THE COLUMN.DYNAMICCURRENTCONTROL PROPERTY
January 2024
--------------------------------------------------------------------------------
CCB
1. BUG:
In vfp9, if ALLTRIM(EVALUATE(Column.DynamicCurrentControl))=="", sometimes vfp will crash.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Fun676706 :: ; proc near
push ebp ;0x00676706 : 55
mov ebp , esp ;0x00676707 : 8bec
sub esp , 01Ch ;0x00676709 : 83ec1c
test byte ptr [ ebx + 92 ] , 040h ;0x0067670c : f6435c40
push esi ;0x00676710 : 56
push edi ;0x00676711 : 57
je Label676738 ;0x00676712 : 7424
mov eax , dword ptr [ ebx + 0320h ] ;0x00676714 : 8b8320030000
mov eax , dword ptr [eax] ;0x0067671a : 8b00
mov ecx , dword ptr [ eax + 0B0h ] ;0x0067671c : 8b88b0000000
mov eax , dword ptr [ eax + 0B4h ] ;0x00676722 : 8b80b4000000
and dword ptr [ ebp - 24 ] , 00h ;0x00676728 : 8365e800
and dword ptr [ ebp - 20 ] , 00h ;0x0067672c : 8365ec00
mov dword ptr [ ebp - 16 ] , ecx ;0x00676730 : 894df0
mov dword ptr [ ebp - 12 ] , eax ;0x00676733 : 8945f4
jmp Label676742 ;0x00676736 : eb0a
Label676738 ::
lea esi , dword ptr [ ebx + 40 ] ;0x00676738 : 8d7328
lea edi , dword ptr [ ebp - 24 ] ;0x0067673b : 8d7de8
movsd ;0x0067673e : a5
movsd ;0x0067673f : a5
movsd ;0x00676740 : a5
movsd ;0x00676741 : a5
Label676742 ::
mov ecx , dword ptr [ ebx + 12 ] ;0x00676742 : 8b4b0c
test ecx , ecx ;0x00676745 : 85c9
je Label676751 ;0x00676747 : 7408
call Fun41ebcf ;0x00676749 : e88184daff
mov dword ptr [ ebp - 8 ] , eax ;0x0067674e : 8945f8
Label676751 ::
test byte ptr [ ebx + 88 ] , 01h ;0x00676751 : f6435801
je Label6767f0 ;0x00676755 : 0f8495000000
mov eax , dword ptr [ ebx + 090h ] ;0x0067675b : 8b8390000000
imul eax , eax , 0158h ;0x00676761 : 69c058010000
cmp dword ptr [ eax + ebx + 0868h ] , 00h ;0x00676767 : 83bc186808000000
je Label6767f0 ;0x0067676f : 747f
test byte ptr [ ebx + 98 ] , 080h ;0x00676771 : f6436280
je Label676789 ;0x00676775 : 7412
lea edx , dword ptr [ ebx + 066Ch ] ;0x00676777 : 8d936c060000
lea esi , dword ptr [ ebp - 24 ] ;0x0067677d : 8d75e8
call Fun4589b2 ;0x00676780 : e82d22deff
test eax , eax ;0x00676785 : 85c0
je Label6767f0 ;0x00676787 : 7467
Label676789 ::
mov eax , ebx ;0x00676789 : 8bc3
call Fun67ab3b ;0x0067678b : e8ab430000
mov eax , dword ptr [ ebx + 090h ] ;0x00676790 : 8b8390000000
imul eax , eax , 0158h ;0x00676796 : 69c058010000
mov eax , dword ptr [ eax + ebx + 0868h ] ;0x0067679c : 8b841868080000
;
; ---------------------------------------------------------------------
; VFP 9.0 FIX - FIX THE COLUMN.DYNAMICCURRENTCONTROL PROPERTY
; March 2023
; ---------------------------------------------------------------------
; CCB
;
; In vfp9, if ALLTRIM(EVALUATE(Column.DynamicCurrentControl))=="", sometimes vfp will crash.
;
; 2023/3/17, by ccb
;
test eax , eax
je Label6767f0
call Fun50d098 ;0x006767a3 : e8f068e9ff
test eax , eax ;0x006767a8 : 85c0
je Label6767d0 ;0x006767aa : 7424
mov eax , dword ptr [ ebx + 090h ] ;0x006767ac : 8b8390000000
push dword ptr [ ebp + 8 ] ;0x006767b2 : ff7508
imul eax , eax , 0158h ;0x006767b5 : 69c058010000
mov edx , dword ptr [ eax + ebx + 0868h ] ;0x006767bb : 8b941868080000
pushd 0362h ;0x006767c2 : 6862030000
call Fun8c4620 ;0x006767c7 : e854de2400
pop ecx ;0x006767cc : 59
pop ecx ;0x006767cd : 59
jmp Label6767f0 ;0x006767ce : eb20
Label6767d0 ::
mov edx , dword ptr [ ebx + 090h ] ;0x006767d0 : 8b9390000000
mov eax , dword ptr [ ebp + 8 ] ;0x006767d6 : 8b4508
imul edx , edx , 0158h ;0x006767d9 : 69d258010000
mov edx , dword ptr [ edx + ebx + 0868h ] ;0x006767df : 8b941a68080000
mov ecx , 0362h ;0x006767e6 : b962030000
call Fun4f6226 ;0x006767eb : e836fae7ff
Label6767f0 ::
test byte ptr [ ebx + 93 ] , 02h ;0x006767f0 : f6435d02
jne Label6767fb ;0x006767f4 : 7505
call Fun4a2067 ;0x006767f6 : e86cb8e2ff
Label6767fb ::
cmp dword ptr [ ebx + 12 ] , 00h ;0x006767fb : 837b0c00
je Label676809 ;0x006767ff : 7408
mov ecx , dword ptr [ ebp - 8 ] ;0x00676801 : 8b4df8
call Fun41ebcf ;0x00676804 : e8c683daff
Label676809 ::
or byte ptr [ ebx + 89 ] , 040h ;0x00676809 : 804b5940
pushd 04h ;0x0067680d : 6a04
pop eax ;0x0067680f : 58
pop edi ;0x00676810 : 5f
pop esi ;0x00676811 : 5e
leave ;0x00676812 : c9
ret 04h ;0x00676813 : c20400
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
http://www.baiyujia.com/vfpdocuments/f_vfp9fix251.asp
2, foxite.com:
https://www.foxite.com/archives/fatal-error-set-date-american-0000493905.htm
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
|