-------------------------------------------------------------------------------------------------
[BUG/PRB.] VFP 9.0 FIX - READ DATA FROM THE FILE IN AN EXECUTABLE FILE WHEN END-OF-FILE
January 2024
-------------------------------------------------------------------------------------------------
CCB
1. BUG:
In vfp6, vfp7, vfp8, VFP 9.0.0.2412 and VFP 9.0.0.3504 (SP1), vfp will read data from the file in an executable file when end-of-file.
In VFP 9.0.0.4611 (SP2) and later, vfp will not read data from the file in an executable file when end-of-file.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label43e445 ::
mov eax , dword ptr [ ebx + 48 ] ;0x0043e445 : 8b4330
test eax , eax ;0x0043e448 : 85c0
je Label42d17e ;0x0043e44a : 0f842eedfeff
;
; --------------------------------------------------------------------------------------
; VFP 9.0 FIX - READ DATA FROM THE FILE IN AN EXECUTABLE FILE WHEN END-OF-FILE
; August 2019
; --------------------------------------------------------------------------------------
; CCB
;
; Read data from the file in an executable file when end-of-file.
;
; 2019/8/21, by ccb
;
cmp dword ptr vfpa_sys9024_data,00h
jne Label42d17e
mov ecx , dword ptr [ ebx + 4 ] ;0x0043e450 : 8b4b04
mov eax , dword ptr [ebx] ;0x0043e453 : 8b03
lea edx , dword ptr [ ecx + ebp ] ;0x0043e455 : 8d1429
cmp edx , eax ;0x0043e458 : 3bd0
jg Label56e42d ;0x0043e45a : 0f8fcdff1200
jmp Label42d17e ;0x0043e460 : e919edfeff
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)
The bug has been fixed in VFP Advanced.
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
http://www.baiyujia.com/vfpdocuments/f_vfp9fix89.asp
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
|