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[BUG/PRB.] VFP 9.0 FIX - THE NUMBER OF TIMES TO TRY AGAIN AFTER CREATE FILE FAILED
September 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), somtimes the FCREATE() function runs failed on Windows Vista or later.
2. CAUSE:
There are some compatible problems when the FCREATE() function calls the CreateFileA Windows API
for the Windows Defender program or the antivirus programs.
Now if the FCREATE() function calls the CreateFileA Windows API failed,
it will call the CreateFileA Windows API many times again.
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label449c4e ::
push ebp ;0x00449c4e : 55
lea ebp , dword ptr [ esp + 0FFFFFDBCh ] ;0x00449c4f : 8dac24bcfdffff
sub esp , 02C4h ;0x00449c56 : 81ecc4020000
mov eax , dword ptr [ Data937090 ] ;0x00449c5c : a190709300
push ebx ;0x00449c61 : 53
push esi ;0x00449c62 : 56
xor ebx , ebx ;0x00449c63 : 33db
push edi ;0x00449c65 : 57
mov dword ptr [ ebp + 0240h ] , eax ;0x00449c66 : 898540020000
mov word ptr [ Data93bc88 ] , bx ;0x00449c6c : 66891d88bc9300
call Fun420d8c ;0x00449c73 : e81471fdff
cmp dword ptr [ Data936f1c ] , 01h ;0x00449c78 : 833d1c6f930001
mov dword ptr [ ebp + 48 ] , eax ;0x00449c7f : 894530
mov edi , 0100h ;0x00449c82 : bf00010000
jg Label60c554 ;0x00449c87 : 0f8fc7281c00
mov byte ptr [ ebp + 55 ] , bl ;0x00449c8d : 885d37
Label449c90 ::
mov eax , dword ptr [ ebp + 48 ] ;0x00449c90 : 8b4530
call Fun42371d ;0x00449c93 : e8859afdff
mov edx , dword ptr [ ebp + 48 ] ;0x00449c98 : 8b5530
lea ebx , dword ptr [ ebp + 0140h ] ;0x00449c9b : 8d9d40010000
call Fun52b398 ;0x00449ca1 : e8f2160e00
xor ebx , ebx ;0x00449ca6 : 33db
push ebx ;0x00449ca8 : 53
push ebx ;0x00449ca9 : 53
pushd offset Data91aed0 ;0x00449caa : 68d0ae9100
push edi ;0x00449caf : 57
lea eax , dword ptr [ ebp + 0140h ] ;0x00449cb0 : 8d8540010000
push eax ;0x00449cb6 : 50
call Fun437e2a ;0x00449cb7 : e86ee1feff
push eax ;0x00449cbc : 50
lea edx , dword ptr [ ebp + 0140h ] ;0x00449cbd : 8d9540010000
lea ecx , dword ptr [ ebp + 56 ] ;0x00449cc3 : 8d4d38
call Fun42cc34 ;0x00449cc6 : e8692ffeff
push ebx ;0x00449ccb : 53
lea eax , dword ptr [ ebp + 56 ] ;0x00449ccc : 8d4538
call Fun42d5e0 ;0x00449ccf : e80c39feff
test eax , eax ;0x00449cd4 : 85c0
jne Label60c66e ;0x00449cd6 : 0f8592291c00
push ebx ;0x00449cdc : 53
lea eax , dword ptr [ ebp + 56 ] ;0x00449cdd : 8d4538
push eax ;0x00449ce0 : 50
call Fun42c9be ;0x00449ce1 : e8d82cfeff
test eax , eax ;0x00449ce6 : 85c0
jne Label60c60d ;0x00449ce8 : 0f851f291c00
Label449cee ::
lea edx , dword ptr [ ebp + 36 ] ;0x00449cee : 8d5524
lea eax , dword ptr [ ebp - 128 ] ;0x00449cf1 : 8d4580
call Fun42c27f ;0x00449cf4 : e88625feff
push ebx ;0x00449cf9 : 53
push eax ;0x00449cfa : 50
call Fun42c2be ;0x00449cfb : e8be25feff
cmp eax , ebx ;0x00449d00 : 3bc3
pop ecx ;0x00449d02 : 59
pop ecx ;0x00449d03 : 59
mov dword ptr [ ebp + 40 ] , eax ;0x00449d04 : 894528
jne Label449d1f ;0x00449d07 : 7516
xor edx , edx ;0x00449d09 : 33d2
cmp byte ptr [ ebp + 55 ] , bl ;0x00449d0b : 385d37
;
; ---------------------------------------------------------------------------------
; VFP 9.0 FIX - THE NUMBER OF TIMES TO TRY AGAIN AFTER CREATE FILE FAILED
; September 2024
; ---------------------------------------------------------------------------------
; CCB
;
; The number of times to try again after create file (FCREATE() function) failed.
;
; 2024/9/19, by ccb
;
; mov dword ptr vfpa_createfile_iscreatefile,01h
lea ecx , dword ptr [ ebp + 56 ] ;0x00449d0e : 8d4d38
setne dl ;0x00449d11 : 0f95c2
or edx , 02Ch ;0x00449d14 : 83ca2c
call Fun42ce21 ;0x00449d17 : e80531feff
;
; ---------------------------------------------------------------------------------
; VFP 9.0 FIX - THE NUMBER OF TIMES TO TRY AGAIN AFTER CREATE FILE FAILED
; September 2024
; ---------------------------------------------------------------------------------
; CCB
;
; The number of times to try again after create file (FCREATE() function) failed.
;
; 2024/9/19, by ccb
;
Label449d1b ::
; mov dword ptr vfpa_createfile_iscreatefile,00h
Label449d1c ::
mov dword ptr [ ebp + 44 ] , eax ;0x00449d1c : 89452c
Label449d1f ::
lea eax , dword ptr [ ebp + 36 ] ;0x00449d1f : 8d4524
push eax ;0x00449d22 : 50
lea eax , dword ptr [ ebp - 128 ] ;0x00449d23 : 8d4580
call Fun42d200 ;0x00449d26 : e8d534feff
cmp dword ptr [ ebp + 40 ] , ebx ;0x00449d2b : 395d28
jne Label60c61e ;0x00449d2e : 0f85ea281c00
cmp byte ptr [ ebp + 55 ] , bl ;0x00449d34 : 385d37
jne Label60c65a ;0x00449d37 : 0f851d291c00
Label449d3d ::
mov eax , dword ptr [ ebp + 48 ] ;0x00449d3d : 8b4530
mov ecx , dword ptr [ ebp + 44 ] ;0x00449d40 : 8b4d2c
mov dword ptr [ eax + 12 ] , ecx ;0x00449d43 : 89480c
mov byte ptr [eax] , 049h ;0x00449d46 : c60049
mov dword ptr [ eax + 4 ] , 0Ah ;0x00449d49 : c740040a000000
Label449d50 ::
mov ecx , dword ptr [ ebp + 0240h ] ;0x00449d50 : 8b8d40020000
call Fun42bf1d ;0x00449d56 : e8c221feff
pop edi ;0x00449d5b : 5f
pop esi ;0x00449d5c : 5e
pop ebx ;0x00449d5d : 5b
add ebp , 0244h ;0x00449d5e : 81c544020000
leave ;0x00449d64 : c9
ret ;0x00449d65 : c3
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_vfp9fix348.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix65.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix66.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix67.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix68.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix69.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix70.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix71.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix72.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix73.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix74.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix84.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix85.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix107.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix108.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix109.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix110.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix143.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix144.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix145.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix146.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix147.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix148.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix149.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix150.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix203.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix261.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix262.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix269.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix270.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix278.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix279.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix350.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix351.asp
2, microsoft.com:
https://devblogs.microsoft.com/oldnewthing/20120907-00/?p=6663
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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