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[BUG/PRB.] VFP 9.0 FIX - THE FILETOSTR() FUNCTION USES THE WINDOWS SYSTEM CACHE
January 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), somtimes the FILETOSTR() function runs failed on Windows Vista or later.
2. CAUSE:
There are some compatible problems when the FILETOSTR() function calls the CreateFileA Windows API
for the Windows Defender program or the antivirus programs.
Now if the FILETOSTR() function calls the CreateFileA Windows API failed,
it will call the CreateFileA Windows API 3 times again.
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label488d4b ::
push ebp ;0x00488d4b : 55
lea ebp , dword ptr [ esp + 0FFFFFDBCh ] ;0x00488d4c : 8dac24bcfdffff
sub esp , 02C4h ;0x00488d53 : 81ecc4020000
mov eax , dword ptr [ Data937090 ] ;0x00488d59 : a190709300
push ebx ;0x00488d5e : 53
push esi ;0x00488d5f : 56
push edi ;0x00488d60 : 57
mov dword ptr [ ebp + 0240h ] , eax ;0x00488d61 : 898540020000
call Fun420d8c ;0x00488d67 : e82080f9ff
mov esi , eax ;0x00488d6c : 8bf0
mov dword ptr [ ebp + 40 ] , esi ;0x00488d6e : 897528
call Fun42371d ;0x00488d71 : e8a7a9f9ff
cmp dword ptr [ Data936f1c ] , 01h ;0x00488d76 : 833d1c6f930001
jne Label488e91 ;0x00488d7d : 0f850e010000
cmp byte ptr [esi] , 048h ;0x00488d83 : 803e48
jne Label488e91 ;0x00488d86 : 0f8505010000
mov edx , esi ;0x00488d8c : 8bd6
lea ebx , dword ptr [ ebp + 52 ] ;0x00488d8e : 8d5d34
call Fun52b398 ;0x00488d91 : e802260a00
xor ebx , ebx ;0x00488d96 : 33db
push ebx ;0x00488d98 : 53
pushd offset Data93a8c0 ;0x00488d99 : 68c0a89300
pushd offset Data91aed0 ;0x00488d9e : 68d0ae9100
pushd 0104h ;0x00488da3 : 6804010000
lea eax , dword ptr [ ebp + 52 ] ;0x00488da8 : 8d4534
push eax ;0x00488dab : 50
call Fun437e2a ;0x00488dac : e879f0faff
push eax ;0x00488db1 : 50
lea edx , dword ptr [ ebp + 52 ] ;0x00488db2 : 8d5534
lea ecx , dword ptr [ ebp + 0138h ] ;0x00488db5 : 8d8d38010000
call Fun42cc34 ;0x00488dbb : e8743efaff
lea edx , dword ptr [ ebp + 32 ] ;0x00488dc0 : 8d5520
lea eax , dword ptr [ ebp - 128 ] ;0x00488dc3 : 8d4580
call Fun42c27f ;0x00488dc6 : e8b434faff
push ebx ;0x00488dcb : 53
push eax ;0x00488dcc : 50
call Fun42c2be ;0x00488dcd : e8ec34faff
mov esi , eax ;0x00488dd2 : 8bf0
cmp esi , ebx ;0x00488dd4 : 3bf3
pop ecx ;0x00488dd6 : 59
pop ecx ;0x00488dd7 : 59
jne Label488deb ;0x00488dd8 : 7511
;
; ------------------------------------------------------------------------------
; VFP 9.0 FIX - THE FILETOSTR() FUNCTION USES THE WINDOWS SYSTEM CACHE
; February 2019
; ------------------------------------------------------------------------------
; CCB
;
; The FILETOSTR() function uses the Windows system cache.
;
; 2019/2/28, by ccb
;
; mov dword ptr vfpa_filetostr_isfiletostr,01h
pushd 021h ;0x00488dda : 6a21
pop edx ;0x00488ddc : 5a
lea ecx , dword ptr [ ebp + 0138h ] ;0x00488ddd : 8d8d38010000
call Fun42ce21 ;0x00488de3 : e83940faff
;
; ------------------------------------------------------------------------------
; VFP 9.0 FIX - THE FILETOSTR() FUNCTION USES THE WINDOWS SYSTEM CACHE
; February 2019
; ------------------------------------------------------------------------------
; CCB
;
; The FILETOSTR() function uses the Windows system cache.
;
; 2019/2/28, by ccb
;
Label488de7 ::
; mov dword ptr vfpa_filetostr_isfiletostr,00h
Label488de8 ::
mov dword ptr [ ebp + 48 ] , eax ;0x00488de8 : 894530
Label488deb ::
lea eax , dword ptr [ ebp + 32 ] ;0x00488deb : 8d4520
push eax ;0x00488dee : 50
lea eax , dword ptr [ ebp - 128 ] ;0x00488def : 8d4580
call Fun42d200 ;0x00488df2 : e80944faff
mov edi , dword ptr [ ebp + 48 ] ;0x00488df7 : 8b7d30
cmp edi , 0FFFFFFFFh ;0x00488dfa : 83ffff
je Label60c6f7 ;0x00488dfd : 0f84f4381800
cmp esi , ebx ;0x00488e03 : 3bf3
jne Label488e96 ;0x00488e05 : 0f858b000000
call Fun433ef7 ;0x00488e0b : e8e7b0faff
mov esi , dword ptr [ ebp + 40 ] ;0x00488e10 : 8b7528
mov dword ptr [ ebp + 44 ] , eax ;0x00488e13 : 89452c
call Fun420d46 ;0x00488e16 : e82b7ff9ff
test eax , eax ;0x00488e1b : 85c0
je Label60c70c ;0x00488e1d : 0f84e9381800
lea edx , dword ptr [ ebp + 36 ] ;0x00488e23 : 8d5524
lea eax , dword ptr [ ebp - 48 ] ;0x00488e26 : 8d45d0
call Fun42c27f ;0x00488e29 : e85134faff
push ebx ;0x00488e2e : 53
push eax ;0x00488e2f : 50
call Fun42c2be ;0x00488e30 : e88934faff
mov edi , dword ptr [ ebp + 40 ] ;0x00488e35 : 8b7d28
mov ebx , eax ;0x00488e38 : 8bd8
test ebx , ebx ;0x00488e3a : 85db
pop ecx ;0x00488e3c : 59
pop ecx ;0x00488e3d : 59
jne Label488e52 ;0x00488e3e : 7512
push dword ptr [ ebp + 44 ] ;0x00488e40 : ff752c
mov eax , dword ptr [ edi + 32 ] ;0x00488e43 : 8b4720
push dword ptr [eax] ;0x00488e46 : ff30
mov eax , dword ptr [ ebp + 48 ] ;0x00488e48 : 8b4530
xor esi , esi ;0x00488e4b : 33f6
call Fun4348d8 ;0x00488e4d : e886bafaff
Label488e52 ::
lea eax , dword ptr [ ebp + 36 ] ;0x00488e52 : 8d4524
push eax ;0x00488e55 : 50
lea eax , dword ptr [ ebp - 48 ] ;0x00488e56 : 8d45d0
call Fun42d200 ;0x00488e59 : e8a243faff
mov ecx , dword ptr [ ebp + 48 ] ;0x00488e5e : 8b4d30
call Fun42ddf2 ;0x00488e61 : e88c4ffaff
test ebx , ebx ;0x00488e66 : 85db
jne Label60c71d ;0x00488e68 : 0f85af381800
mov eax , dword ptr [ ebp + 44 ] ;0x00488e6e : 8b452c
mov dword ptr [ edi + 8 ] , eax ;0x00488e71 : 894708
mov byte ptr [edi] , 048h ;0x00488e74 : c60748
and dword ptr [ edi + 4 ] , 00h ;0x00488e77 : 83670400
Label488e7b ::
mov ecx , dword ptr [ ebp + 0240h ] ;0x00488e7b : 8b8d40020000
call Fun42bf1d ;0x00488e81 : e89730faff
pop edi ;0x00488e86 : 5f
pop esi ;0x00488e87 : 5e
pop ebx ;0x00488e88 : 5b
add ebp , 0244h ;0x00488e89 : 81c544020000
leave ;0x00488e8f : c9
ret ;0x00488e90 : 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_vfp9fix65.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_vfp9fix348.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix349.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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