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[BUG/PRB.] VFP 9.0 FIX - THE STRTOFILE() FUNCTION USES THE WINDOWS SYSTEM CACHE
January 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), somtimes the STRTOFILE() function runs failed on Windows Vista or later.
2. CAUSE:
There are some compatible problems when the STRTOFILE() function calls the CreateFileA Windows API
for the Windows Defender program or the antivirus programs.
Now if the STRTOFILE() 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.
Label52ba3f ::
push ebp ;0x0052ba3f : 55
lea ebp , dword ptr [ esp + 0FFFFFE08h ] ;0x0052ba40 : 8dac2408feffff
sub esp , 0278h ;0x0052ba47 : 81ec78020000
mov eax , dword ptr [ Data937090 ] ;0x0052ba4d : a190709300
or dword ptr [ ebp - 40 ] , 0FFFFFFFFh ;0x0052ba52 : 834dd8ff
and dword ptr [ ebp - 28 ] , 00h ;0x0052ba56 : 8365e400
push ebx ;0x0052ba5a : 53
push esi ;0x0052ba5b : 56
push edi ;0x0052ba5c : 57
mov dword ptr [ ebp + 01F4h ] , eax ;0x0052ba5d : 8985f4010000
mov dword ptr [ ebp - 36 ] , 08h ;0x0052ba63 : c745dc08000000
call Fun420d8c ;0x0052ba6a : e81d53efff
mov ebx , eax ;0x0052ba6f : 8bd8
mov dword ptr [ ebp - 44 ] , ebx ;0x0052ba71 : 895dd4
call Fun42371d ;0x0052ba74 : e8a47cefff
lea esi , dword ptr [ ebx + 44 ] ;0x0052ba79 : 8d732c
mov eax , esi ;0x0052ba7c : 8bc6
call Fun42371d ;0x0052ba7e : e89a7cefff
cmp byte ptr [ebx] , 048h ;0x0052ba83 : 803b48
jne Label60c6e8 ;0x0052ba86 : 0f855c0c0e00
cmp byte ptr [esi] , 048h ;0x0052ba8c : 803e48
jne Label60c6e8 ;0x0052ba8f : 0f85530c0e00
cmp dword ptr [ Data936f1c ] , 03h ;0x0052ba95 : 833d1c6f930003
jne Label52bac3 ;0x0052ba9c : 7525
lea edi , dword ptr [ ebx + 88 ] ;0x0052ba9e : 8d7b58
call Fun529a6e ;0x0052baa1 : e8c8dfffff
mov al , byte ptr [edi] ;0x0052baa6 : 8a07
cmp al , 049h ;0x0052baa8 : 3c49
je Label52bbc4 ;0x0052baaa : 0f8414010000
cmp al , 04Ch ;0x0052bab0 : 3c4c
jne Label60c6e8 ;0x0052bab2 : 0f85300c0e00
xor eax , eax ;0x0052bab8 : 33c0
cmp dword ptr [ ebx + 96 ] , eax ;0x0052baba : 394360
setne al ;0x0052babd : 0f95c0
mov dword ptr [ ebp - 28 ] , eax ;0x0052bac0 : 8945e4
Label52bac3 ::
mov edx , esi ;0x0052bac3 : 8bd6
lea ebx , dword ptr [ ebp - 24 ] ;0x0052bac5 : 8d5de8
call Fun52b398 ;0x0052bac8 : e8cbf8ffff
xor esi , esi ;0x0052bacd : 33f6
push esi ;0x0052bacf : 56
push esi ;0x0052bad0 : 56
pushd offset Data91aed0 ;0x0052bad1 : 68d0ae9100
pushd 0104h ;0x0052bad6 : 6804010000
mov eax , ebx ;0x0052badb : 8bc3
push eax ;0x0052badd : 50
call Fun437e2a ;0x0052bade : e847c3f0ff
push eax ;0x0052bae3 : 50
mov edx , ebx ;0x0052bae4 : 8bd3
lea ecx , dword ptr [ ebp + 0ECh ] ;0x0052bae6 : 8d8dec000000
call Fun42cc34 ;0x0052baec : e84311f0ff
lea edx , dword ptr [ ebp - 48 ] ;0x0052baf1 : 8d55d0
lea eax , dword ptr [ ebp - 128 ] ;0x0052baf4 : 8d4580
call Fun42c27f ;0x0052baf7 : e88307f0ff
push esi ;0x0052bafc : 56
push eax ;0x0052bafd : 50
call Fun42c2be ;0x0052bafe : e8bb07f0ff
mov ebx , eax ;0x0052bb03 : 8bd8
pop ecx ;0x0052bb05 : 59
cmp ebx , esi ;0x0052bb06 : 3bde
mov esi , dword ptr [ ebp - 44 ] ;0x0052bb08 : 8b75d4
pop ecx ;0x0052bb0b : 59
jne Label52bbd5 ;0x0052bb0c : 0f85c3000000
cmp dword ptr [ ebp - 28 ] , 01h ;0x0052bb12 : 837de401
lea eax , dword ptr [ ebp + 0ECh ] ;0x0052bb16 : 8d85ec000000
jne Label50b798 ;0x0052bb1c : 0f8576fcfdff
pushd 00h ;0x0052bb22 : 6a00
push eax ;0x0052bb24 : 50
call Fun42c9be ;0x0052bb25 : e8940ef0ff
test eax , eax ;0x0052bb2a : 85c0
je Label52bb32 ;0x0052bb2c : 7404
and dword ptr [ ebp - 36 ] , 00h ;0x0052bb2e : 8365dc00
Label52bb32 ::
;
; ------------------------------------------------------------------------------
; VFP 9.0 FIX - THE STRTOFILE() FUNCTION USES THE WINDOWS SYSTEM CACHE
; February 2019
; ------------------------------------------------------------------------------
; CCB
;
; The STRTOFILE() function uses the Windows system cache.
;
; 2019/2/28, by ccb
;
; mov dword ptr vfpa_strtofile_isstrtofile,01h
mov edx , dword ptr [ ebp - 36 ] ;0x0052bb32 : 8b55dc
and dword ptr [ ebp - 32 ] , 00h ;0x0052bb35 : 8365e000
or edx , 020h ;0x0052bb39 : 83ca20
lea ecx , dword ptr [ ebp + 0ECh ] ;0x0052bb3c : 8d8dec000000
call Fun42ce21 ;0x0052bb42 : e8da12f0ff
;
; ------------------------------------------------------------------------------
; VFP 9.0 FIX - THE STRTOFILE() FUNCTION USES THE WINDOWS SYSTEM CACHE
; February 2019
; ------------------------------------------------------------------------------
; CCB
;
; The STRTOFILE() function uses the Windows system cache.
;
; 2019/2/28, by ccb
;
Label52bb46 ::
; mov dword ptr vfpa_strtofile_isstrtofile,00h
Label52bb47 ::
mov edi , eax ;0x0052bb47 : 8bf8
cmp edi , 0FFFFFFFFh ;0x0052bb49 : 83ffff
mov dword ptr [ ebp - 40 ] , edi ;0x0052bb4c : 897dd8
je Label52bb80 ;0x0052bb4f : 742f
mov eax , dword ptr [ ebp - 28 ] ;0x0052bb51 : 8b45e4
dec eax ;0x0052bb54 : 48
jne Label50b7ad ;0x0052bb55 : 0f8552fcfdff
call Fun433ef7 ;0x0052bb5b : e89783f0ff
mov edx , dword ptr [ Data93757c ] ;0x0052bb60 : 8b157c759300
mov ecx , edi ;0x0052bb66 : 8bcf
imul ecx , ecx , 038h ;0x0052bb68 : 6bc938
mov dword ptr [ ecx + edx + 4 ] , eax ;0x0052bb6b : 89441104
Label52bb6f ::
push dword ptr [ esi + 8 ] ;0x0052bb6f : ff7608
mov eax , dword ptr [ esi + 32 ] ;0x0052bb72 : 8b4620
push dword ptr [eax] ;0x0052bb75 : ff30
push edi ;0x0052bb77 : 57
call Fun431e4d ;0x0052bb78 : e8d062f0ff
add dword ptr [ ebp - 32 ] , eax ;0x0052bb7d : 0145e0
Label52bb80 ::
lea eax , dword ptr [ ebp - 48 ] ;0x0052bb80 : 8d45d0
push eax ;0x0052bb83 : 50
lea eax , dword ptr [ ebp - 128 ] ;0x0052bb84 : 8d4580
call Fun42d200 ;0x0052bb87 : e87416f0ff
cmp edi , 0FFFFFFFFh ;0x0052bb8c : 83ffff
je Label52bb98 ;0x0052bb8f : 7407
mov ecx , edi ;0x0052bb91 : 8bcf
call Fun42ddf2 ;0x0052bb93 : e85a22f0ff
Label52bb98 ::
neg ebx ;0x0052bb98 : f7db
sbb ebx , ebx ;0x0052bb9a : 1bdb
not ebx ;0x0052bb9c : f7d3
and ebx , dword ptr [ ebp - 32 ] ;0x0052bb9e : 235de0
mov dword ptr [ esi + 12 ] , ebx ;0x0052bba1 : 895e0c
mov dword ptr [ esi + 4 ] , 0Ah ;0x0052bba4 : c746040a000000
mov byte ptr [esi] , 049h ;0x0052bbab : c60649
Label52bbae ::
mov ecx , dword ptr [ ebp + 01F4h ] ;0x0052bbae : 8b8df4010000
call Fun42bf1d ;0x0052bbb4 : e86403f0ff
pop edi ;0x0052bbb9 : 5f
pop esi ;0x0052bbba : 5e
pop ebx ;0x0052bbbb : 5b
add ebp , 01F8h ;0x0052bbbc : 81c5f8010000
leave ;0x0052bbc2 : c9
ret ;0x0052bbc3 : 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_vfp9fix67.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix65.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix66.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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