------------------------------------------------------------------------------------------------
                      [BUG/PRB.] VFP 9.0 FIX - CHECK THE DESTINATION FILE FOR THE CREATE TABLE FILE COMMANDS
                                  June 2022
                 ------------------------------------------------------------------------------------------------
                                     CCB



1. BUG:

     In vfp9 (and vfp6, vfp7, vfp8), for the create table file commands,
     if the file extension of the destination file is not .dbf,
     it will NOT delete the destination cdx file, sometimes the destination cdx file is damaged.

     There is a test program:

     *PROC testcopytotablefilewithcdx

     USE testtmpa.tmp
     COPY TO testtmpc.tmp WITH CDX
     USE

     RETURN

     * END OF PROC TESTCOPYTOTABLEFILEWITHCDX.

     We think it will run fine, but sometimes the destination cdx file is damaged.


2. CAUSE:

     In vfp9 (and vfp6, vfp7, vfp8), for the following COPY TO command:
     COPY TO test.dbf WITH CDX
     if the destination cdx file (test.cdx) exists, it will delete the destination cdx file first,
     and then copy data to the destination table file,
     and then create the destination cdx file.

     In vfp9 (and vfp6, vfp7, vfp8), for the following COPY TO command:
     COPY TO test.tmp WITH CDX
     if the destination cdx file (test.cdx) exists, it will NOT delete the destination cdx file,
     it will copy data to the destination table file,
     and then copy/add the tags and index expressions to the destination cdx file,
     sometimes the destination cdx file is damaged.

     In Visual FoxPro Advanced, for the following COPY TO commands:
     COPY TO test.dbf WITH CDX
     COPY TO test.tmp WITH CDX
     if the destination cdx file (test.cdx) exists, it will delete the destination cdx file first,
     and then copy data to the destination table file,
     and then create the destination cdx file.


3. RESOLUTION:

     We can write some code to fix the BUG.

     Fun4145d6 :: ; proc near
             push ebp                                                        ;0x004145d6 :        55
             mov ebp , esp                                                   ;0x004145d7 :        8bec
             and esp , 0FFFFFFF8h                                            ;0x004145d9 :        83e4f8
             sub esp , 021Ch                                                 ;0x004145dc :        81ec1c020000
             mov eax ,  dword ptr [ Data937090 ]                             ;0x004145e2 :        a190709300
             push ebx                                                        ;0x004145e7 :        53
             push esi                                                        ;0x004145e8 :        56
             mov  dword ptr [ esp + 0220h ] , eax                            ;0x004145e9 :        89842420020000
             push edi                                                        ;0x004145f0 :        57
             lea eax ,  dword ptr [ esp + 0118h ]                            ;0x004145f1 :        8d842418010000
             mov ebx , ecx                                                   ;0x004145f8 :        8bd9
             call Fun41975b                                                  ;0x004145fa :        e85c510000
             mov  eax , dword ptr [ ebp + 16 ]                               ;0x004145ff :        8b4510
             test eax , eax                                                  ;0x00414602 :        85c0
             je Label41464c                                                  ;0x00414604 :        7446


     ;
     ;                 -------------------------------------------------------------------------------------
     ;                      VFP 9.0 FIX - CHECK THE DESTINATION FILE FOR THE CREATE TABLE FILE COMMANDS
     ;                                  June 2022
     ;                 -------------------------------------------------------------------------------------
     ;                                     CCB
     ;
     ; Check the destination file for the create table file commands.
     ;
     ; 2022/6/17, by ccb
     ;

             cmp dword ptr vfpa_sys9102_data,00h
             je Label4148d0


             lea eax ,  dword ptr [ esp + 0118h ]                            ;0x00414606 :        8d842418010000
             pushd 05Ch                                                      ;0x0041460d :        6a5c
             push eax                                                        ;0x0041460f :        50
             call  dword ptr [ Data9370d0 ]                                  ;0x00414610 :        ff15d0709300
             add esp , 08h                                                   ;0x00414616 :        83c408
             test eax , eax                                                  ;0x00414619 :        85c0
             je Label57e7cd                                                  ;0x0041461b :        0f84aca11600

     Label414621 ::
             pushd 02Eh                                                      ;0x00414621 :        6a2e
             push eax                                                        ;0x00414623 :        50
             call  dword ptr [ Data9370d0 ]                                  ;0x00414624 :        ff15d0709300
             add esp , 08h                                                   ;0x0041462a :        83c408
             test eax , eax                                                  ;0x0041462d :        85c0
             je Label41464c                                                  ;0x0041462f :        741b
             inc eax                                                         ;0x00414631 :        40
             pushd offset Data919ea0                                                  ;0x00414632 :        68a09e9100
             push eax                                                        ;0x00414637 :        50
             call  dword ptr [ Data9370d8 ]                                  ;0x00414638 :        ff15d8709300
             add esp , 08h                                                   ;0x0041463e :        83c408
             neg eax                                                         ;0x00414641 :        f7d8
             sbb eax , eax                                                   ;0x00414643 :        1bc0
             inc eax                                                         ;0x00414645 :        40
             jne Label4148d0                                                 ;0x00414646 :        0f8584020000

     Label41464c ::
             mov  esi , dword ptr [ ebp + 8 ]                                ;0x0041464c :        8b7508
             mov  edx , dword ptr [ esi + 32 ]                               ;0x0041464f :        8b5620
             xor ecx , ecx                                                   ;0x00414652 :        33c9
             mov  cl , byte ptr [ Data933758 ]                               ;0x00414654 :        8a0d58379300
             and edx , 0FF7FFEC7h                                            ;0x0041465a :        81e2c7fe7fff
             xor eax , eax                                                   ;0x00414660 :        33c0
             mov  dword ptr [ esi + 8 ] , 0FFFFFFFFh                         ;0x00414662 :        c74608ffffffff
             mov  dword ptr [ esi + 36 ] , eax                               ;0x00414669 :        894624
             mov  dword ptr [esi] , ebx                                      ;0x0041466c :        891e
             mov  dword ptr [ esi + 40 ] , 01h                               ;0x0041466e :        c7462801000000
             and ecx , 01h                                                   ;0x00414675 :        83e101
             shl ecx , 03h                                                   ;0x00414678 :        c1e103
             or ecx , edx                                                    ;0x0041467b :        0bca
             or ecx , 03h                                                    ;0x0041467d :        83c903
             mov  dword ptr [ esi + 60 ] , eax                               ;0x00414680 :        89463c
             mov  dword ptr [ esi + 104 ] , eax                              ;0x00414683 :        894668
             mov  dword ptr [ esi + 32 ] , ecx                               ;0x00414686 :        894e20
             call  GetTickCount                                ;0x00414689 :        ff15f8709100
             mov edi , eax                                                   ;0x0041468f :        8bf8
             cmp  edi , dword ptr [ Data937ec8 ]                             ;0x00414691 :        3b3dc87e9300
             jb Label57e7e7                                                  ;0x00414697 :        0f824aa11600

     Label41469d ::
             push edi                                                        ;0x0041469d :        57
             pushd offset Data937ec8                                                  ;0x0041469e :        68c87e9300
             call  InterlockedExchange                         ;0x004146a3 :        ff1594719100
             mov eax ,  dword ptr [ Data937ec0 ]                             ;0x004146a9 :        a1c07e9300
             add eax , edi                                                   ;0x004146ae :        03c7
             mov  edi , dword ptr [ ebp + 24 ]                               ;0x004146b0 :        8b7d18
             mov  dword ptr [ esi + 0A8h ] , eax                             ;0x004146b3 :        8986a8000000
             mov eax , edi                                                   ;0x004146b9 :        8bc7
             mov  dword ptr [ esi + 0ACh ] , 00h                             ;0x004146bb :        c786ac00000000000000
             call Fun41e447                                                  ;0x004146c5 :        e87d9d0000
             push esi                                                        ;0x004146ca :        56
             call Fun414160                                                  ;0x004146cb :        e890faffff
             test eax , eax                                                  ;0x004146d0 :        85c0
             jne Label413e14                                                 ;0x004146d2 :        0f853cf7ffff

     Label4146d8 ::
             mov  dword ptr [ esi + 4 ] , 0FFFFFFFFh                         ;0x004146d8 :        c74604ffffffff

     Label4146df ::
             pushd 0181Ah                                                    ;0x004146df :        681a180000
             mov eax , 024h                                                  ;0x004146e4 :        b824000000
             call Fun42bf2a                                                  ;0x004146e9 :        e83c780100
             mov  dword ptr [ esi + 108 ] , eax                              ;0x004146ee :        89466c
             call Fun41979f                                                  ;0x004146f1 :        e8a9500000
             mov  eax , dword ptr [ esi + 32 ]                               ;0x004146f6 :        8b4620
             test  byte ptr ah , 084h                                        ;0x004146f9 :        f6c484
             jne Label517613                                                 ;0x004146fc :        0f85112f1000
             test al , al                                                    ;0x00414702 :        84c0
             js Label517613                                                  ;0x00414704 :        0f88092f1000
             mov  eax , dword ptr [ esi + 92 ]                               ;0x0041470a :        8b465c
             test eax , eax                                                  ;0x0041470d :        85c0
             jne Label517613                                                 ;0x0041470f :        0f85fe2e1000

     Label414715 ::
             mov  edx , dword ptr [ esi + 40 ]                               ;0x00414715 :        8b5628
             mov  ecx , dword ptr [ esp + 0224h ]                            ;0x00414718 :        8b8c2424020000
             mov  dword ptr [ esi + 44 ] , edx                               ;0x0041471f :        89562c
             mov eax ,  dword ptr [ Data93889c ]                             ;0x00414722 :        a19c889300
             mov  dword ptr [ esi + 0B8h ] , eax                             ;0x00414727 :        8986b8000000
             mov  dword ptr [ Data93889c ] , esi                             ;0x0041472d :        89359c889300
             call Fun42bf1d                                                  ;0x00414733 :        e8e5770100
             pop edi                                                         ;0x00414738 :        5f
             pop esi                                                         ;0x00414739 :        5e
             pop ebx                                                         ;0x0041473a :        5b
             mov esp , ebp                                                   ;0x0041473b :        8be5
             pop ebp                                                         ;0x0041473d :        5d
             ret 014h                                                        ;0x0041473e :        c21400


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.

     IMPORTANT NOTE:
     In vfp9 (and vfp6, vfp7, vfp8), we can delete the destination cdx file before run the COPY TO command, for example,
     IF FILE("test.tmp")
        DELETE FILE ("test.tmp")
     ENDIF
     IF FILE("test.cdx")
        DELETE FILE ("test.cdx")
     ENDIF
     COPY TO ("test.tmp") WITH CDX
     and then there is no the bug.


5. REFERENCE WEBSITES:

     1, baiyujia.com:
     http://www.baiyujia.com
     http://www.baiyujia.com/vfpdocuments/f_vfp9fix216.asp


6. OTHER:

     For reference only, there is no guarantees.

     Any questions or suggestions, please send me an email at ccb2000@163.com.