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[BUG/PRB.] VFP 9.0 FIX - FIX THE ANCHOR PROPERTY
January 2024
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CCB
1. BUG:
In vfp9, the Anchor property can only work fine when the Form.ScaleMode property is 3 (Pixels),
it can not work fine when the Form.ScaleMode property is 0 (Foxels).
The bug only occurs when the Form.ScaleMode property is 0 (Foxels).
The bug only occurs when the Anchor property includes the following flags:
4 (Bottom Absolute), 8 (Right Absolute), 16 (Top Relative), 32 (Left Relative),
64 (Bottom Relative), 128 (Right Relative), 256 (Horizontal Fixed Size), 512 (Vertical Fixed Size).
The bug also occurs for the PageFrame control when we set the TabOrientation property.
In vfp9, the Anchor property can not work fine when the Form.ScaleMode property is 0 (Foxels), please refer to the picture testanchor-vfp9.jpg:
2. CAUSE:
In vfp9, when Form.ScaleMode property is 0 (Foxels),
it ALWAYS calls the Move() Method with Pixel values,
it will NOT convert Pixel values to Foxel values.
For example,
in the caller:
THIS.Move(10,20) && nLeft = 10 Pixels, nTop = 20 Pixels
in the callee:
nLeft = 10 Foxels, nTop = 20 Foxels
they are incorrect!
In VFP Advanced, when Form.ScaleMode property is 0 (Foxels),
it will convert Pixel values to Foxel values,
and then the object will be displayed normal.
3. RESOLUTION:
We can write some code to fix the BUG.
Label50641a ::
xor eax , eax ;0x0050641a : 33c0
mov dword ptr [ ebp + 64 ] , 01h ;0x0050641c : c7454001000000
call Fun42c118 ;0x00506423 : e8f05cf2ff
mov esi , dword ptr [ Data9370c4 ] ;0x00506428 : 8b35c4709300
mov eax , ebx ;0x0050642e : 8bc3
imul eax , eax , 02Ch ;0x00506430 : 6bc02c
mov ecx , esp ;0x00506433 : 8bcc
sub ecx , esi ;0x00506435 : 2bce
cmp ecx , eax ;0x00506437 : 3bc8
jle Label5bc9e4 ;0x00506439 : 0f8ea5650b00
add eax , 07h ;0x0050643f : 83c007
and eax , 0FFFFFFF8h ;0x00506442 : 83e0f8
call Fun42c118 ;0x00506445 : e8ce5cf2ff
mov edi , esp ;0x0050644a : 8bfc
Label50644c ::
test edi , edi ;0x0050644c : 85ff
mov dword ptr [ ebp + 84 ] , edi ;0x0050644e : 897d54
je Label5bc9eb ;0x00506451 : 0f8494650b00
test ebx , ebx ;0x00506457 : 85db
jbe Label502a79 ;0x00506459 : 0f861ac6ffff
mov esi , ebx ;0x0050645f : 8bf3
imul esi , esi , 0FFFFFFD4h ;0x00506461 : 6bf6d4
Label506464 ::
mov ecx , dword ptr [ Data9370f0 ] ;0x00506464 : 8b0df0709300
push edi ;0x0050646a : 57
lea edx , dword ptr [ esi + ecx + 44 ] ;0x0050646b : 8d540e2c
push edx ;0x0050646f : 52
call Fun505990 ;0x00506470 : e81bf5ffff
add edi , 02Ch ;0x00506475 : 83c72c
add esi , 02Ch ;0x00506478 : 83c62c
dec ebx ;0x0050647b : 4b
;
; -------------------------------------------------
; VFP 9.0 FIX - FIX THE ANCHOR PROPERTY
; September 2021
; -------------------------------------------------
; CCB
;
; In vfp9, the Anchor property can only work fine when the Form.ScaleMode property is 3 (Pixels),
; it can not work fine when the Form.ScaleMode property is 0 (Foxels).
; Now the Anchor property can work fine when the Form.ScaleMode property is 3 (Pixels) or 0 (Foxels).
;
; 2021/9/18, by ccb
;
; je Label502a79 ;0x0050647c : 0f84f7c5ffff
; jmp Label506464 ;0x00506482 : ebe0
jne Label506464 ;0x00506482 : ebe0
cmp dword ptr vfpa_sys9070_data,00h
je Label502a79
cmp dword ptr vfpa_movemethod_inmovemethod,00h
je Label502a79
cmp dword ptr [ ebp + 92 ] , 0107h
jne Label502a79
cmp dword ptr [ ebp + 116 ] , 04h
jne Label502a79
mov eax , dword ptr [ ebp + 84 ]
cmp byte ptr [eax] , 49h
jne Label502a79
add eax , 2Ch
cmp byte ptr [eax] , 49h
jne Label502a79
add eax , 2Ch
cmp byte ptr [eax] , 49h
jne Label502a79
add eax , 2Ch
cmp byte ptr [eax] , 49h
jne Label502a79
push edi
mov edi , dword ptr [ ebp + 96 ]
call Fun4f1526
pop edi
cmp eax , 00h
jne Label502a79
sub esp , 10h
lea eax , dword ptr [ esp ]
push eax
mov eax , dword ptr [ ebp + 96 ]
call Fun507352
mov ecx , dword ptr [ ebp + 84 ]
fild dword ptr [ ecx + 12 ]
mov edx , dword ptr [eax]
movzx edx ,word ptr [ edx + 0160h ]
mov dword ptr [ esp ] , edx
fild dword ptr [ esp ]
fdivr st(0) , st(1)
fstp qword ptr [ ecx + 16 ]
mov byte ptr [ecx] , 04Eh
mov dword ptr [ ecx + 4 ] , 0Fh
mov dword ptr [ ecx + 8 ] , 02h
fstp st(0)
add ecx , 2Ch
fild dword ptr [ ecx + 12 ]
mov edx , dword ptr [eax]
movzx edx ,word ptr [ edx + 0162h ]
mov dword ptr [ esp ] , edx
fild dword ptr [ esp ]
fdivr st(0) , st(1)
fstp qword ptr [ ecx + 16 ]
mov byte ptr [ecx] , 04Eh
mov dword ptr [ ecx + 4 ] , 0Fh
mov dword ptr [ ecx + 8 ] , 02h
fstp st(0)
add ecx , 2Ch
fild dword ptr [ ecx + 12 ]
mov edx , dword ptr [eax]
movzx edx ,word ptr [ edx + 0160h ]
mov dword ptr [ esp ] , edx
fild dword ptr [ esp ]
fdivr st(0) , st(1)
fstp qword ptr [ ecx + 16 ]
mov byte ptr [ecx] , 04Eh
mov dword ptr [ ecx + 4 ] , 0Fh
mov dword ptr [ ecx + 8 ] , 02h
fstp st(0)
add ecx , 2Ch
fild dword ptr [ ecx + 12 ]
mov edx , dword ptr [eax]
movzx edx ,word ptr [ edx + 0162h ]
mov dword ptr [ esp ] , edx
fild dword ptr [ esp ]
fdivr st(0) , st(1)
fstp qword ptr [ ecx + 16 ]
mov byte ptr [ecx] , 04Eh
mov dword ptr [ ecx + 4 ] , 0Fh
mov dword ptr [ ecx + 8 ] , 02h
fstp st(0)
add esp , 10h
jmp Label502a79
Now in VFP Advanced, the Anchor property can work fine when the Form.ScaleMode property is 3 (Pixels) or 0 (Foxels).
Please refer to the picture testanchor-vfpa.jpg:
4. APPLIES TO:
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_vfp9fix196.asp
2, foxite.com:
https://www.foxite.com/archives/items-on-form-disappear-0000376871.htm
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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