windows - masm FPU to fasm FPU cannot translate and it does not work -

i have code in masm deal fpu , works great

in code number 2 different textboxes , divide them , output results textbox

this data local

local variable1 :qword local variable2 :qword local variable3 :qword  local string1[20]:byte local string2[20]:byte local string3[20]:byte 

this code

invoke getdlgitemtext,hwin,textbox1,addr string1,9 invoke strtofloat,addr string1,addr variable1  invoke getdlgitemtext,hwin,textbox2,addr string2,9 invoke strtofloat,addr string2,addr variable2  finit fld variable1 fld variable2 fdiv fstp variable3  invoke floattostr,variable3,addr string3 invoke setdlgitemtext,hwin,textbox3,addr string3 

i trying convert code fasm

this have far not working textbox3 says 0

this data (this not local data because have not learned how in fasm yet)

v1 dq ? v2 dq ? v3 dd ? v4 rb 20 

this code

invoke getdlgitemtexta,[hwin],textbox1,addr v1,100  invoke getdlgitemtexta,[hwin],textbox2,addr v2,100   finit fld qword [v1] fld qword [v2] fdivp fstp qword [v3]  cinvoke wsprintfa,addr v4,"%u",[v3] invoke setdlgitemtexta,[hwin],textbox3,addr v4 

i know code not right because not converting text float @ begining not know how to

i tried simpler version , did not work either

mov [v1],5.3 mov [v2],7.1  finit fld [v1] fld [v2] fdivp fstp [v3]  cinvoke wsprintfa,addr v4,"%u",[v3] invoke setdlgitemtexta,[hwin],maximumoutputpowertext,addr v4 

so question can please show me how read number 2 different textboxes , divide them , return result textbox using fasm code

thank you

there several problems in demonstrated code.

at first, not clear strtofloat procedure is? imported dll or part of code, or other library?

if procedure imported, has imported in fasm program well. else can written scratch or ported in source form masm program.

the immediate show stopper here mov [v1], float_constant instruction. reason v1 qword variable, mov can moves dword immediate values (even in 64bit environment).

mov dword [v1], 5.0 works fine, of course not op needs. floating qword constants can defined in compile time well: v1 dq 3.2

if want set qword floating constant in run time, have make in 2 instructions following way:

    = 5.3      mov  dword [var], (a , $ffffffff)     mov  dword [var+4], (a shr 32)      var dq ? 

the original fpu code in fasm syntax be:

    finit     fld  [variable1]     fdiv [variable2]     fstp [variable3]