How to resolve the algorithm Call a foreign-language function step by step in the PureBasic programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Call a foreign-language function step by step in the PureBasic programming language
Table of Contents
Problem Statement
Show how a foreign language function can be called from the language.
As an example, consider calling functions defined in the C language. Create a string containing "Hello World!" of the string type typical to the language. Pass the string content to C's strdup. The content can be copied if necessary. Get the result from strdup and print it using language means. Do not forget to free the result of strdup (allocated in the heap).
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Call a foreign-language function step by step in the PureBasic programming language
Source code in the purebasic programming language
; Call_a_foreign_language_function.fasm -> Call_a_foreign_language_function.obj
; the assembler code...
; format COFF or
; format COFF64 classic (DJGPP) variants of COFF file
; format MS COFF or
; format MS COFF64 Microsoft's variants of COFF file
format MS COFF
include "Win32A.Inc"
section ".text" executable readable code
proc strucase stdcall str:dword
xor eax,eax
mov ebx,[str]
strucase_loop:
mov al,byte[ebx]
cmp al,0
jz strucase_is_null_byte
cmp al,'a'
jb strucase_skip
cmp al,'z'
ja strucase_skip
and al,11011111b
strucase_skip:
; mov byte[ebx],al
xchg al,byte[ebx]
inc ebx
jmp strucase_loop
strucase_is_null_byte:
xor eax,eax
mov eax,[str]
ret
endp
public strucase as "_strucase@4"
; the PureBasic code...
Import "Call_a_foreign_language_function.obj"
strucase(t.s) As "_strucase@4"
EndImport
t.s="hElLo WoRld!!"
*r=StrUcase(t.s) ; PureBasic is case-insensitive
; cw(peeks(*r))
Debug peeks(*r)
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