Question about "Sub memcpy ..."

[Kernelpanic]

While reading the wiki I came across Offset(function): https://qb64phoenix.com/qb64wiki/index.p...(function)

The sub "memcpy" is apparently a fixed procedure, because when I changed the name there was an error during compilation.
What is this "memcpy"? Hard-wired?  I couldn't find anything about it in the wiki.

Code: (Select All)

Option _Explicit



Declare CustomType Library

  Sub zeichenKopieren (ByVal Ziel As _Offset, Byval Quelle As _Offset, Byval Bytes As Long)

End Declare



Dim As String zahlen, buchstaben



zahlen = "1234567890"

buchstaben = "ABCDEFGHIJ"



zeichenKopieren _Offset(zahlen) + 5, _Offset(buchstaben) + 5, 5

Print zahlen



End

internal\c\c_compiler\bin\c++.exe -Wl,--stack,26777216 -std=gnu++17 -fno-strict-aliasing -Wno-conversion-null -DGLEW_STATIC -DFREEGLUT_STATIC -Iinternal\c\libqb/include -Iinternal\c/parts/core/freeglut/include -Iinternal\c/parts/core/glew/include -DDEPENDENCY_NO_SOCKETS -DDEPENDENCY_NO_PRINTER -DDEPENDENCY_NO_ICON -DDEPENDENCY_NO_SCREENIMAGE internal\c/qbx.cpp -c -o internal\c/qbx.o
In file included from internal\c/qbx.cpp:1894:
internal\c/../temp/maindata.txt: In function 'void QBMAIN(void*)':
internal\c/../temp/maindata.txt:1:55: error: 'zeichenKopieren' was not declared in this scope
    1 | SUB_ZEICHENKOPIEREN=(CUSTOMCALL_SUB_ZEICHENKOPIEREN*)&zeichenKopieren;
      |                                                      ^~~~~~~~~~~~~~~
mingw32-make: *** [Makefile:402: internal\c/qbx.o] Error 1

That is OK.

Code: (Select All)

'12. Juli 2024



Option _Explicit



Declare CustomType Library

  Sub memcpy (ByVal Ziel As _Offset, Byval Quelle As _Offset, Byval Bytes As Long)

End Declare



Dim As String zahlen, buchstaben



zahlen = "1234567890"

buchstaben = "ABCDEFGHIJ"



memcpy _Offset(zahlen) + 5, _Offset(buchstaben) + 5, 5

Print zahlen



End

[Pete]

MEMCPY() is a C++ statement. My guess is you may be correct is presuming it is 'hard copied' as a C++ library function.

Pete

[Kernelpanic]

MEMCPY() is a C++ statement. My guess is you may be correct is presuming it is 'hard copied' as a C++ library function.

Pete

Ah thanks, that explains the error message.

[Kernelpanic]

Yes, memcpy() is a C function:

Code: (Select All)

//memcpy(), C-Befehlsbibliothek S. 323

//12. Juli 2023



#include <stdio.h>

#include <stdlib.h>

#include <string.h>



#define GROESSE 50



int main(void)

{

char puffer1[GROESSE], puffer2[GROESSE];



strcpy(puffer1, "Das ist ein Test!");

printf("\nPuffer1: ");

printf(puffer1);



//Inhalt von P1 nach P2 kopieren

memcpy(puffer2, puffer1, GROESSE);

printf("\n\nKopiert nach Puffer2: ");

printf (puffer2);



return(0);

}

[SMcNeill]

Not to be confused with _MEMCOPY, which is one of our built-in mem commands: https://qb64phoenix.com/qb64wiki/index.php/MEMCOPY

[Kernelpanic]

Not to be confused with _MEMCOPY, which is one of our built-in mem commands: https://qb64phoenix.com/qb64wiki/index.php/MEMCOPY

Yes, thanks! I looked at everything, but couldn't find it using memcpy.