How do you convert C++ _tcscpy, _tcscat to Delphi? -

i'm converting this code c++ delphi don't following part of code. can explain me following code means; what's happening szbuff buffer ?

i'm pretty sure it's such kind of formatting (replacement), don't know expected result , can't find sensible documentation of used functions (maybe i'm lame :)

can me translation of code delphi (or direct me proper documentation) ?

i don't how convert kind of questions myself, mentioned @ least function names in question title might searchable else in future.

function tsecinfo.buildsecurityattributes(var secattrs: tsecurityattributes): boolean; var   pszsiduser: pchar;   szbuff: array [0..1024] of char; begin  // pszsiduser @ time contains user sid // s-1-5-21-1454471165-1004336348-1606980848-5555  // tchar szbuff[1024]; // i'm not sure array [0..1024] of char;    _tcscpy(szbuff, _t("d:"));   _tcscat(szbuff, _t("(a;;ga;;;"));   _tcscat(szbuff, pszsiduser);   _tcscat(szbuff, _t(")"));   _tcscat(szbuff, _t("(a;;gwgr;;;an)"));   _tcscat(szbuff, _t("(a;;gwgr;;;wd)"));  ...    _tcscat(szbuff, _t("s:(ml;;nw;;;s-1-16-0)"));  end; 

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thanks time
regards

_tcscpy , _tcscat tchar macro versions of c standard library functions strcpy , strcat copying , concatenating c strings. evaluate ansi or unicode versions depending on whether or type of project targeting. it's c code rather c++ code in view.

in delphi use string variables this:

function tsecinfo.buildsecurityattributes(var secattrs: tsecurityattributes): boolean; var   pszsiduser: pchar;   buff: string; begin   // pszsiduser @ time contains user sid   // s-1-5-21-1454471165-1004336348-1606980848-5555    buff := 'd:(a;;ga;;;'+pszsiduser+')(a;;gwgr;;;an)(a;;gwgr;;;wd)s:(ml;;nw;;;s-1-16-0)';   someotherwindowsapicall(pchar(buff));     end; 

presumably in c code there call windows api function receives lpctstr. c code pass szbuff can pass pchar(buff) have shown above.

the c code using fixed length buffer because doesn't have available dynamically allocated string class delphi's string or std::string in c++. fixed length buffers lead buffer overruns. in delphi don't use fixed length buffer if can avoid it.

this classic example of why languages built in string handling easier work c.