Re: Printing a C "string" with write(f)ln

[Daniel Kozak via Digitalmars-d-learn]

On Tuesday, 9 February 2016 at 16:58:03 UTC, Daniel Kozak wrote:

On Tuesday, 9 February 2016 at 16:52:09 UTC, Gary Willoughby wrote:

On Tuesday, 9 February 2016 at 12:50:27 UTC, Jakob Ovrum wrote:

writefln et al sensibly does *not* assume that a pointer to char is a C string, for memory safety purposes.

Print the result of std.string.fromStringz[1] instead:

writeln(fromStringz(pString));
writefln("%s", fromStringz(pString));

[1] http://dlang.org/phobos/std_string#fromStringz

Or use `to` like this:

import std.conv;
writefln("%s", pString.to!(string));

this will allocate new string which can be performance problem.
Maybe:

writefln("%s", pString.to!(char[]));

But I do not know if this works and does not allocate

void main() {
    char[] chars = cast(char[])"Ahoj svete";

    char* cstr = chars.ptr;
    auto s1 = to!string(cstr);
    auto s2 = to!(char[])(cstr);
    auto s3 = fromStringz(cstr);

    writeln(cstr);   //46D310
    writeln(s1.ptr); //7F0062EF1000
    writeln(s2.ptr); //7F0062EF1010
    writeln(s3.ptr); //46D310
}