On Tuesday, 19 February 2013 at 17:40:03 UTC, John Colvin wrote:
D doesn't use null termination for it's strings, strings are
immutable(char)[]. You can form a D slice from a pointer by
going
slice = ptr[0..length]
where length is the length of the array the pointer represents.
You can't just take a c style string and expect writeln to work
with it.
I had tried to!string() and the slicing already but to no avail.
I think it has something to do with pointer and the stack. Here
is what I get
export void printThis(ref char[] str) {
printf("Incoming printf: %s\n", str);
writeln(str);
writeln(str.ptr);
writeln(str[0..5]);
writeln(to!string(str.ptr));
writeln(to!string(str.ptr[0..5]));
writeln(to!string(str)); // Error!
}
OUTPUT:
Incoming printf: Hello world
☺
27FBCC
☺
☺
☺
Traceback (most recent call last):
File "loaddll.py", line 6, in <module>
lib.printThis(c_char_p("Hello world"))
WindowsError: exception: access violation reading 0x00284000
If I use writefln("%s\n", str) I get the full garbage which
starts with
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ETC. ETC......
Also, I think you should have extern(C) in the function
definition.
I based the DLL on this how-to: http://dlang.org/dll.html
