Hello

Consider the win32 case of inserting a string in a listbox, I need to convert a literal string to a pointer, and then to an int. I tried the following 2 solutions:

SendMessage(hListBox,LB_ADDSTRING,0,cast(int)cast(void*)cast(char[])"My
String");


SendMessage(hListBox,LB_ADDSTRING,0,cast(int)std.string.toStringz("My
String"));

They both seem to work fine, but I expect that the 1st method is
better in terms of performance; All that is needed, is the compiler
to store the string somewhere, and simply pass its pointer to
SendMessage(). No realtime processing is needed. So does the triple-
cast in the first method really do it this way?
Obviously, for the 2nd method, there is some processing, in calling
toStringz at least.

On the other hand, casting directly to void* does not work:
SendMessage(hwndLBPrecision,LB_ADDSTRING,0,cast(int)cast(void*)"8 bit
PCM");

Error: "cannot convert string literal to void*"

(isn't there any method easier than doing 3 casts?)

Another question is, where can I post a request of generating assembly code listing file? It would help in exploring the D language.

Thanks
John

John Kiro schrieb am 2007-01-07:
> On the other hand, casting directly to void* does not work:
> SendMessage(hwndLBPrecision,LB_ADDSTRING,0,cast(int)cast(void*)"8 bit
> PCM");
>
> Error: "cannot convert string literal to void*"

SendMessage(hwndLBPrecision,LB_ADDSTRING,0,cast(int)cast(void*)"8 bit PCM".ptr);

Thomas

== Quote from Thomas Kuehne (thomas-dloop@kuehne.cn)'s article
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> John Kiro schrieb am 2007-01-07:
> > On the other hand, casting directly to void* does not work:
> > SendMessage(hwndLBPrecision,LB_ADDSTRING,0,cast(int)cast(void*)"8
bit
> > PCM");
> >
> > Error: "cannot convert string literal to void*"
> SendMessage(hwndLBPrecision,LB_ADDSTRING,0,cast(int)cast(void*)"8
bit PCM".ptr);
> Thomas
> -----BEGIN PGP SIGNATURE-----
> iD8DBQFFoTMqLK5blCcjpWoRAi9QAKCrKAg24XBgAmUqketUykihMlmDuwCghbSZ
> 0RyZAI6TWYdd5mtFLeEt0Uw=
> =jKE1
> -----END PGP SIGNATURE-----



Thanks Thomas ;-)


John

sorry, may be i missing something, but imho
cast(void*)"str".ptr is too redundant.

for me this work:


import std.stdio;

void main()
{
  void* p = "str".ptr;
  writefln("p=%08X", p);
}

== Quote from novice2 (sorry@noem.ail)'s article
> sorry, may be i missing something, but imho
> cast(void*)"str".ptr is too redundant.
> for me this work:
> import std.stdio;
> void main()
> {
>   void* p = "str".ptr;
>   writefln("p=%08X", p);
> }

YES.. It works perfectly! thanks for saving me some extra characters to type, beside of course the added code clarity ;-)

John