• John Kiro (24/24) Jan 07 2007 Hello
• Thomas Kuehne (10/14) Jan 07 2007 -----BEGIN PGP SIGNED MESSAGE-----
• John Kiro (5/20) Jan 08 2007 bit PCM".ptr);
• novice2 (9/9) Jan 08 2007 sorry, may be i missing something, but imho
• John Kiro (4/13) Jan 09 2007 YES.. It works perfectly! thanks for saving me some extra characters

John Kiro <johnkirollos yahoo.com> writes:

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

Thomas Kuehne <thomas-dloop kuehne.cn> writes:

-----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

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=jKE1
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John Kiro <johnkirollos yahoo.com> writes:

== 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
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 iD8DBQFFoTMqLK5blCcjpWoRAi9QAKCrKAg24XBgAmUqketUykihMlmDuwCghbSZ
 0RyZAI6TWYdd5mtFLeEt0Uw=
 =jKE1
 -----END PGP SIGNATURE-----



Thanks Thomas ;-)


John

novice2 <sorry noem.ail> writes:

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);
}

John Kiro <johnkirollos yahoo.com> writes:

== 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