De-Referencing A Pointer

[James Dunne]

Rory Starkweather wrote:
> I'm totally lost now. The DLL version didn't like the wchar* types and 
> it wouldn't compile. So I tried the command line version. It not only 
> compiled, it worked perfectly. (Except for tht nasty and long forgotten 
> 0 based things.)
> 
> So I copied the command line version over the DLL version and I get:
> 
> e:\DigitalMars\DMD\Bin\..\..\dm\bin\link.exe dinstr,,,user32+kernel32/noi;
> 
> OPTLINK (R) for Win32  Release 7.50B1
> Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
> 
> OPTLINK : Warning 23: No Stack
> dinstr.obj(dinstr)
>  Error 42: Symbol Undefined __nullext
> dinstr.obj(dinstr)
>  Error 42: Symbol Undefined __ModuleInfo_3std6string
> OPTLINK : Warning 134: No Start Address
> --- errorlevel 2
> 
> I can't see a difference between what is in DInStr.d now and the code 
> below that was posted before any changes. The new version is posted 
> below the >> version, which is from an earlier message at a time when it 
> compiled OK, but didn't work.
> 
>>> ******************************* Here's the ** OLD *** D code:
>>>
>>> //--------DInStr.d-----------
>>> import DLLMain;
>>> import std.string;      // For find
>>>
>>> extern (Windows)
>>> {
>>> int findACharInString(char* searchString, char* searchChar)
>>> {
>>> int iPointer = 0;
>>> char[] theChar;
>>> char[] theString;
>>>
>>> theString = std.string.toString(searchString);
>>> theChar = std.string.toString(searchChar);
>>>
>>> iPointer = find(theString, theChar);
>>>
>>> return (iPointer);
>>> }
>>> }
> 
> 
> ******************************* Here's the ** NEW *** D code:
> //--------DInStr.d-----------
> import DLLMain;
> import std.string;      // For find
> 
> extern (Windows)
> {
>  int findACharInString(char* searchString, char* searchChar)
>  {
>     int iPointer = 0;
>     char[] theChar;
>     char[] theString;
> 
>     theString = std.string.toString(searchString);
>     theChar = std.string.toString(searchChar);
> 
>     iPointer = find(theString, theChar);
> 
>    return (iPointer);
>   }
> }
> 
> As I said, I can't see the difference.
> 
> To confuse the issue even further, here's the commandline version, that 
> works perfectly. I realize that I am passing char[] to findACharInString 
> in this version but I don't see why it compiles without a hitch.
> 
> Command line used: DInstrCL Fred e
> 
> //--------DInStrCL.d-----------
> import DLLMain;
> import std.string;      // For find
> 
> extern (Windows)
> {
>  int findACharInString(char* searchString, char* searchChar)
>  {
>     int iPointer = 0;
>     char[] theChar;
>     char[] theString;
> 
>     theString = std.string.toString(searchString);
>     theChar = std.string.toString(searchChar);
> 
>     iPointer = find(theString, theChar);
> 
>    return (iPointer);
>   }
> }
> 
> void main(char[][] Args)
> {
>     int iRetVal;
> 
>     iRetVal = findACharInString(Args[1], Args[2]);
> 
>     printf("%.*s found at %d\n", Args[2], iRetVal);
> }

As much as I'd love to help you out, I'm also hopelessly lost.  Can you 
ZIP up your project and document your test cases and post them on the NG 
or e-mail them to me personally?  The e-mail I post with on the 
newsgroups is my valid e-mail.

-- 
Regards,
James Dunne