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toaster
Joined: 03 Sep 2004
Posts: 7
Location: Lisbon
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 Posted: Fri Sep 03, 2004 9:34 am Post subject: sdlsem.d Access Violation (win) |
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I just came across D for the first time and right now i am browsing thru the documentation and playing with available stuff (like derelict).
I found that the sdlsem.d sample gives an Access Violation when executed without args:
C:\dmd\derelict-0.1>bin\sdlsem.exe
Usage: Error: Access Violation
C:\dmd\derelict-0.1>
It was easy to find the error (thanks to "Usage"):
| Code: |
int main(char[][] args)
{
if(args.length < 2)
{
fprintf(stderr, "Usage: ?s init_value\n", args[0]);
exit(1);
}
[...]
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This works fine (found by trial and error):
| Code: |
if(args.length < 2)
{
//fprintf(stderr, "Usage: ?s init_value\n", args[0]);
fprintf(stderr, "Usage: ?s init_value\n", cast(char*) args[0]);
exit(1);
}
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C:\dmd\derelict-0.1>bin\sdlsem.exe
Usage: C:\dmd\derelict-0.1\bin\sdlsem.exe init_value
C:\dmd\derelict-0.1>
However, I just "arrived" here so my question: is it a bug in sdlsem or in D?
I got the latest available dmd (dl'ed yesterday) and your ZIP from http://svn.dsource.org/svn/projects/derelict/downloads/derelict-0.1.zip
BTW: all the other tests run perfectly and sdlsem runs too (with at least 1 arg), and derelict is great. And D is great, yesterday i looked at it for the first time and I think I will use it. I hope D grows and derelict grows along. |
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aldacron
Joined: 05 May 2004
Posts: 1322
Location: Seoul, South Korea
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| Posted: Fri Sep 03, 2004 8:16 pm Post subject: Re: sdlsem.d Access Violation (win) |
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| toaster wrote: |
| Code: |
if(args.length < 2)
{
//fprintf(stderr, "Usage: ?s init_value\n", args[0]);
fprintf(stderr, "Usage: ?s init_value\n", cast(char*) args[0]);
exit(1);
}
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However, I just "arrived" here so my question: is it a bug in sdlsem or in D?
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It's a bug in the code, not D. I'll have that fixed for the next release. It has to do with the fact that D strings are stored internally in Pascal style (length followed by the string). Casting to char * allows you to pass the string itself without the length. But it still doesn't zero-terminate it (unless things have changed in the last few versions). So it would be more appropriate to use toStringz(arg[0]) (which can also be written as arg[0].toStringz()) rather than casting to char*.
Thanks for bringing this to my attention.
There have been several changes and additions to Derelict since 0.1 was released. I recommend that you checkout the latest trunk from SVN and use that instead. There have been a few bugfixes, SDL_image and SDL_audio have been added along with OpenAL, and the load functions have been renamed. I won't be changing the function names again, so if you use the current trunk you won't have to go back later and change your code. Furthermore, I won't be releasing 0.2 until I've completed the Python bindings and run everything through some tests. This is going to be a while yet as I've gotten my hands into too many pies for the time being.
| Quote: |
BTW: all the other tests run perfectly and sdlsem runs too (with at least 1 arg), and derelict is great. And D is great, yesterday i looked at it for the first time and I think I will use it. I hope D grows and derelict grows along. |
Glad you're enjoying it. Welcome aboard! |
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toaster
Joined: 03 Sep 2004
Posts: 7
Location: Lisbon
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| Posted: Sat Sep 04, 2004 7:51 am Post subject: |
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| Thank you for your attention and the insight about chars - one can do subtile bugs in a new language. So now i know it's a bad thing to cast strings into char pointers. Im gonna get your newest packages too. |
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