Matthew Gamble via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Jul 2 11:05:30 PDT 2015
On Thursday, 2 July 2015 at 12:36:35 UTC, Nicholas Wilson wrote:
> On Thursday, 2 July 2015 at 03:07:43 UTC, Matthew Gamble wrote:
>> I am trying to make the transition from C++ to D. I've hit a
>> snag with the etc.c.zlib module where any attempt to use this
>> module to open a file yields an error:
>> Error 42: Symbol Undefined __lseeki64.
>> Here is a simple example of code that gives the error upon
>> import std.stdio;
>> import etc.c.zlib;
>> void main(string args)
>> char fName = "C:\\Users\\Matthew
>> char mode ="r\0".dup;
>> gzFile bamFile; //no error here
>> bamFile = gzopen(&fName,&mode); //this is where the
>> error hits
> Is that a compiler error or a linker error?
>>I'm probably doing something obviously wrong, so have mercy. If
>> is not the preferred way to read from a binary gzipped file
>> any advice would be appreciated. Thanks.
>>char fName = "C:\\Users\\Matthew
>>bamFile = gzopen(&fName,&mode);
> would be probably be more easily understood if written as:
> string fName = "C:\\Users\\Matthew
> bamFile = gzopen(fName.ptr,mode.ptr);
> as string _literals_ are nul terminated in D ( but not
> dynamically constructed ones: use .toStringz on them) assuming
> that gzopen doesn't manipulate it's arguments (I would very
> much doubt that).
> Also if you're trying to do bam parsing/manipulating/whatever
> try to get a hold of Artem Tarasov who occasionally posts on
> these forums. He wrote the worlds fastest bam parser in D. He
> might be able to give you some hints on further questions.
Thanks for the style tips. I will incorporate them in the future.
I was digging through Artem's BAM parser code and it also makes
use of a stripped down version of etc.c.zlib, so it seems like I
would have the same problem if I was to compile his parser, but I
can try that and perhaps alter my program to make use of pipes
from Sambamba. That's not something I've considered before.
However, I only need the positional and flag information from the
BAM files and I have previously written a parser in C++ using
zlib that could do the job. I was just trying to move that parser
over to D as a learning experience and so that I could easily
incorporate it with the other programs I will write in D.
Here is the full output upon building the program in VS2013 with
------ Build started: Project: zlibTest, Configuration: Release
OPTLINK (R) for Win32 Release 8.00.17
Copyright (C) Digital Mars 1989-2013 All rights reserved.
Error 42: Symbol Undefined __lseeki64
Building Release\zlibTest.exe failed!
Details saved as "file://C:\Users\Matthew Gamble\documents\visual
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped
Seems like a linking issue. I tried adding
"C:\D\dmd2\windows\lib" to the lib search path in the linker
properties in VS, But that did not help.
I would have thought that linking to a module in phobos would be
automatic, like for std.stdio. Is that not the case?
Any advice or tips would be appreciated.
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