Re: DerelictVorbis and string pointer
On Sunday, 24 June 2018 at 01:54:52 UTC, Nicholas Wilson wrote: On Sunday, 24 June 2018 at 01:43:41 UTC, ANtlord wrote: On Sunday, 24 June 2018 at 01:26:48 UTC, ANtlord wrote: Actually I get it worked replacing `string filepath2` by `char[] filepath2` but filepath is string still and it works correctly. It doesn't work Vorbis is a C library, so you need to null terminate your string using toStringz. The reason why the one from the command line works is because it is already null terminate. It works! Thank you!
Re: DerelictVorbis and string pointer
On Sunday, 24 June 2018 at 01:43:41 UTC, ANtlord wrote: On Sunday, 24 June 2018 at 01:26:48 UTC, ANtlord wrote: Actually I get it worked replacing `string filepath2` by `char[] filepath2` but filepath is string still and it works correctly. It doesn't work Vorbis is a C library, so you need to null terminate your string using toStringz. The reason why the one from the command line works is because it is already null terminate.
Re: DerelictVorbis and string pointer
On 24/06/2018 1:26 PM, ANtlord wrote:
Hello D community!
I'm developing an application that must work on audio especially
playback Ogg files. So I took library DerelictVorbis [0] testing basic
functions like `ov_fopen`. The tests were successful so I decided to
implement core components of the application using D and Derelict
libraries.
Today I encountered a problem, the `ov_fopen` returns -1 instead of 0.
It means that something goes wrong and the file that is pointed by a
string is not opened. I figured out it so there is the error is not
occurred when a file path is pointed by a string variable from CLI input
arguments but it is occurred when the path is pointed by a string
variable filled dynamically (for example file path is read from another
file).
Here code goes
public import derelict.vorbis;
public import derelict.vorbis.file;
void main(string[] args) {
DerelictVorbis.load();
DerelictVorbisFile.load();
OggVorbis_File _ovFile;
immutable filepath = args[1];
import std.file;
import std.string;
string filepath2 = "./name.txt".readText.strip;
assert(filepath2 == filepath);
int res = ov_fopen(filepath2.ptr, &_ovFile); // res == -1
// int res = ov_fopen(filepath.ptr, &_ovFile); // res == 0
assert(res == 0, "ov_fopen returns %d".format(res));
}
Actually I get it worked replacing `string filepath2` by `char[]
filepath2` but filepath is string still and it works correctly.
So what detail The devil is in? Is there an issue in DerelictVorbis or
in compiler. Don't I know something about implementation of strings or
pointers in D?
Thanks in advance!
DMD 2.080
DerelictVorbis 2.0.0-beta.2
[0] https://github.com/DerelictOrg/DerelictVorbis
So where exactly is the null byte for the C string?
Re: DerelictVorbis and string pointer
On Sunday, 24 June 2018 at 01:26:48 UTC, ANtlord wrote: Actually I get it worked replacing `string filepath2` by `char[] filepath2` but filepath is string still and it works correctly. It doesn't work
DerelictVorbis and string pointer
Hello D community!
I'm developing an application that must work on audio especially
playback Ogg files. So I took library DerelictVorbis [0] testing
basic functions like `ov_fopen`. The tests were successful so I
decided to implement core components of the application using D
and Derelict libraries.
Today I encountered a problem, the `ov_fopen` returns -1 instead
of 0. It means that something goes wrong and the file that is
pointed by a string is not opened. I figured out it so there is
the error is not occurred when a file path is pointed by a string
variable from CLI input arguments but it is occurred when the
path is pointed by a string variable filled dynamically (for
example file path is read from another file).
Here code goes
public import derelict.vorbis;
public import derelict.vorbis.file;
void main(string[] args) {
DerelictVorbis.load();
DerelictVorbisFile.load();
OggVorbis_File _ovFile;
immutable filepath = args[1];
import std.file;
import std.string;
string filepath2 = "./name.txt".readText.strip;
assert(filepath2 == filepath);
int res = ov_fopen(filepath2.ptr, &_ovFile); // res == -1
// int res = ov_fopen(filepath.ptr, &_ovFile); // res == 0
assert(res == 0, "ov_fopen returns %d".format(res));
}
Actually I get it worked replacing `string filepath2` by `char[]
filepath2` but filepath is string still and it works correctly.
So what detail The devil is in? Is there an issue in
DerelictVorbis or in compiler. Don't I know something about
implementation of strings or pointers in D?
Thanks in advance!
DMD 2.080
DerelictVorbis 2.0.0-beta.2
[0] https://github.com/DerelictOrg/DerelictVorbis
