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POImplementing a header in Objective C
 

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  1. POImplementing a header in Objective C
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    <p>I'm completely new to <code>Objective C</code> and I'm trying to use it to wrap a <code>C-library</code>. I have a <code>main.m</code> <code>wrap.m</code> and <code>wrap.h</code> files. From what I gather in the header file I included <code>@interface</code> and in the source file I will include <code>@implementation</code> However I'm not really understanding what to include in each of them. Right now my main file is: </p> <pre><code>int copy_data(struct archive *ar, struct archive *aw) { for (;;) { const void *buff; size_t size; off_t offset; int r = archive_read_data_block(ar, &amp;buff, &amp;size, &amp;offset); if (r == ARCHIVE_EOF) return (ARCHIVE_OK); archive_write_data_block(aw, buff, size, offset); } } int main(int argc, const char * argv[]) { @autoreleasepool { struct archive *a; struct archive *ext; struct archive_entry *entry; int flags; int r; /* Select which attributes we want to restore. */ flags = ARCHIVE_EXTRACT_TIME; flags |= ARCHIVE_EXTRACT_PERM; flags |= ARCHIVE_EXTRACT_ACL; flags |= ARCHIVE_EXTRACT_FFLAGS; a = archive_read_new(); archive_read_support_format_all(a); archive_read_support_compression_all(a); ext = archive_write_disk_new(); archive_write_disk_set_options(ext, flags); archive_write_disk_set_standard_lookup(ext); r = archive_read_open_filename(a, argv[1], 10240); for (;;) { r = archive_read_next_header(a, &amp;entry); if (r == ARCHIVE_EOF) break; r = archive_write_header(ext, entry); if (archive_entry_size(entry) &gt; 0) { copy_data(a, ext); } archive_write_finish_entry(ext); } archive_read_close(a); archive_read_free(a); archive_write_close(ext); archive_write_free(ext); NSLog(@"No Issues"); } return 0; } </code></pre> <p>So far what I'm getting in my <code>wrap.h</code> file is: </p> <pre><code>typedef struct{ int *a; int *ext; }archive; @interface main : NSObject @property int flags; @property int r; </code></pre> <p>I don't know if that is close to what I need to do, and I'm getting errors on my <code>ARCHIVE_EXTRACT</code> saying they are undeclared identifiers which I assume also have to go into my <code>wrap.h</code> file but I'm not sure how to do that. Any help at all would be appreciated! </p>
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    1. USRyan Sayles
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    1. COYou're coding C methods, not Objective-C methods. No Objective-C object is being defined, so you code the .h as for C. No @interface, no properties.
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    2. COI'm making an Objective-C wrapper for my current code shown above so I do need Objective-C code
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