Unable to open .bam file in C++ using SeqAn due to 'seqan::UnknownExtensionError'

I am trying to open .bam files in C++ to extract reads occurring at specific scaffolds and loci. I essentially want to call "samtools view sample.bam -o sample.sam scaffold:pos-pos" from C++. I have tried system("samtools view sample.bam -o sample.sam scaffold:pos-pos") and can explain the issues if you want to know, but for the sake of conciseness I will leave the details out of this post. So, I am using SeqAn. When I run my script, I get the following error:

terminate called after throwing an instance of 'seqan::UnknownExtensionError'
  what():  Unknown file extension of copyPolly_SRR6511930.bam: iostream error

I am running my program on my institution’s supercomputer clusters (Texas A&M Terra cluster), to which I do not have sudo access. I have loaded the following modules:

GCC/9.3.0
SeqAn/2.4.0-GCCcore-9.3.0
zlib/1.2.11-GCCcore-9.3.0

Here is my minimal script:

#include <seqan/bam_io.h>
#include <zlib.h>

using namespace seqan;

int main(){
    CharString bamFileName = "copyPolly_SRR6511930.bam";
// Open input file.
    BamFileIn bamFileIn(toCString(bamFileName));
    if (!open(bamFileIn, toCString(bamFileName))){
        std::cerr << "ERROR: Could not open " << bamFileName << std::endl;
        return 1;
    }

    unsigned numUnmappedReads = 0;

    try{
        // Read header.
        BamHeader header;
        readHeader(header, bamFileIn);

        // Read records.
        BamAlignmentRecord record;
        while (!atEnd(bamFileIn)){
            readRecord(record, bamFileIn);
            if (hasFlagUnmapped(record))
                numUnmappedReads += 1;
        }
    }
    catch (Exception const & e)
    {
        std::cout << "ERROR: " << e.what() << std::endl;
        return 1;
    }
    return 0;
}

I have tried the following solutions:

-Adding #define SEQAN_HAS_ZLIB (1) to my script’s header

-Adding -D SEQAN_HAS_ZLIB to my compilation such that it reads g++ script.cpp -D SEQAN_HAS_ZLIB

-Adding -lz to my compilation such that it reads g++ script.cpp -lz

I am not dead-set on using SeqAn for this project, so if anyone knows of another C++ library which extracts specific reads from .bam files, please share.

Update: I’ve never used HTSlib and it seems to have a fairly steep learning curve, so if anyone has an answer for the SeqAn error, that would still be very much appreciated.

g++ seqan_test.cpp -DSEQAN_HAS_ZLIB -lz -lpthread

#include "htslib/sam.h"
int main(int argc, char *argv[])
{
  samFile *fp = sam_open(argv[1], "r");
  bam_hdr_t *h = sam_hdr_read(fp);
  bam1_t *b = bam_init1();
  while (sam_read1(fp, h, b) >= 0) {
    if (b->core.tid < 0) continue;
    int end_pos = bam_endpos(b);
    printf("%st%dt%dn", h->target_name[b->core.tid], b->core.pos, end_pos);
  }
  bam_destroy1(b);
  bam_hdr_destroy(h);
  sam_close(fp);
}

#include <seqan/bam_io.h>
using namespace seqan;

int main(){
    CharString bamFileName = "copyPolly_SRR6511930.bam";
    // Open input file, BamFileIn can read SAM and BAM files.
    BamFileIn bamFileIn;
    if (!open(bamFileIn, toCString(bamFileName))) {
        std::cerr << "ERROR: Could not open " << bamFileName << std::endl;
        return 1;
    }
    return 0;
}