How to read multiple binary files in one array

vector<unsigned char> readFile(int count, ...) {
    va_list argptr;
    va_start(argptr, count);
    vector<unsigned char> data;
    for (int i = 0; i < count; i++) {
        char* name = va_arg(argptr, char*);
        streampos begin, end;
        ifstream file(name, ios::binary|ios::in|ios::ate);
        if (file.is_open()) {
            int size = int(file.tellg());
            file.seekg(0, ios::beg);
            char* memblock = new char[size];
  , size);
            data.insert(data.end(), memblock, memblock + size);
            delete[] memblock;
            cout << "Unable to open file: \"" << name << "\"" << endl;
    return data;

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