void blob_service_test_base_with_objects_to_delete::create_blobs(const azure::storage::cloud_blob_container& container, const utility::string_t& prefix, std::size_t num)
{
for (std::size_t i = 0; i < num; i++)
{
auto index = utility::conversions::print_string(i);
auto blob = container.get_block_blob_reference(prefix + index);
m_blobs_to_delete.push_back(blob);
blob.upload_text(U("test"), azure::storage::access_condition(), azure::storage::blob_request_options(), m_context);
}
}
// Note that, blob name is case sensitive.
void download_block_blob(azure::storage::cloud_blob_container &container,
const utility::string_t &blob_name, const utility::string_t &target_file_name,
utility::size64_t downloading_bytes_each_time)
{
auto blob = container.get_block_blob_reference(blob_name);
if (!blob.exists()) {
ucerr << U("Block blob \"") << blob_name << U("\" doesn't exist.\n");
return;
}
boost::filesystem::path target_path(target_file_name);
if (boost::filesystem::exists(target_path))
{
ucout << U("Warning! File \"") << target_file_name
<< U("\" already exists, and it will be overwrite.") << std::endl;
}
else
{
target_path.remove_filename();
if (!boost::filesystem::exists(target_path))
{
ucout << U("Creating directory \"") << target_path.string<utility::string_t>()
<< U("\"...") << std::endl;
if (!boost::filesystem::create_directories(target_path))
{
ucerr << U("Failed to create directory \"")
<< target_path.string<utility::string_t>() << U("\"!\n");
return;
}
}
}
// Get blob's size(in bytes)
auto blob_size = blob.properties().size();
if (0 == blob_size) {
blob.download_to_file(target_file_name);
return;
}
assert(downloading_bytes_each_time > 0);
if (downloading_bytes_each_time == 0 || downloading_bytes_each_time > blob_size) {
downloading_bytes_each_time = blob_size;
}
std::ofstream out_file(target_file_name, std::ofstream::binary);
if (!out_file) {
ucout << U("Opening file \"") << target_file_name << U("\" failed.\n");
return;
}
ucout << U("Downloading file to: ") << target_file_name << U("...");
boost::progress_display prog(blob_size);
utility::size64_t offset = 0;
utility::size64_t bytes_read;
while (offset < blob_size) {
// Create a memory buffer
concurrency::streams::container_buffer<std::vector<uint8_t>> buffer;
// Read data
concurrency::streams::ostream tmp_out_stream(buffer);
blob.download_range_to_stream(tmp_out_stream, offset, downloading_bytes_each_time);
bytes_read = buffer.collection().size();
// Write out...
out_file.write(reinterpret_cast<char *>(buffer.collection().data()), bytes_read);
//out_file.flush();
// Upgrade the progress bar and other states
prog += bytes_read;
offset += bytes_read;
}
// The last step...
blob.download_block_list();
}