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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/************* Restget C++ Program Source Code File (.CPP) *************/
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/* Adapted from the sample program of the Casablanca tutorial. */
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/* Copyright Olivier Bertrand 2019. */
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/***********************************************************************/
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#include <cpprest/filestream.h>
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#include <cpprest/http_client.h>
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using namespace utility::conversions; // String conversions utilities
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using namespace web; // Common features like URIs.
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using namespace web::http; // Common HTTP functionality
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using namespace web::http::client; // HTTP client features
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using namespace concurrency::streams; // Asynchronous streams
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typedef const char* PCSZ;
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extern "C" int restGetFile(char* m, bool xt, PCSZ http, PCSZ uri, PCSZ fn);
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/***********************************************************************/
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/* Make a local copy of the requested file. */
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/***********************************************************************/
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int restGetFile(char *m, bool xt, PCSZ http, PCSZ uri, PCSZ fn)
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{
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int rc = 0;
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auto fileStream = std::make_shared<ostream>();
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if (!http || !fn) {
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//strcpy(g->Message, "Missing http or filename");
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strcpy(m, "Missing http or filename");
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return 2;
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} // endif
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if (xt)
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fprintf(stderr, "restGetFile: fn=%s\n", fn);
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// Open stream to output file.
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pplx::task<void> requestTask = fstream::open_ostream(to_string_t(fn))
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.then([=](ostream outFile) {
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*fileStream= outFile;
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if (xt)
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fprintf(stderr, "Outfile isopen=%d\n", outFile.is_open());
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// Create http_client to send the request.
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http_client client(to_string_t(http));
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if (uri) {
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// Build request URI and start the request.
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uri_builder builder(to_string_t(uri));
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return client.request(methods::GET, builder.to_string());
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} else
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return client.request(methods::GET);
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})
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// Handle response headers arriving.
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.then([=](http_response response) {
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if (xt)
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fprintf(stderr, "Received response status code:%u\n",
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response.status_code());
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// Write response body into the file.
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return response.body().read_to_end(fileStream->streambuf());
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})
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// Close the file stream.
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.then([=](size_t n) {
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if (xt)
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fprintf(stderr, "Return size=%zu\n", n);
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return fileStream->close();
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});
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// Wait for all the outstanding I/O to complete and handle any exceptions
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try {
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if (xt)
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fprintf(stderr, "Waiting\n");
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requestTask.wait();
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} catch (const std::exception &e) {
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if (xt)
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fprintf(stderr, "Error exception: %s\n", e.what());
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sprintf(m, "Error exception: %s", e.what());
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rc= 1;
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} // end try/catch
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if (xt)
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fprintf(stderr, "restget done: rc=%d\n", rc);
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return rc;
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} // end of restGetFile
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