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authorPetteri Aimonen <jpa@npb.mail.kapsi.fi>2011-08-22 15:22:41 +0000
committerPetteri Aimonen <jpa@npb.mail.kapsi.fi>2011-08-22 15:22:41 +0000
commit494fbd91e4e5574a4cf8dbe69b3f80a08e97e85b (patch)
treebdcd9d84aecda89d3af602c8ffccb9ffa5518561 /example/client.c
parent7f53c3f7484679c1e38607f59542d43be1387650 (diff)
example client
git-svn-id: https://svn.kapsi.fi/jpa/nanopb@958 e3a754e5-d11d-0410-8d38-ebb782a927b9
Diffstat (limited to 'example/client.c')
-rw-r--r--example/client.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/example/client.c b/example/client.c
new file mode 100644
index 00000000..f0520574
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+++ b/example/client.c
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+/* This is a simple TCP client that connects to port 1234 and prints a list
+ * of files in a given directory.
+ *
+ * It directly deserializes and serializes messages from network, minimizing
+ * memory use.
+ *
+ * For flexibility, this example is implemented using posix api.
+ * In a real embedded system you would typically use some other kind of
+ * a communication and filesystem layer.
+ */
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <pb_encode.h>
+#include <pb_decode.h>
+
+#include "fileproto.h"
+#include "common.h"
+
+bool printfile_callback(pb_istream_t *stream, const pb_field_t *field, void *arg)
+{
+ FileInfo fileinfo;
+
+ if (!pb_decode(stream, FileInfo_fields, &fileinfo))
+ return false;
+
+ printf("%-10lld %s\n", fileinfo.inode, fileinfo.name);
+
+ return true;
+}
+
+bool listdir(int fd, char *path)
+{
+ ListFilesRequest request;
+ ListFilesResponse response;
+ pb_istream_t input = pb_istream_from_socket(fd);
+ pb_ostream_t output = pb_ostream_from_socket(fd);
+ uint8_t zero = 0;
+
+ if (path == NULL)
+ {
+ request.has_path = false;
+ }
+ else
+ {
+ request.has_path = true;
+ if (strlen(path) + 1 > sizeof(request.path))
+ {
+ fprintf(stderr, "Too long path.\n");
+ return false;
+ }
+
+ strcpy(request.path, path);
+ }
+
+ if (!pb_encode(&output, ListFilesRequest_fields, &request))
+ {
+ fprintf(stderr, "Encoding failed.\n");
+ return false;
+ }
+
+ /* We signal the end of request with a 0 tag. */
+ pb_write(&output, &zero, 1);
+
+ response.file.funcs.decode = &printfile_callback;
+
+ if (!pb_decode(&input, ListFilesResponse_fields, &response))
+ {
+ fprintf(stderr, "Decoding failed.\n");
+ return false;
+ }
+
+ if (response.path_error)
+ {
+ fprintf(stderr, "Server reported error.\n");
+ return false;
+ }
+
+ return true;
+}
+
+int main(int argc, char **argv)
+{
+ int sockfd;
+ struct sockaddr_in servaddr;
+ char *path = NULL;
+
+ if (argc > 1)
+ path = argv[1];
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+
+ memset(&servaddr, 0, sizeof(servaddr));
+ servaddr.sin_family = AF_INET;
+ servaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ servaddr.sin_port = htons(1234);
+
+ if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0)
+ {
+ perror("connect");
+ return 1;
+ }
+
+ if (!listdir(sockfd, path))
+ return 2;
+
+ close(sockfd);
+
+ return 0;
+}