Refine help message of client examples.

examples/client_basics.cc

@@ -50,6 +50,10 @@ int main() {
 
   } catch (const webcc::Error& error) {
     std::cerr << error << std::endl;
+    return 1;
+  } catch (const std::exception& e) {
+    std::cerr << e.what() << std::endl;
+    return 1;
   }
 
   return 0;

examples/file_upload_client.cc

@@ -5,19 +5,20 @@
 #include "webcc/client_session.h"
 #include "webcc/logger.h"
 
-void Help(const char* argv0) {
-  std::cout << "Usage: " << argv0 << " <upload_dir> [url]" << std::endl;
+void Help() {
+  std::cout << "Usage:" << std::endl;
+  std::cout << "    file_upload_client <upload_dir> [url]" << std::endl;
   std::cout << "Default Url: http://httpbin.org/post" << std::endl;
   std::cout << "E.g.," << std::endl;
-  std::cout << "    " << argv0 << "E:/github/webcc/data/upload" << std::endl;
-  std::cout << "    " << argv0
-            << "E:/github/webcc/data/upload http://httpbin.org/post"
+  std::cout << "    file_upload_client E:/github/webcc/data/upload"
             << std::endl;
+  std::cout << "    file_upload_client E:/github/webcc/data/upload"
+            << " http://httpbin.org/post" << std::endl;
 }
 
 int main(int argc, char* argv[]) {
   if (argc < 2) {
-    Help(argv[0]);
+    Help();
     return 1;
   }
 

examples/rest_book_client.cc

@@ -188,16 +188,17 @@ void PrintBookList(const std::list<Book>& books) {
 
 // -----------------------------------------------------------------------------
 
-void Help(const char* argv0) {
-  std::cout << "Usage: " << argv0 << " <url> [timeout]" << std::endl;
+void Help() {
+  std::cout << "Usage:" << std::endl;
+  std::cout << "    rest_book_client <url> [timeout]" << std::endl;
   std::cout << "E.g.," << std::endl;
-  std::cout << "    " << argv0 << " http://localhost:8080" << std::endl;
-  std::cout << "    " << argv0 << " http://localhost:8080 2" << std::endl;
+  std::cout << "    rest_book_client http://localhost:8080" << std::endl;
+  std::cout << "    rest_book_client http://localhost:8080 2" << std::endl;
 }
 
 int main(int argc, char* argv[]) {
   if (argc < 2) {
-    Help(argv[0]);
+    Help();
     return 1;
   }