Added error checking for samples.

docs/examples/anyauthput.c

@@ -162,6 +162,10 @@ int main(int argc, char **argv)
 
     /* Now run off and do what you've been told! */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/debug.c

@@ -132,6 +132,10 @@ int main(void)
 
     curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/fileupload.c

@@ -64,14 +64,21 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK) {
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
-    /* now extract transfer info */
-    curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed_upload);
-    curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &total_time);
+    }
+    else {
+      /* now extract transfer info */
+      curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed_upload);
+      curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &total_time);
 
-    fprintf(stderr, "Speed: %.3f bytes/sec during %.3f seconds\n",
-            speed_upload, total_time);
+      fprintf(stderr, "Speed: %.3f bytes/sec during %.3f seconds\n",
+              speed_upload, total_time);
 
+    }
     /* always cleanup */
     curl_easy_cleanup(curl);
   }

docs/examples/ftpgetresp.c

@@ -60,6 +60,10 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_response);
     curl_easy_setopt(curl, CURLOPT_WRITEHEADER, respfile);
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/ftpupload.c

@@ -122,6 +122,10 @@ int main(void)
 
     /* Now run off and do what you've been told! */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* clean up the FTP commands list */
     curl_slist_free_all (headerlist);

docs/examples/http-post.c

@@ -38,6 +38,10 @@ int main(void)
 
     /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/httpcustomheader.c

@@ -38,10 +38,18 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_URL, "localhost");
     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* redo request with our own custom Accept: */
     res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/httpput.c

@@ -110,6 +110,10 @@ int main(int argc, char **argv)
 
     /* Now run off and do what you've been told! */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/https.c

@@ -55,7 +55,12 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 #endif
 
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/persistant.c

@@ -37,12 +37,24 @@ int main(void)
 
     /* get the first document */
     curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
+
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* get another document from the same server using the same
        connection */
     curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/docs/");
+
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/pop3s.c

@@ -59,7 +59,12 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 #endif
 
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/pop3slist.c

@@ -59,7 +59,12 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 #endif
 
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/post-callback.c

@@ -120,6 +120,10 @@ int main(void)
 
     /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/postit2.c

@@ -83,7 +83,13 @@ int main(int argc, char *argv[])
       /* only disable 100-continue header if explicitly requested */
       curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
     curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
+
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/simple.c

@@ -30,7 +30,13 @@ int main(void)
   curl = curl_easy_init();
   if(curl) {
     curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/simplepost.c

@@ -39,7 +39,12 @@ int main(void)
        itself */
     curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
 
+    /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);

docs/examples/simplesmtp.c

@@ -65,6 +65,10 @@ int main(void)
 
     /* send the message (including headers) */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* free the list of recipients */
     curl_slist_free_all(recipients);

docs/examples/simplessl.c

@@ -118,7 +118,13 @@ int main(void)
       /* disconnect if we can't validate server's cert */
       curl_easy_setopt(curl,CURLOPT_SSL_VERIFYPEER,1L);
 
+      /* Perform the request, res will get the return code */
       res = curl_easy_perform(curl);
+      /* Check for errors */
+      if(res != CURLE_OK)
+        fprintf(stderr, "curl_easy_perform() failed: %s\n",
+                curl_easy_strerror(res));
+
       break;                   /* we are done... */
     }
     /* always cleanup */

docs/examples/smtp-tls.c

@@ -139,6 +139,10 @@ int main(void)
 
     /* send the message (including headers) */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* free the list of recipients and clean up */
     curl_slist_free_all(recipients);