From d4c024d779084661ff55b16bc167da952f93044d Mon Sep 17 00:00:00 2001
From: dapan1121 <89396746@qq.com>
Date: Thu, 22 Apr 2021 16:47:46 +0800
Subject: [PATCH] fix bug

---
 tests/examples/c/apitest.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/examples/c/apitest.c b/tests/examples/c/apitest.c
index 930a6075ca..f20c0321c4 100644
--- a/tests/examples/c/apitest.c
+++ b/tests/examples/c/apitest.c
@@ -435,11 +435,15 @@ void verify_async(TAOS* taos) {
 }
 
 void stream_callback(void *param, TAOS_RES *res, TAOS_ROW row) {
+  if (res == NULL || row == NULL) {
+    return;
+  }
+  
   int         num_fields = taos_num_fields(res);
   TAOS_FIELD* fields = taos_fetch_fields(res);
 
   printf("got one row from stream_callback\n");
-  char temp[256];
+  char temp[256] = {0};
   taos_print_row(temp, row, fields, num_fields);
   puts(temp);
 }
-- 
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