diff --git a/hgdriver/hgdev/hg_scanner_300.cpp b/hgdriver/hgdev/hg_scanner_300.cpp
index 496540d..1a5e56a 100644
--- a/hgdriver/hgdev/hg_scanner_300.cpp
+++ b/hgdriver/hgdev/hg_scanner_300.cpp
@@ -1,4 +1,4 @@
-#include "hg_scanner_300.h"
+#include "hg_scanner_300.h"
 #include "../wrapper/hg_log.h"
 
 #if defined(WIN32) || defined(_WIN64)
@@ -1564,7 +1564,10 @@ int hg_scanner_300::get_devs_cpu(string& cpu)
 	buff.resize(bufsize);
 	while (touch < usbcb.u32_Count) 
 	{
-		io_->read_bulk(&buff[0], &bufsize);
+		ret = io_->read_bulk(&buff[0], &bufsize);
+		if (SCANNER_ERR_OK != ret)
+			return ret;
+
 		out.write(&buff[0], bufsize);
 		touch += bufsize;
 		bufsize = bufsize > usbcb.u32_Count - touch ? usbcb.u32_Count - touch : bufsize;
@@ -1610,7 +1613,10 @@ int hg_scanner_300::get_devs_disk(string& disk)
 	buff.resize(bufsize);
 	while (touch < usbcb.u32_Count)
 	{
-		io_->read_bulk(&buff[0], &bufsize);
+		ret = io_->read_bulk(&buff[0], &bufsize);
+		if (SCANNER_ERR_OK != ret)
+			return ret;
+
 		out.write(&buff[0], bufsize);
 		touch += bufsize;
 		bufsize = bufsize > usbcb.u32_Count - touch ? usbcb.u32_Count - touch : bufsize;