From d2d07100abec382c1163ec8ef16f1f16acb921b8 Mon Sep 17 00:00:00 2001
From: Matt Hill <matthill@openalpr.com>
Date: Mon, 17 Oct 2016 22:58:43 -0400
Subject: [PATCH] Added a function to the C binding to free a char* pointer

---
 src/bindings/c/alpr_c.cpp | 9 ++++++++-
 src/bindings/c/alpr_c.h   | 5 +++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/bindings/c/alpr_c.cpp b/src/bindings/c/alpr_c.cpp
index 4536a6a..cd207e5 100644
--- a/src/bindings/c/alpr_c.cpp
+++ b/src/bindings/c/alpr_c.cpp
@@ -21,7 +21,8 @@
 #include <alpr.h>
 #include <string.h>
 #include <vector>
-
+#include <stdlib.h>
+ 
 OPENALPRC_DLL_EXPORT OPENALPR* openalpr_init(const char* country, const char* configFile, const char* runtimeDir)
 {
   alpr::Alpr* alpr_inst = new alpr::Alpr(country, configFile, runtimeDir);
@@ -99,6 +100,12 @@ OPENALPRC_DLL_EXPORT char* openalpr_recognize_encodedimage(OPENALPR* instance, u
   return result_obj;
 }
 
+
+OPENALPRC_DLL_EXPORT void openalpr_free_response_string(char* response)
+{
+  free(response);
+}
+
 OPENALPRC_DLL_EXPORT void openalpr_cleanup(OPENALPR* instance)
 {
   delete ((alpr::Alpr*) instance);
diff --git a/src/bindings/c/alpr_c.h b/src/bindings/c/alpr_c.h
index 0219732..5212886 100644
--- a/src/bindings/c/alpr_c.h
+++ b/src/bindings/c/alpr_c.h
@@ -65,6 +65,11 @@ char* openalpr_recognize_rawimage(OPENALPR* instance, unsigned char* pixelData,
 // Recognizes the encoded (e.g., JPEG, PNG) image.  bytes are the raw bytes for the image data.
 char* openalpr_recognize_encodedimage(OPENALPR* instance, unsigned char* bytes, long long length, struct AlprCRegionOfInterest roi);
 
+// Frees a char* response that was provided from a recognition request.
+// This is required for interoperating with managed languages (e.g., C#) that can't free the memory themselves
+void openalpr_free_response_string(char* response);
+
+// Free the memory for the OpenALPR instance created with openalpr_init
 void openalpr_cleanup(OPENALPR* instance);