From 90a4b2be0ea3be40580fb0349dda7499c9473490 Mon Sep 17 00:00:00 2001
From: Matthew Hill <matthill@openalpr.com>
Date: Mon, 17 Oct 2016 16:08:23 -0400
Subject: [PATCH] Added windows DLL export to C lib

---
 src/bindings/c/CMakeLists.txt |  2 +-
 src/bindings/c/alpr_c.cpp     | 20 ++++++++++----------
 src/bindings/c/alpr_c.h       |  8 +++++++-
 3 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/src/bindings/c/CMakeLists.txt b/src/bindings/c/CMakeLists.txt
index 25d08e2..2f7e528 100644
--- a/src/bindings/c/CMakeLists.txt
+++ b/src/bindings/c/CMakeLists.txt
@@ -12,7 +12,7 @@ set(alprc_source
     
 add_library(openalprc SHARED ${alprc_source})
 
-set_target_properties(openalprc PROPERTIES SOVERSION ${OPENALPR_MAJOR_VERSION})
+#set_target_properties(openalprc PROPERTIES SOVERSION ${OPENALPR_MAJOR_VERSION})
 
 TARGET_LINK_LIBRARIES(openalprc openalpr)
 
diff --git a/src/bindings/c/alpr_c.cpp b/src/bindings/c/alpr_c.cpp
index 3ef6192..4536a6a 100644
--- a/src/bindings/c/alpr_c.cpp
+++ b/src/bindings/c/alpr_c.cpp
@@ -22,7 +22,7 @@
 #include <string.h>
 #include <vector>
 
-OPENALPR* openalpr_init(const char* country, const char* configFile, const char* runtimeDir)
+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);
   
@@ -30,35 +30,35 @@ OPENALPR* openalpr_init(const char* country, const char* configFile, const char*
 }
 
 // Set the country used for plate recognition
-void openalpr_set_country(OPENALPR* instance, const char* country)
+OPENALPRC_DLL_EXPORT void openalpr_set_country(OPENALPR* instance, const char* country)
 {
   ((alpr::Alpr*) instance)->setCountry(country);
 }
 
 // Update the prewarp setting without reloading the library
-void openalpr_set_prewarp(OPENALPR* instance, const char* prewarp_config)
+OPENALPRC_DLL_EXPORT void openalpr_set_prewarp(OPENALPR* instance, const char* prewarp_config)
 {
   ((alpr::Alpr*) instance)->setPrewarp(prewarp_config);
 }
 
 // Update the detection mask without reloading the library
-void openalpr_set_mask(OPENALPR* instance, unsigned char* pixelData, int bytesPerPixel, int imgWidth, int imgHeight)
+OPENALPRC_DLL_EXPORT void openalpr_set_mask(OPENALPR* instance, unsigned char* pixelData, int bytesPerPixel, int imgWidth, int imgHeight)
 {
   ((alpr::Alpr*) instance)->setMask(pixelData, bytesPerPixel, imgWidth, imgHeight);
 }
 
 // Enable/disable region detection.  Pass a 0 or 1
-void openalpr_set_detect_region(OPENALPR* instance, int detectRegion)
+OPENALPRC_DLL_EXPORT void openalpr_set_detect_region(OPENALPR* instance, int detectRegion)
 {
   ((alpr::Alpr*) instance)->setDetectRegion(detectRegion);
 }
 
-void openalpr_set_topn(OPENALPR* instance, int topN)
+OPENALPRC_DLL_EXPORT void openalpr_set_topn(OPENALPR* instance, int topN)
 {
   ((alpr::Alpr*) instance)->setTopN(topN);
 }
 
-void openalpr_set_default_region(OPENALPR* instance, const char* region)
+OPENALPRC_DLL_EXPORT void openalpr_set_default_region(OPENALPR* instance, const char* region)
 {
   ((alpr::Alpr*) instance)->setDefaultRegion(region);
 }
@@ -67,7 +67,7 @@ void openalpr_set_default_region(OPENALPR* instance, const char* region)
 
 // Recognizes the provided image and responds with JSON.  
 // Caller must call free() on the returned object
-char* openalpr_recognize_rawimage(OPENALPR* instance, unsigned char* pixelData, int bytesPerPixel, int imgWidth, int imgHeight, AlprCRegionOfInterest roi)
+OPENALPRC_DLL_EXPORT char* openalpr_recognize_rawimage(OPENALPR* instance, unsigned char* pixelData, int bytesPerPixel, int imgWidth, int imgHeight, AlprCRegionOfInterest roi)
 {
   std::vector<alpr::AlprRegionOfInterest> rois;
   alpr::AlprRegionOfInterest cpproi(roi.x, roi.y, roi.width, roi.height);
@@ -82,7 +82,7 @@ char* openalpr_recognize_rawimage(OPENALPR* instance, unsigned char* pixelData,
   
 }
 
-char* openalpr_recognize_encodedimage(OPENALPR* instance, unsigned char* bytes, long long length, AlprCRegionOfInterest roi)
+OPENALPRC_DLL_EXPORT char* openalpr_recognize_encodedimage(OPENALPR* instance, unsigned char* bytes, long long length, AlprCRegionOfInterest roi)
 {
   std::vector<alpr::AlprRegionOfInterest> rois;
   alpr::AlprRegionOfInterest cpproi(roi.x, roi.y, roi.width, roi.height);
@@ -99,7 +99,7 @@ char* openalpr_recognize_encodedimage(OPENALPR* instance, unsigned char* bytes,
   return result_obj;
 }
 
-void openalpr_cleanup(OPENALPR* instance)
+OPENALPRC_DLL_EXPORT void openalpr_cleanup(OPENALPR* instance)
 {
   delete ((alpr::Alpr*) instance);
 }
\ No newline at end of file
diff --git a/src/bindings/c/alpr_c.h b/src/bindings/c/alpr_c.h
index a357488..0219732 100644
--- a/src/bindings/c/alpr_c.h
+++ b/src/bindings/c/alpr_c.h
@@ -22,7 +22,13 @@
 #define ALPR_C_H
 
 #ifdef __cplusplus
-extern "C" {
+extern "C" { 
+#endif
+
+#ifdef WIN32
+  #define OPENALPRC_DLL_EXPORT __declspec( dllexport )
+#else
+  #define OPENALPRC_DLL_EXPORT
 #endif
 
 typedef void OPENALPR;