Add Google Test target for C API with complete Windows compatibility fixes including DLL export/import support

.github/workflows/build_and_test.yml

@@ -41,10 +41,14 @@ jobs:
         if: runner.os == 'Linux'
         working-directory: build
         shell: bash
-        run: ./notifly_unit_test
+        run: |
+          ./notifly_unit_test
+          ./notifly_c_gtest
 
       - name: Test on Windows
         if: runner.os == 'Windows'
         working-directory: build
         shell: pwsh
-        run: .\Release\notifly_unit_test.exe
+        run: |
+          .\Release\notifly_unit_test.exe
+          .\Release\notifly_c_gtest.exe

CMakeLists.txt

@@ -22,6 +22,7 @@ set_target_properties(${PROJECT_NAME}_c PROPERTIES
         OUTPUT_NAME "notifly_c"
         VERSION 1.0.0
         SOVERSION 1
+        DEFINE_SYMBOL "NOTIFLY_C_EXPORTS"
 )
 
 target_compile_features(${PROJECT_NAME}_c PUBLIC cxx_std_20)
@@ -52,7 +53,7 @@ set_target_properties(gtest_main PROPERTIES MSVC_RUNTIME_LIBRARY MultiThreaded$<
 
 # 'Unit_Tests_run' is the target name
 # 'UNIT_SOURCE' are source files with tests
-file(GLOB UNIT_SOURCE test/*.cpp test/*.h src/*.cpp include/*.h)
+file(GLOB UNIT_SOURCE test/unit_test.cpp test/unit_test.h src/*.cpp include/*.h)
 
 set(UNIT_TEST notifly_unit_test)
 add_executable(${UNIT_TEST} ${UNIT_SOURCE})
@@ -90,6 +91,22 @@ set_target_properties(${C_EXAMPLE}
         LINKER_LANGUAGE C
         )
 
+# C Interface Google Test
+set(C_GTEST notifly_c_gtest)
+add_executable(${C_GTEST} test/test_c_api_gtest.cpp)
+target_link_libraries(${C_GTEST} PRIVATE 
+        ${PROJECT_NAME}_c
+        ${CMAKE_THREAD_LIBS_INIT}
+        $<$<PLATFORM_ID:Linux>:dl>
+        gtest
+        gtest_main)
+target_include_directories(${C_GTEST} PRIVATE include)
+set_target_properties(${C_GTEST}
+        PROPERTIES
+        OUTPUT_NAME ${C_GTEST}
+        MSVC_RUNTIME_LIBRARY MultiThreaded$<$<CONFIG:Debug>:Debug>
+        )
+
 # Function to copy a file only if it does not exist or is different
 function(move_file source_file destination_dir)
         # Check if the source file exists

example/c_example.c

@@ -7,7 +7,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h> // for sleep
+#ifdef _WIN32
+#include <windows.h>
+#define usleep(x) Sleep((x)/1000)
+#else
+#include <unistd.h>
+#endif
 
 // Message IDs
 #define MSG_STARTUP 1001

include/notifly_c.h

@@ -26,6 +26,16 @@
 #ifndef NOTIFLY_C_H
 #define NOTIFLY_C_H
 
+#ifdef _WIN32
+    #ifdef NOTIFLY_C_EXPORTS
+        #define NOTIFLY_C_API __declspec(dllexport)
+    #else
+        #define NOTIFLY_C_API __declspec(dllimport)
+    #endif
+#else
+    #define NOTIFLY_C_API
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -52,21 +62,21 @@ typedef enum {
 #define NOTIFLY_C_VERSION_PATCH 0
 
 /* Instance management */
-notifly_handle notifly_create(void);
-void notifly_destroy(notifly_handle handle);
-notifly_handle notifly_default(void);
+NOTIFLY_C_API notifly_handle notifly_create(void);
+NOTIFLY_C_API void notifly_destroy(notifly_handle handle);
+NOTIFLY_C_API notifly_handle notifly_default(void);
 
 /* Observer management */
-int notifly_add_observer(notifly_handle handle, int notification_id, notifly_callback callback, void* user_data);
-int notifly_remove_observer(notifly_handle handle, int observer_id);
-int notifly_remove_all_observers(notifly_handle handle, int notification_id);
+NOTIFLY_C_API int notifly_add_observer(notifly_handle handle, int notification_id, notifly_callback callback, void* user_data);
+NOTIFLY_C_API int notifly_remove_observer(notifly_handle handle, int observer_id);
+NOTIFLY_C_API int notifly_remove_all_observers(notifly_handle handle, int notification_id);
 
 /* Notification posting */
-int notifly_post_notification(notifly_handle handle, int notification_id, void* data);
-int notifly_post_notification_async(notifly_handle handle, int notification_id, void* data);
+NOTIFLY_C_API int notifly_post_notification(notifly_handle handle, int notification_id, void* data);
+NOTIFLY_C_API int notifly_post_notification_async(notifly_handle handle, int notification_id, void* data);
 
 /* Utility functions */
-const char* notifly_result_to_string(int result);
+NOTIFLY_C_API const char* notifly_result_to_string(int result);
 
 #ifdef __cplusplus
 }