diff --git a/.gitignore b/.gitignore
index 496ee2c..aaab5ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-.DS_Store
\ No newline at end of file
+.DS_Store
+build/
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..844c9ba
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.15.2 FATAL_ERROR)
+
+project(GMT_API_EX VERSION 0.1.0 LANGUAGES CXX)
+
+include_directories("/usr/local/include/gmt")
+find_library(${GMT_LIB} gmt "/usr/local/lib")
+
+macro(add_example name file)
+	add_executable(${name} ${file}.cpp)
+	target_link_libraries(${name} PUBLIC ${GMT_LIB})
+endmacro()
+
+add_example(ex1 example1/gridding)
\ No newline at end of file
diff --git a/example1/compile.sh b/example1/compile.sh
index 466f541..d0a0586 100755
--- a/example1/compile.sh
+++ b/example1/compile.sh
@@ -3,4 +3,4 @@
 inc=`gmt-config --cflags`
 lib=`gmt-config --libs`
 g++ gridding.cpp $inc $lib -o gridding
-./gridding
\ No newline at end of file
+#./gridding
\ No newline at end of file
diff --git a/example1/gmt.history b/example1/gmt.history
new file mode 100644
index 0000000..3d58eae
--- /dev/null
+++ b/example1/gmt.history
@@ -0,0 +1,4 @@
+# GMT 6 Session common arguments shelf
+BEGIN GMT 6.1.1
+R	0/1000/0/1000
+END
diff --git a/example1/gridding b/example1/gridding
index 48d50a8..17ae623 100755
Binary files a/example1/gridding and b/example1/gridding differ
diff --git a/example1/gridding.cpp b/example1/gridding.cpp
index ab0950a..2bdf858 100644
--- a/example1/gridding.cpp
+++ b/example1/gridding.cpp
@@ -4,42 +4,43 @@
 
 int main(int argc, char *argv[])
 {
+	std::string table_name = "table.txt";
+	std::string grid_name = "table.nc";
+
 	// Initiate a new GMT session
 	void *API = GMT_Create_Session("gridding_example", 2U, 0, NULL);
 
 	// Read table file from disk
 	struct GMT_DATASET *D = reinterpret_cast<GMT_DATASET*>(
-		GMT_Read_Data (API, GMT_IS_DATASET, GMT_IS_FILE, GMT_IS_PLP, 
-			GMT_READ_NORMAL, NULL, "table.txt", NULL));
+		GMT_Read_Data (API, GMT_IS_DATASET, GMT_IS_FILE, GMT_IS_PLP, GMT_READ_NORMAL, NULL, table_name.c_str(), NULL));
 
 	// load dataset to a virtual file for gridding
-	// data type of a GMT virtual file must be GMT_STR16
-	char table_file[GMT_STR16] = {""};
-	GMT_Open_VirtualFile(API, GMT_IS_DATASET, GMT_IS_PLP, GMT_IN, D, table_file);
+	// length of a GMT virtual file's name must be GMT_VF_LEN
+	char table_vir_file[GMT_VF_LEN] = {""};
+	GMT_Open_VirtualFile(API, GMT_IS_DATASET, GMT_IS_PLP, GMT_IN, D, table_vir_file);
 
 	// create a virtual file to hold result
-	char grid_file[GMT_STR16] = {""};
-	GMT_Open_VirtualFile(API, GMT_IS_GRID, GMT_IS_SURFACE, GMT_OUT, NULL, grid_file);
+	char grid_vir_file[GMT_VF_LEN] = {""};
+	GMT_Open_VirtualFile(API, GMT_IS_GRID, GMT_IS_SURFACE, GMT_OUT, NULL, grid_vir_file);
 
 	// prepare CMD arguments for the gridding module
-	std::string table_file_str = table_file;
-	std::string grid_file_str = grid_file;
-	std::string args_gridding = "-R0/1000/0/1000 -I10 -D1 -St0.3 " + 
-		table_file_str + " -G" + grid_file_str;
+	std::string table_vir_file_str = table_vir_file;
+	std::string grid_vir_file_str = grid_vir_file;
+	std::string args_gridding = "-R0/1000/0/1000 -I10 -D1 -St0.3 " + table_vir_file_str + " -G" + grid_vir_file_str;
 	// call the greenspline module for gridding
 	GMT_Call_Module(API, "greenspline", GMT_MODULE_CMD, (char*) args_gridding.c_str());
 
 	// get grid file from the virtual file for outputting
 	struct GMT_GRID *G = reinterpret_cast<GMT_GRID*>(
-		GMT_Read_VirtualFile(API, grid_file));
+		GMT_Read_VirtualFile(API, grid_vir_file));
 
 	// write the grid to file
 	GMT_Write_Data(API, GMT_IS_GRID, GMT_IS_FILE, GMT_IS_SURFACE, GMT_READ_NORMAL, NULL,
-		"table.nc", G);
+		grid_name.c_str(), G);
 
 	// close virtual files
-	GMT_Close_VirtualFile (API, table_file);
-	GMT_Close_VirtualFile (API, grid_file);
+	GMT_Close_VirtualFile (API, table_vir_file);
+	GMT_Close_VirtualFile (API, grid_vir_file);
 
 	// end the GMT session
 	GMT_Destroy_Session(API);
diff --git a/example1/table.nc b/example1/table.nc
new file mode 100644
index 0000000..23b0c29
Binary files /dev/null and b/example1/table.nc differ