Add error codes

Author: Kirill Kornyakov

sample_template/application.cpp

@@ -37,7 +37,7 @@ int Application::processFrame(const Mat& src, Mat& dst)
     return 0;
 }
 
-int Application::show(const std::string &caption, const Mat& src, const Mat& dst)
+int Application::showFrame(const std::string &caption, const Mat& src, const Mat& dst)
 {
     if (src.rows != dst.rows || src.cols != dst.cols)
     {

sample_template/application.hpp

@@ -16,7 +16,8 @@ class Application
 
     int getFrame(const std::string &fileName, cv::Mat& src);
     int processFrame(const cv::Mat& src, cv::Mat& dst);
-    int show(const std::string &caption, const cv::Mat& src, const cv::Mat& dst);
+    int showFrame(const std::string &caption, const cv::Mat& src, const cv::Mat& dst);
+
  private:
     Processing processor;
 };

sample_template/main.cpp

@@ -6,6 +6,13 @@
 using namespace std;
 using namespace cv;
 
+enum ErrorCode {
+    OK,
+    WRONG_ARGUMENTS,
+    WRONG_INPUT,
+    CANT_PROCESS
+};
+
 int main(int argc, const char **argv)
 {
     Application app;
@@ -15,27 +22,26 @@ int main(int argc, const char **argv)
     {
         cout << "practice2 <image_name>" << endl;
         cout << "<image_name> - image name for filtering" << endl;
-        return 1;
+        return WRONG_ARGUMENTS;
     }
 
     Mat src;
     if (app.getFrame(params.imgFileName, src) != 0)
     {
         cout << "Error: \'src\' image is null or empty!" << endl;
-        return 2;
+        return WRONG_INPUT;
     }
 
     Mat dst;
     if (app.processFrame(src, dst) != 0)
     {
         cout << "Error: Filtering failed!" << endl;
-        return 3;
+        return CANT_PROCESS;
     }
 
-    const std::string caption = "OpenCV Sample";
     char key = 0;
     while(key != 27) // Esc
-        key = app.show(caption, src, dst);
+        key = app.showFrame("OpenCV Sample", src, dst);
 
-	return 0;
+	return OK;
 }