Back to the previous coding way (using the macro with the goto).

modules/highgui/src/cap_ximea.cpp

@@ -62,95 +62,75 @@ void CvCaptureCAM_XIMEA::init()
 // Initialize camera input
 bool CvCaptureCAM_XIMEA::open( int wIndex )
 {
-    bool res = true;
+#define HandleXiResult(res) if (res!=XI_OK)  goto error;
+
     int mvret = XI_OK;
 
-    if(0 == numDevices)
+    if(numDevices == 0)
+        return false;
+
+    if((mvret = xiOpenDevice( wIndex, &hmv)) != XI_OK)
     {
-        res = false;
+        errMsg("Open XI_DEVICE failed", mvret);
+        return false;
     }
-    else if(XI_OK != (mvret = xiOpenDevice(wIndex, &hmv)))
+
+    int width   = 0;
+    int height  = 0;
+    int isColor = 0;
+
+    // always use auto exposure/gain
+    mvret = xiSetParamInt( hmv, XI_PRM_AEAG, 1);
+    HandleXiResult(mvret);
+
+    mvret = xiGetParamInt( hmv, XI_PRM_WIDTH, &width);
+    HandleXiResult(mvret);
+
+    mvret = xiGetParamInt( hmv, XI_PRM_HEIGHT, &height);
+    HandleXiResult(mvret);
+
+    mvret = xiGetParamInt(hmv, XI_PRM_IMAGE_IS_COLOR, &isColor);
+    HandleXiResult(mvret);
+
+    if(isColor) // for color cameras
     {
-        errMsg("Open XI_DEVICE failed", mvret);
-        res = false;
+        // default image format RGB24
+        mvret = xiSetParamInt( hmv, XI_PRM_IMAGE_DATA_FORMAT, XI_RGB24);
+        HandleXiResult(mvret);
+
+        // always use auto white balance for color cameras
+        mvret = xiSetParamInt( hmv, XI_PRM_AUTO_WB, 1);
+        HandleXiResult(mvret);
+
+        // allocate frame buffer for RGB24 image
+        frame = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 3);
     }
-    else
+    else // for mono cameras
     {
-        int width   = 0;
-        int height  = 0;
-        int isColor = 0;
+        // default image format MONO8
+        mvret = xiSetParamInt( hmv, XI_PRM_IMAGE_DATA_FORMAT, XI_MONO8);
+        HandleXiResult(mvret);
 
-        // always use auto exposure/gain
-        if(XI_OK != (mvret = xiSetParamInt(hmv, XI_PRM_AEAG, 1)))
-        {
-            res = false;
-        }
-        else if(XI_OK != (mvret = xiGetParamInt(hmv, XI_PRM_WIDTH, &width)))
-        {
-            res = false;
-        }
-        else if(XI_OK != (mvret = xiGetParamInt(hmv, XI_PRM_HEIGHT, &height)))
-        {
-            res = false;
-        }
-        else if(XI_OK != (mvret = xiGetParamInt(hmv, XI_PRM_IMAGE_IS_COLOR, &isColor)))
-        {
-            res = false;
-        }
-        else
-        {
-            if(isColor) // for color cameras
-            {
-                // default image format RGB24
-                if(XI_OK != (mvret = xiSetParamInt(hmv, XI_PRM_IMAGE_DATA_FORMAT, XI_RGB24)))
-                {
-                    res = false;
-                }
-                // always use auto white ballance for color cameras
-                else if(XI_OK != (mvret = xiSetParamInt(hmv, XI_PRM_AUTO_WB, 1)))
-                {
-                    res = false;
-                }
-                else
-                {
-                    // allocate frame buffer for RGB24 image
-                    frame = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 3);
-                }
-            }
-            else // for mono cameras
-            {
-                // default image format MONO8
-                if(XI_OK != (mvret = xiSetParamInt(hmv, XI_PRM_IMAGE_DATA_FORMAT, XI_MONO8)))
-                {
-                    res = false;
-                }
-                else
-                {
-                    // allocate frame buffer for MONO8 image
-                    frame = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
-                }
-            }
-        }
+        // allocate frame buffer for MONO8 image
+        frame = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
+    }
 
-        if(true == res)
-        {
-            //default capture timeout 10s
-            timeout = 10000;
-
-            if(XI_OK != (mvret = xiStartAcquisition(hmv)))
-            {
-                errMsg("StartAcquisition XI_DEVICE failed", mvret);
-                res = false;
-            }
-        }
-        else
-        {
-            errMsg("Open XI_DEVICE failed", mvret);
-            xiCloseDevice(hmv);
-            hmv = NULL;
-        }
+    //default capture timeout 10s
+    timeout = 10000;
+
+    mvret = xiStartAcquisition(hmv);
+    if(mvret != XI_OK)
+    {
+        errMsg("StartAcquisition XI_DEVICE failed", mvret);
+        goto error;
     }
     return true;
+
+error:
+    errMsg("Open XI_DEVICE failed", mvret);
+    xiCloseDevice(hmv);
+    hmv = NULL;
+    return false;
 }
 
 /**********************************************************************************/