? ? ? ?寫程序時要想下各種可能出錯的情況，提前給出錯誤提示，項目大了就可以比較容易找錯誤。

比如，當特征點個數小于4時不能計算單應矩陣，所以當個數小于4時先輸出提示：

if (matchePoints.size()>10)for (int i = 0; i<11; i++){imagePoints1.push_back(keypoints1[matchePoints[i].Idx1].pt);imagePoints2.push_back(keypoints2[matchePoints[i].Idx2].pt);}else if (matchePoints.size() > 4 )for (int i = 0; i < matchePoints.size(); i++){imagePoints1.push_back(keypoints1[matchePoints[i].Idx1].pt);imagePoints2.push_back(keypoints2[matchePoints[i].Idx2].pt);}else{cout << "特征點個數小于4" << endl;exit(1);}

再比如，動態申請指針指向的內存空間時，有可能出現內存申請不成功的情況，所以每次申請完都先判斷是否申請成功：

double* wid = (double*)malloc((num+1) *sizeof(double));//存儲每個矩形的寬 if (wid == NULL) { cout << "Fail to allocate memory to wid" << endl; exit(1); }

總結

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