從文件中讀取CVPoint

Question

我有興趣從文件中讀取CvPoint *類型的點，但我嘗試過標準符號（x，y）。當我嘗試驗證輸出時，它會給出錯誤的值。在文件中讀取CvPoint的格式是什麼？

point.txt

(1,1) 

的main.cpp

points = (CvPoint*)malloc(length*sizeof(CvPoint*)); 
points1 = (CvPoint*)malloc(length*sizeof(CvPoint*)); 
points2 = (CvPoint*)malloc(length*sizeof(CvPoint*)); 
fp = fopen(points.txt, "r"); 
fscanf(fp, "%d", &(length)); 
printf("%d \n", length); 
i = 1; 
while(i <= length) 
{ 
    fscanf(fp, "%d", &(points[i].x)); 
    fscanf(fp, "%d", &(points[i].y)); 
    printf("%d %d \n",points[i].x, points[i].y); 
    i++; 
} 

它打印：

1 


12 0 

Answer 1

下面是使用相同的格式爲文本文件不同的方法：

#include <iostream> 
#include <fstream> 
#include <opencv2/core/core.hpp> 

using namespace std; 
using namespace cv; 

int main(int argc, char* argv[]) { 
    ifstream file("points.txt"); 
    string line; 
    size_t start, end; 
    Point2f point; 
    while (getline(file, line)) { 
     start = line.find_first_of("("); 
    end = line.find_first_of(","); 
    point.x = atoi(line.substr(start + 1, end).c_str()); 
    start = end; 
    end = line.find_first_of(")"); 
    point.y = atoi(line.substr(start + 1, end - 1).c_str()); 
    cout << "x, y: " << point.x << ", " << point.y << endl; 
    } 
    return 0; 
}