我有一个文本文件，内容是：
# Details for object 1 ("PASperson")
# Center point -- not available in other PASCAL databases -- refers
# to person head center
Original label for object 1 "PASperson" : "UprightPerson"
Center point on object 1 "PASperson" (X, Y) : (281, 169)
Bounding box for object 1 "PASperson" (Xmin, Ymin) - (Xmax, Ymax) : (250, 151) - (299, 294)
# Details for object 2 ("PASperson")
# Center point -- not available in other PASCAL databases -- refers
# to person head center
Original label for object 2 "PASperson" : "UprightPerson"
Center point on object 2 "PASperson" (X, Y) : (247, 373)
Bounding box for object 2 "PASperson" (Xmin, Ymin) - (Xmax, Ymax) : (215, 354) - (274, 466)
现在我想获得Xmin Ymin Xmax Ymax值，并在我的c ++程序中使用它来将这些坐标与我新生成的坐标进行比较。那么如何做到这一点。我可以从文本文件中获取字符串“ Xmax，Ymax”，但是在此之后我不知道如何读取以获取坐标。我的代码是要搜索字符串是：
int main()
{
std::string data;
ifstream read_file("crop001501.txt",ios::in);
char *search="Xmax, Ymax";
int offset;
while(std::getline(read_file ,data))
{
//read_file>>data;
//cout<<data<<endl;
if ((offset = data.find(search, 0)) != string::npos) {
cout << "found '" << search << endl;}
}
cin.get();
return 0;
}
该程序将在每行中搜索字符串Xmax，Ymax，并在找到后立即进行打印。但我想要此字符串的指针，以便我可以增加指针值并读取Xmin的值，然后跳过，并读取Ymin的值，然后跳过）-并读取Xmax的值，对于Ymax相同。获得价值后，转到下一行并执行相同的操作。如果有人知道任何其他读取这些值的方法，请告诉我，我不需要X，Y的值。如果有任何错误，对不起，我是新来的。提前致谢
#include <iostream>
#include <string>
#include <regex>
#include <cassert>
#include <chrono>
#include <sstream>
using namespace std;
int main(void){
string line("Bounding box for object 1 \"PASperson\" (Xmin, Ymin) - (Xmax, Ymax) : (250, 151) - (299, 294)");
// METHOD 1 - using regular expressions
{
regex e("object ([[:digit:]]+) \"PASperson\" \\(Xmin, Ymin\\) - \\(Xmax, Ymax\\) : \\(([[:d:]]+), ([[:d:]]+)\\) - \\(([[:d:]]+), ([[:d:]]+)\\)");
smatch m;
bool found = regex_search(line, m, e);
if (found == true){
assert(m.size() == 6);
int object_id, xmin, xmax, ymin, ymax;
object_id = stoi(m[1]);
xmin = stoi(m[2]);
ymin = stoi(m[3]);
xmax = stoi(m[4]);
ymax = stoi(m[5]);
cout << "Object ID = " << object_id << endl;
cout << "Xmin = " << xmin << endl;
cout << "Ymin = " << ymin << endl;
cout << "Xmax = " << xmax << endl;
cout << "Ymax = " << ymax << endl;
}
}
// METHOD 2 : using stringstream
{
istringstream ss(line);
int object_id;
string xmin_s, xmax_s, ymin_s, ymax_s;
string other;
ss >> other; ss >> other; ss >> other; ss >> other; // ignore 4 words
ss >> object_id;
ss >> other; ss >> other; ss >> other; ss >> other; ss >> other; ss >> other; ss >> other; // ignore 7 words
ss >> xmin_s; ss >> ymin_s;
ss >> other; // ignore -
ss >> xmax_s; ss >> ymax_s;
// get rid of leading/trailing symbols (,)
xmin_s.erase(xmin_s.begin()); xmin_s.erase(xmin_s.end() - 1);
xmax_s.erase(xmax_s.begin()); xmax_s.erase(xmax_s.end() - 1);
ymin_s.erase(ymin_s.end() - 1);
ymax_s.erase(ymax_s.end() - 1);
int xmin, xmax, ymin, ymax;
// convert strings to integers
xmin = stoi(xmin_s);
ymin = stoi(ymin_s);
xmax = stoi(xmax_s);
ymax = stoi(ymax_s);
cout << "Object ID = " << object_id << endl;
cout << "Xmin = " << xmin << endl;
cout << "Ymin = " << ymin << endl;
cout << "Xmax = " << xmax << endl;
cout << "Ymax = " << ymax << endl;
}
}
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