打开txt文件，c++提取开头为Set point的行，整行输出到新的txt文件中。

Question

Language="VBSCRIPT" Sub CATMain() Set partDocument1 = CATIA.ActiveDocument Set part1 = partDocument1.Part Set bodies1 = part1.Bodies Set body1 = bodies1.Item("零件几何体") Set sketches1

PHP中文网 · Answer

#include 
#include 

int main()
{
    std::ifstream infile("in.txt");
    std::ofstream outfile("out.txt");
    std::string str;
    while (std::getline(infile, str)) {
        if (str.find("Set point") == 0)
            outfile << str << std::endl;
    }
    infile.close();
    outfile.close();
}

According to the requirements to be changed, it can be made as follows, for reference only:

#include 
#include 
#include 
#include 

void input_filter(const char *input_file, const char *output_file, const char *mode) {
    using namespace std;
    ifstream infile(input_file);
    ofstream outfile(output_file);
    string str;
    while (getline(infile, str)) {
        if (str.find(mode) == 0)
            outfile << str << endl;
    }
    infile.close();
    outfile.close();
}

int main()
{
    input_filter("in.txt", "out_set_point.txt", "Set point");
    input_filter("in.txt", "out_set_reference.txt", "Set reference");
    input_filter("in.txt", "out_set_line.txt", "Set line");
    input_filter("in.txt", "out_point.txt", "point");
}

If you think it is not convenient enough, you can also write the beginning string to be extracted into a mode.txt, read in.txt and mode.txt respectively, and the output file name can be called out_**.txt. The output file name cannot contain illegal characters such as spaces and can be filtered out in advance.

打开txt文件，c++提取开头为Set point的行，整行输出到新的txt文件中。

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