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How to read / write a struct in Binary Files?（2个答案）
1年前关闭。
我在将一个包含“许多变量”的结构体写入二进制文件（作为临时文件）以便在其他模型中（当需要时）以相同的结构体格式（structpreprocessing_variables）读取时遇到了一些困难
我的struct如下：

struct preprocessing_variables{
    parameters params;
    obj_prop objprop;
    griddf grid;
    vector<time_t long long> timevec;
    landmask lmdomain;
    data3D w1_array;
    data3D w2_array;
    data3D w3_array;
    vector<int> orientation;
    position pos;
    cross_wind crosswind;
}

子结构：

struct parameters {
  int N, radius, t_sum, obj;
  double  dt;
  string t0;
  float lon0, lat0, lonn, latn,x0, y0, dl;
};
struct landmask {
    vector<vector<double>> value;
};
struct data3D {
    vector<vector<vector<double>>> u;
    vector<vector<vector<double>>> v;
};
struct position{
    vector<float> x;
    vector<float> y;
};
...

我想把它们都写进一个二进制文件里。我所做的是一种笨重，有一些代码错误。我也想简化这段代码。请给予个忙！我会很感激的。

void save_preprocessing(preprocessing_variables prevars){
    const char* filename="preprocessing.data";
    FILE *outfile;
    if(outfile= fopen(filename,"wb")) fclose(outfile);
    remove(filename);
    outfile= fopen(filename,"wb");
    fwrite(&prevars.params,sizeof(prevars.params),1,outfile);
    fwrite(&prevars.objprop,sizeof(prevars.objprop),1,outfile);
    fwrite(&prevars.grid,sizeof(prevars.grid),prevars.grid.lat.size(),outfile);
    fwrite(&prevars.timevec,sizeof(prevars.timevec),prevars.timevec.size(),outfile); 
    fwrite(&prevars.lmdomain,sizeof(prevars.lmdomain),prevars.lmdomain.value.size(),outfile);
   fwrite(&prevars.w1_array,sizeof(prevars.w1_array),prevars.w1_array.u.size(),outfile);
...
fwrite(&prevars.orientation,sizeof(prevars.orientation),prevars.orientation.size(),outfile);
    fwrite(&prevars.pos,sizeof(prevars.pos),prevars.pos.x.size(),outfile);
    fwrite(&prevars.crosswind,sizeof(prevars.crosswind),1,outfile);
    
    fclose(outfile);
}