[英]Writing binary files in python to be read by C
I have to use a program written in C that read data from a binary file in this way 我必须使用用C编写的程序,以这种方式从二进制文件中读取数据
nCnt = 0;
for (i=0;i<h.nsph;++i) {
fread(&gp,sizeof(struct gas_particle),1,fp);
if (bGas) {
kd->p[nCnt].iOrder = nCnt;
for (j=0;j<3;++j) kd->p[nCnt].r[j] = gp.pos[j];
++nCnt;
}
}
The above code is not the whole code of the program I'm using but only the part relevant for my question. 上面的代码不是我正在使用的程序的整个代码,而只是与我的问题相关的部分。 I need to read the positions of
nCnt
particles, ie the coordinate for each particle. 我需要读取
nCnt
粒子的位置,即每个粒子的坐标。 I have these positions in a python array, which looks like this 我在python数组中有这些位置,看起来像这样
pos=array([[[ 0.4786236 , 0.49046784, 0.48877147],
[ 0.47862025, 0.49042325, 0.48877267],
[ 0.47862737, 0.49039413, 0.4887735 ],
...,
[ 0.4785084 , 0.49032556, 0.48860968],
[ 0.47849332, 0.49041115, 0.48877266],
[ 0.47849161, 0.49041022, 0.48877176]]])
How should I write this array in a binary file so that the C code would read it fine? 我应该如何在二进制文件中编写此数组,以便C代码可以正常读取?
Use the python module array
and it's tofile() method to write the data in a format which C can read or the IO routines if you use numpy . 使用python模块
array
,它的tofile()方法以C可以读取的格式写入数据, 如果使用numpy 则以 IO例程写入数据。
With the number of digits, the 'f'
format (float) should work. 使用数字位数,
'f'
格式(浮点数)应该有效。
In C, you can read each line like so: 在C中,您可以像这样读取每一行:
float values[3];
fread( values, sizeof( float ), 3, fh );
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