我有二进制格式的原始数据文件。虽然我在前面用MATLAB编写了代码,但我想将其转换成PYTHON。在
我附上了一些二进制文件。我基于文件格式规范文件读取这些文件的MATLAB代码如下:
f1 = fopen('p580.004','r')
if (f1 ~= -1)
must = fread(f1,1,'int16');
internaltrigger = fread(f1,1,'int8');
internaldwell = fread(f1,1,'int8');
dwellunits = fread(f1,1,'int8');
check_dwell(dwellunits==0)=2;
check_dwell(dwellunits==1)=0.002;
check_dwell(dwellunits==2)=0.000002;
check_dwell(dwellunits==3)=200;
check_dwell(dwellunits>3)=NaN;
check_dwell(dwellunits<0)=NaN;
acqmode = fread(f1,1,'int8');
formatdwell = fread(f1,1,'int32');
passlength = fread(f1,1,'int16');
passcount = fread(f1,1,'int32');
passpreset = fread(f1,1,'int32');
starttime = fread(f1,8,'*char');
startdate = fread(f1,8,'*char');
markerchannel = fread(f1,1,'int16');
mcsno = fread(f1,1,'int8');
calibtype = fread(f1,1,'int8');
calibunit = fread(f1,4,'*char');
calibcoef0 = fread(f1,4,'int8');
calibcoef1 = fread(f1,4,'int8');
externaldwelthrevolt = fread(f1,4,'int8');
reserv1 = fread(f1,1,'int32');
reserv2 = fread(f1,1,'int8');
replacethesum = fread(f1,1,'int8');
identbyte = fread(f1,1,'*char');
progdwethrevolt = fread(f1,1,'int8');
detdeslength = fread(f1,1,'int8');
detdes = fread(f1,63,'*char');
samplength = fread(f1,1,'int8');
sampledes = fread(f1,63,'*char');
lindisflag = fread(f1,1,'int8');
linscale = fread(f1,1,'int8');
disstarchannel = fread(f1,2,'int8');
disnumchannels = fread(f1,1,'int16');
reser = fread(f1,10,'int8');
discse = fread(f1,1,'int8');
discedg = fread(f1,1,'int8');
discvolt = fread(f1,4,'int8');
scaupvolt =fread(f1,1,'float32');
scalolvolt = fread(f1,1,'float32');
dwelltime = fread(f1,1,'float32');
setconsflag = fread(f1,1,'int8');
reserve = fread(f1,13,'int8');
calibcoef2 = fread(f1,1,'float32');
calibcoef3 = fread(f1,1,'float32');
mcsid = fread(f1,8,'*char');
if (dwelltime == check_dwell) && (length(startdate)>=2)
x1= fread(f1,1024,'int32'); % Photon Count
if (isempty(x1) ~= 1) && (length(x1) == 1024) && (length(find(x1>0))>100)
photoncount(1:1024) = x1;
else
photoncount(1:1024) = NaN;
end
%%%%%%% converting char array to string %%%%%
startdate=cell2mat(cellstr(startdate)');
starttime=cell2mat(cellstr(starttime)');
%%%%%%% checking for date format %%%%%
test=find(startdate == '-');
if (isempty(test) ~=1)
day2=startdate(1,4:5);
month2=startdate(1,1:2);
year2=pfiles1(i).date(8:11);
else
if (strcmp(startdate,'') ~=1)
day2=startdate(1,3:4);
month2=startdate(1,1:2);
year2=startdate(1,5:8);
else
day2='';
month2='';
year2='';
end
end
end
在PYTHON中,我编写了以下代码:
^{pr2}$pdata输出结果如下:
pdata =
Out[1]: array('B', [252, 255, 1, 0, 0, 1, 2, 0, 0, 0, 0, 4, 212, 48, 0, 0, 212, 48, 0, 0, 48, 48, 58, 49, 52, 58, 51, 54, 48, 57, 50, 57, 50, 48, 49, 56, 75, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 70, 179, 63, 0, 0, 0, 0, 0, 1, 170, 1, 7, 77, 67, 66, 32, 49, 50, 49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 225, 183, 15, 191, 255, 245, 31, 65, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 77, 67, 83, 112, 45, 48, 48, 49, 75, 0, 0, 0, 183, 0, 0, 0, 210, 0, 0, 0, 201, 0, 0, 0, 178, 0, 0, 0, 169, 0, 0, 0, 130, 0, 0, 0, 103, 0, 0, 0, 90, 0, 0, 0, 95, 0, 0, 0, 84, 0, 0, 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如果我使用以下Python代码:
with open(fname,'rb') as f: # b is important -> binary
fileContent = f.read()
现在,fileContent输出以十六进制格式给出输出。在
以下是我的疑问:
根据上述建议,我对准则进行了如下修订:
fname = 'p580.004'
with open(fname, 'rb') as fd:
binbuf = fd.read()
data_names = ('must','internaltrigger','internaldwell','dwellunits', \
'acqmode','formatdwell','passlength','passcount','passpreset', \
'starttime','startdate','markerchannel','mcsno','calibtype', \
'calibunit','calibcoef0','calibcoef1','externaldwelthrevolt', \
'reserv1','reserv2','replacethesum','identbyte', \
'progdwethrevolt','detdeslength','detdes','samplength', \
'sampledes','lindisflag','linscale','disstarchannel', \
'disnumchannels','reser','discse','discedg','discvolt', \
'scaupvolt','scalolvolt','dwelltime','setconstflag', \
'reserve','calibcoef2','calibcoef3','mcsid','Ncount')
data_tuple = struct.unpack_from('hbbbbihii8s8schbb4s4b4b4bibbcbb63pb63cbb2bh10bbb4bfffh13hff8c1024i', binbuf)
我面临的主要问题是定义二进制文件的格式。len(binbuf)和结构calcsize('hbbbbihii8s8schbb4s4b4b4bibbcbb63pb63cbb2bhb10bbb4bffh13hf8c1024i')。有人能告诉我我在基于上述MATLAB代码的格式中哪里出错了吗?在
我可以使用numpy编写PYTHON代码,如下所示:
这按要求很好。感谢大家的建议和最初的帮助。在
要将二进制数据读入python3中的变量,有一个
struct
模块。它允许指定如何通过格式字符串解释字节(例如无符号long、有符号字符等)以及以什么顺序解释。在例如,下面示例中对
struct.unpack_from()
调用中的格式字符串“hbb”表示:从二进制文件中读取前3个变量的快速示例:
或者,按照你的要求把它读入词典:
^{pr2}${关于这个^更多}
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