Read double precision numbers from binary file
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Franck D'Araujo
on 4 Mar 2015
Commented: Franck D'Araujo
on 5 Mar 2015
Hello,
I have to read double precision numbers from a binary file. I'm used to do that in C, which basically looks like that for a LSB first coded file :
char *cAddress = NULL;
double value = 0;
cAddress = (char*)(value);
*cAddress = ucBuffer[uiOffset];
*(cAddress + 1) = ucBuffer[uiOffset + 1];
*(cAddress + 2) = ucBuffer[uiOffset + 2];
*(cAddress + 3) = ucBuffer[uiOffset + 3];
*(cAddress + 4) = ucBuffer[uiOffset + 4];
*(cAddress + 5) = ucBuffer[uiOffset + 5];
*(cAddress + 6) = ucBuffer[uiOffset + 6];
*(cAddress + 7) = ucBuffer[uiOffset + 7];
Now, I would like to implement that in Matlab. Do you have any idea on how I should proceed ?
Thanks a lot for supporting
Franck
0 Comments
Accepted Answer
James Tursa
on 4 Mar 2015
Edited: James Tursa
on 4 Mar 2015
Did you mean to type the following:
cAddress = (char*)(&value); // Added the & for type punning
Otherwise, the method of getting the bytes into the double isn't apparent. In any event, you should be able to simply use fopen with the proper machinefmt option, followed by fread with the '*double' option. Are doubles the only thing(s) in the file?
3 Comments
James Tursa
on 4 Mar 2015
... the code most likely crashes."
I don't even think it will compile. I would be surprised if a compiler let you convert a double value directly into a pointer.
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