Problem while Writing data into and Reading data ifrom a text file

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vikas
vikas 2012-4-27
I desperately need some help on this issue I am trying to perform Encryption and Decryption operation using a particular technique. The code is working perfectly. However i
am facing this problem; Once encryption process is performed the encrypted data is written into a file as shown below:
id=fopen('C:\Users\HOME\Desktop\I.txt','w');
fwrite(id,final);
fclose(id);
FINAL is an array of ASCII characters in the range 1 to 256
and this is what i got as an answer for FINAL= xcpucmmucpxcfmc|ppxdpucpxcba
The file I.txt should have contained the same thing but it contained: xcpucmm€ucpxcfmc|ppxdpucpxcba
In the DECRYPTION part i read the file this way:
fid=fopen('C:\Users\HOME\Desktop\I.txt','r');
f=fscanf(dfid,'%c');
fclose(fid);
I proceded by using f (which contains the cipher text) in the decryption process only to get a wrong plaintext.
When i removed all the above codes and simply copied the ciphertext variable FINAL into the variable f in the decryption
process, i got the correct answer i.e
f=final;
My requirement is that both encryption and decryption process must use a text file.
Kindly Help Me !!

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回答（1 个）

Walter Roberson
Walter Roberson 2012-4-27
If you use fwrite() to write the file, you should probably use fread() to read the file.
Question: is "final" an array of characters in the range 1 to 256, or in the range 0 to 255? The 256 would give you problems.

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