How to encrypt string and write to txt

Ok so based on the example from this link  
 (https://www.cryptopp.com/wiki/Advanced_Encryption_Standard),    i have 
tried encrypting a "plain" string into a "cipher" string and writing that 
"cipher" string to a .txt file in one program, and in another program 
afterwards reading that same .txt file into a string and decrypting it. But 
when i cout that "recovered" string, it is just  random characters and not 
my original "plain" string. I think the problem starts when i attempt to 
get the "cipher" string in the .txt file, but not sure. Any help is greatly 
appreciated. Thanks in advance.

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