save self-defined object to file?

[kenneth6]

if i define sth class called card, and further define sth class called deck based on card.

if i want to save such info into a txt/dat file, and then load the info back, how can i do that?

the file currently contains some info like in int/string type.

[gpraghuram]

if i define sth class called card, and further define sth class called deck based on card.

if i want to save such info into a txt/dat file, and then load the info back, how can i do that?

the file currently contains some info like in int/string type.

r u asking how to load the clss info from txt/dat file and create a class at run time?
or u want something else

Raghuram

[kenneth6]

r u asking how to load the clss info from txt/dat file and create a class at run time?
or u want something else

Raghuram

how to save & load the self-defined class object to and from the txt/dat file?

[gpraghuram]

how to save & load the self-defined class object to and from the txt/dat file?

i am still not clear?
R u saking how to read the object information froma test file...
You can use fread and fwrite like binary data to di the same.

raghuram

[kenneth6]

i am still not clear?
R u saking how to read the object information froma test file...
You can use fread and fwrite like binary data to di the same.

raghuram

because i am now using ifstream / ofstream to read / write int and string data to txt file, but not using the binary mode. should i be allowed to use binary mode ONLY to handle my class object data to read / write to txt file? if i change the mode to binary mode, will the current int and string data write / read be affected?

[weaknessforcats]

You cannot simply write out a string object sicne you don't know how it is implemented. You have to write out the contents of the strings as chars into your file.

As far as the ints go, conver them to chars and write them out.

When you read you cen reconstitute the int from the chars and ditto for the string.

Then you have to know the precise order that you used to write so you know how to read the data back.

You have to remember, that only the built-in types can be written to disc. All user-defined types have to be broken into built-in types for the write operation.

The difference between text an binary is simply whether the newline written to disc is part of the data (binary format) ar a delimiter (text format).