ROM Hack How do you make a Save Editor?

[Newedge_Isaiah]

I know there are hundreds of posts about asking this same question, but none seem to have the answers I'm looking for. Before you ask, yes I have knowledge of coding in C#, but mainly Visual Studio (.NET) coding. The goal of my save editor is not to replace hex values, rather strings inside of a .bin save file. Everywhere I have looked has no answers to this certain code, so I would appreciate any help.

So for example, I would like to click a button, and allow the already selected save file to change the values of a row of bytes to different values. I know how to hex, so yeah.

For even more example, I would like for a value at these offsets (all on one line) in a .bin file
656 - 65B (6 bytes long)

To be changed to a certain value written in string (text).

Any idea how I would do this?

 

[Queno138]

I know there are hundreds of posts about asking this same question, but none seem to have the answers I'm looking for. Before you ask, yes I have knowledge of coding in C#, but mainly Visual Studio (.NET) coding. The goal of my save editor is not to replace hex values, rather strings inside of a .bin save file. Everywhere I have looked has no answers to this certain code, so I would appreciate any help.

So for example, I would like to click a button, and allow the already selected save file to change the values of a row of bytes to different values. I know how to hex, so yeah.

For even more example, I would like for a value at these offsets (all on one line) in a .bin file
656 - 65B (6 bytes long)

To be changed to a certain value written in string (text).

Any idea how I would do this?

Just convert the string to bytes, and overwrite that location?

(And I've made a save editor and other programs using Visual Studios .NET implementation)

 

[Newedge_Isaiah]

Do you have an example code format?

 

[Agent Moose]

I created my Project Mirai save editor all with Python (this was the first ever time I learned Python). My command line one is simple and straight forward, while the Python GUI one is much more compressed.

With python I used this to change a range of bytes:

if sys.argv[2] == "UnlockProfileOptions":
    for ProfileCard in range(0, 846):
        rawr.seek(0x7BB4 + ProfileCard)
        rawr.write('\x01')
    print 'All Profile Card Options Unlocked!'

The "range(0, 846)" just makes that snippet of code loop, as well as adds that number to address 0x7BB4 then writes 0x01 to the address it's currently on.

So for your example, in python it would look like this:

if sys.argv[2] == "argument":
    for variable in range(0, 6):
        rawr.seek(0x656 + variable)
        rawr.write('\x01')
    print 'RAWR'

I am not familiar with C#, so I don't know what the equivalent would be without looking it up.

I hope this helps a little bit.