Read/Write buffer. about memoryjs

[LiamKarlMitchell]

Note: I'm happy to implement this should I need it, will see how I go.

[RiftLurker]

Do I understand it correctly that this would allow me to read/write generic structs from and to memory just like the vector types?
If this is the case I would very much like to see this in a future version, as it's exactly what I'm gonna need for a project of mine.

[p410n3]

Yes. I think he already did it if I understood his email correctly.

[Rob--]

@LiamKarlMitchell to write generic structs to memory we could always just create a helper function inside the library?

// Method 1: the `value` arg contains the details (if struct data type varies):
const vector = [{
    type: memoryjs.FLOAT,
    data: 1.23,
}, {
    type: memoryjs.FLOAT,
    data: 4.56,
}, {
    type: memoryjs.INT,
    data: 420,
}];
memoryjs.writeMemory(handle, address, vector);

// Method 2: if struct data type doesn't vary:
const vector = [1.23, 4.56, 7.89];
memoryjs.writeMemory(handle, address, vector, memoryjs.FLOAT);

And inside writeMemory we do a check to see if the value is an object, in which case we know it's a struct and iterate over the array:

let offset = 0x0;
value.forEach(({ type, data }) => {
    memoryjs.writeMemory(handle, address + offset, data, type.toLowerCase());
    
    if (type === memoryjs.FLOAT) offset += 0x4;
    // etc, offset could be optionally defined by the `value` param
});

Another solution is to just use a library like node-struct and let people manually form an actual buffer themselves and then we can just write that to memory directly. I don't know too much about buffers so just let me know if I'm overthinking here or if there's a simpler solution!

[LiamKarlMitchell]

You could yes.

I've used concentrate and dissolve modules for a project in the past.
https://github.com/deoxxa/concentrate

Found it easier to add own/new data types to them.
Also made a script to turn .h struct into .js files which made it easy :)

[Rob--]

v.3.1.0: reading/writing of buffers added in c009eed

For information about writing or reading structures, refer to the generic structures section of the readme.

Functions added:
readBuffer(handle, address, size[, callback])
writeBuffer(handle, address, buffer)

@LiamKarlMitchell I've added a buffer read/write example here. Hopefully this is what you and @PostCrafter were looking for!

If you're happy to share your script here I'm sure others would find it useful :)

[LiamKarlMitchell]

Great stuff thanks @Rob--