Null padded string

[RRRRSSSS]

I need to create a string padded if with 0x00 if length is not met.

sample

lenght = 30

input = 123456

should look like this in hex

0x 3132 3334 3536 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000  

or in "/" display

123456\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00

tried "format into string"  It either won't work for padding with 0x00 or I'm not formatting it correctly

[JÞB]

in 1000 words equivalent

[falkpl]

Why not start with a null padded string (init a u8 array to size 30 and convert to string) then replace the front of the string with replace string subset.

[JÞB]

Good Idea Paul!

[crossrulz · Accepted solution]

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@JÞB wrote:

Good Idea Paul!

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Very good idea.  Except, I would just use Replace Substring instread of converting to a byte array and back again.

[nathand]

One more suggestion (which I think is simpler than the above proposals): convert to a byte array, reshape the array, convert back to string. String to Byte Array, and vice versa, are free operations - they do not allocate memory buffers or make data copies.

EDIT: before someone points this out, yes, this only pads with nulls. If you need to pad with some other character, use on of the other suggestions.