[C win32] Patching several bytes at once

Hi,
i'm very new to programmation and i want to know more on patching:
how can i retrieve a string of opcode from an edit and patch a file with em ?
For instance i have offset 0x3f3c and retrieve 0x908e from the edit; so i want to apply 0x90 at offset 0x3f3c
and so 0x8e at offset 3f3d
How to do such a thing ?

Thanks.

 

Yes thank you woot332 but i already know it. I don't want a patcher i want to know HOW to do it...
I've already done a patecher but it can only patch a byte at a time and i want several...

 

Still thanks for trying to help woot332 but that still not what i was searching thoough it is interesting...
i'll past a part of code if it can help:
<code>
FILE *f=0;
f=fopen(filePathName,"r+");//filePathName is retrieved by GetOpenFileName()
fseek(f,getOffset,SEEK_SET);//getOffset is retrieved by GetWindowText() as it is an edit
fprintf(f,"%c",getOpcode);//then i retrieved the patch code (getOpcode) and patch
fclose(f);
</code>
the problem here: if we have several offset to patch it would be boring to do it one by one...
thanks for helping

 

yes, i've already tried it but the prog goes crash