How to replace a hex value in a file with other hex values using python script? -


i have hex values in file named hex_values.txt in format: 

0x52 0x49 0x46 0x46 0x62 0x9b 0x04 0x00 0x57 0x41 0x56 0x45 0x66  0x6d 0x74 0x20 0x10 0x00 0x00 0x00 0x01 0x00 0x01 0x00 0x40 0x1f  0x00 0x00 0x80 0x3e 0x00 0x00 0x02 0x00 0x10 0x00 0x64 0x61 0x74  0x61 0x3e 0x9b 0x04 0x00 0xe8 0x01 0xf9 0x01**

i want change first few values 0x00.

i have replace values 0xaa. copy contents of file1 file2 , replace values.

how can done?

note: file1 contains hexadecimal values.

i tried using:

file1 = open("hex_values.txt", "r"); #opening hex_values.txt file read1 = file1.read();  #copying content of hex_values.txt file2 file2 = open("file2.txt", "w"); file2.write(read1);  in range(0,10):          #ranging first 10 values          file2.seek(i)     file2.write('0x00')        #replacing hex value 0x00

am doing wrong?

problem facing is, contents of file1 being copied file2 not able replace values.

the solution expecting shown below:

0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x56 0x45 0x66 0x6d 0x74 0x20 0x10 0x00 0x00 0x00 0x01 0x00 0x01 0x00 0x40 0x1f 0x00 0x00 0x80 0x3e 0x00 0x00 0x02 0x00 0x10 0x00 0x64 0x61 0x74 0x61 0x3e 0x9b 0x04 0x00 0xe8 0x01 0xf9 0x01


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more