C# :: Reading A File Into A Byte Array?

Jun 25, 2014

I basically want to create a save editor application that will enable people to alter various values in the save by clicking on releveant buttons and then also for the editor to auto update the checksum when changes are done.

The save file is in hex so from what I can gather I would need to create a button to open the file using 'open file dialogue' and then read the file into a byte array so that the values can be called at any time when a particular butto is pressed and the application will then seek to the point in the file to make the required changes.

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C# :: Get Posted File From Byte Array

Oct 7, 2014

I have an application that has its own embedded web server. I am trying to add jQuery/Ajax file upload capabilities to the application however, I am running into issues getting the posted file. The jQuery/Ajax portion is similar to this method here. Due to the way the webserver was written (its in a dll and I do not have access to the source), the posted file comes in as a byte[]. If I try to save the byte array directly to file using:

File.WriteAllBytes("path", ByteArray)

I end up with a corrupt file that I cannot open. I believe this is because the byte array also contains the posted file header info (Content-Disposition, name, filename, etc.). If I view the contents of the byte array using:

System.Text.Encoding.Default.GetString(ByteArray)
the header info can be viewed as:
------WebKitFormBoundaryQfPjgEVpjoWgA5JL
Content-Disposition: form-data; name="0"; filename="someimage.png"
Content-Type: image/png
‰PNG

Based on the selected file size and the size of the byte array, the entire file is in the byte array. How can I go about extracting and saving the posted file from the byte array?

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C# :: Reading Byte From Serial Ports

Jun 8, 2014

how to use this function:

ftStatus = myFtdiDevice.Read(readData, numBytesAvailable,ref numBytesRead);

to read byte from the serial port.This function is part of the DLL that came with the chip(FT2232D) I am using on my board.I want to use the function to read a byte from the serial port and then send the value to the Graphic user interface.Unfortunately I was unable to get the expected value on my GUI.If I send for instance 40,what I get on the GUI are letters instead of the number 40 or at times the GUI will not even respond.Below are my lines of code I used to read the byte from the serial port:

The following instructions are executed whenever the CHECKBOX is checked

private
void checkBox1_CheckedChanged(object sender, EventArgs e)
{
UInt32 numBytesRead = 0;

[Code].....

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Visual C++ :: Reading Into Array / 2d Array From Mixed Text File?

Jan 18, 2014

I know to read a strings into array and tables.. what is they are mixed up?? strings are just names ( 3 characters) and there are bunch of table.. the max size was set to 60

ex. text file

JES
DAN
JEN
.
.
.
01010101
10010101
RAM
JET
01010010
10100101
.... and so on

should i use a while loop?

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C/C++ :: Separate Byte Of Array Into Nibble For New Array

Oct 1, 2012

How can I separate byte array and put nibbles in a new array?

when I try following:

byte in[]={0xab,0x11,0x22,0x33,0xbb};
byte out[10];
void seperatebyte(byte* input, byte* output) {
  for(int i = 0;i<sizeof(input);i++) {
        output[i*2]  = (input[i] >> 4) & 0xf;
        output[(i*2)+1]  = input[i] & 0xf;
     }
}

seperatebyte(in,out); //gives output of

10 11 1 1 184 1 184 0 0 0

I expect 10 11 1 1 2 2 3 3 11 11

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C++ :: Byte Array To Double Conversion?

Dec 5, 2014

I'm trying to understand why a conversion from a byte array (unsigned char) to a double works when done one way and not antoher.

In the example code I test by hard coding an unsigned char array of the same bytes that the double consists of.

When I copy the bytes to a long long and cast to double the result is not the original double but if I use a struct the bytes can be set and the conversion happens.

Seems to me that both ways should work. I'd just like to know what is going on with the "struct way" that makes the conversion correct. I see in debugger that the bytes in memory are the same for piAsLong and u.bytes.

My compiler is VS 2012 and a long long and double are both 8 bytes (tested with sizeof). This is learning activity only.

Code:
#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;
union {
double d;

[code]....

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C++ :: Convert 2-byte Array To Short Int?

Nov 18, 2012

I'm having trouble reading a block of bytes into a vector of short ints. My code is as follows:

Code:
FileStream.seekg(2821);
vector<short> g_Data;
int iter = 0;
g_Data.reserve(maxNumOfInts);

[Code] ....

The relevant block of data starts at offset 2821 in the file. Every two bytes are a signed short integer. What's odd is that it's giving me the correct results only part of the time. At offset 1052421 and 1052422 there are two bytes 40 and 1F that are correctly read in as 8000, but at offset 1052415 and 1052416 bytes 88 and 13 are read in as -120 instead of 5000.

I don't see anything wrong with my code, though, unless I'm misunderstanding completely how to convert an array of two bytes into a single float. Is my method correct? Better still, is there some way to just convert en mass an array of bytes into a vector of signed short ints?

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C++ :: Encoding Byte Array Data?

Apr 23, 2012

I'm trying to parse some binary data in the form of an array of bytes and I've come across something that is confusing me related to the representation of data as chars versus ints. It's a bit of a long story, but the byte array contains a mixture of character data and integer data which I' having trouble unravelling. The problem seems to arise from the issue below:

Code:
const char * ch_arr = "abcd";
const unsigned int * ui_arr = (const unsigned int*)ch_arr;
cout << ui_arr[0] << endl;
unsigned int ui = 'a';
ui = ui << 8;
ui |= 'b';
ui = ui << 8;
ui |= 'c';
ui = ui << 8;
ui |= 'd';
cout << ui << endl;

I expected both the output lines to be the same, since they contain the same bytes (I believe), but I get:

Code:
1684234849
1633837924

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C :: Writing Array Into File And Reading Array From File

Apr 20, 2014

i've been trying to write array into file and read them into the same program again, but the output is all wrong.

Code:

#include<stdio.h>
int main()
{
FILE *fp;
char name[3][7];
int x;
}

[code]....

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C/C++ :: Reading A File Into Array Then Reversing The Array

Jan 19, 2015

This is what I am supposed to be doing with this problem: Read the integer values in the file "numbers.dat" and display

* them in reverse order (that is, display the last number in the
* file first, the second-to-last second and so on). Use an array to
* store the values. It is safe to assume that the file contains no
* more than 100 values.

I have gotten far enough to read the file and display as an array, but it is displaying vertically rather than horizontally. So it is displaying 10 and a 1 on the first line then the 0 on the second line. Before I can work the reverse part out, I need it to display each number as 10 line 1 -235 line 2 so on and so forth.

This is my code so far:

void display_array_reversed() {
ifstream fin ("numbers.dat");
if (!fin){
cerr << "Error opening file" << endl;
exit(1);

[Code] .....

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C# :: Store Each Char Of A String Into Byte-array?

Apr 25, 2014

I am trying to store each char of a string(string a ="1100") into a byteArray ( byte[] byteArray = new byte[4]. its not showing any error but its storing like below:

byteArray[0] = 49
byteArray[1] = 49
byteArray[2] = 48
byteArray[3] = 48

and what i want is

byteArray[0] = 1
byteArray[1] = 1
byteArray[2] = 0
byteArray[3] = 0

I don't know why but its replacing 1 with 49 and 0 with 48.what am I doing wrong or how to do this?

my code is as below

byte[] byteArray = new byte[4];)/>
int binArrayAdd = 0;
string a ="1100";
foreach (char Character in a)
{
byteArray [binArrayAdd] = Convert.ToByte(Character);
binArrayAdd++;
}

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C Sharp :: Byte Array To Char Conversion

Jul 26, 2012

- API Function

TestSend(ref char data, ref int len, char slot);
---------------------------------------------------
Byte[] IccSelect = new Byte[7]{
                              0x00,
                              0xA4,    // INS
                              0x04,    //1                              0x00,    //2                              0x0E,
                              0x31,
                              0x50,
                              };
Int32 len = 20;

TestSend(ref ??, ref len, '0');//byte array to char conversion

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C Sharp :: How To Extract A String From Byte Array

Feb 11, 2014

i need to search for a keyword in a binary(.raw)file and have to extract the characters(until a '&' character is found)that immediately following the keyword .

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C Sharp :: Write Byte Array To Textboxes?

Jan 22, 2015

In my application there is a structure that holds 200 parameters for 200 tests. These structure is converted to byte array . I want to write this byte array to a file in save button and when I click open button, this file must open and write these bytes to corresponding text boxes. How it possible.?

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Visual C++ :: How To Convert PNG Image Into Byte Array

Mar 12, 2013

I m loading a png image by using the ATLImage library.

CImage Image;
Image.Load (L"D:ImagesPNG_ImagesImage7.png");

how to retrieve the byte array value of this png image. I tried retrieving it as

byte *png = reinterpret_cast<BYTE *>(Image.GetBits());

but when i access the data , der is a loss of data while converting it in the above manner.

I found a snippet in net for decoding the raw data . but der is a line is the code which is unknown to me. The code is as follows :

CImage atlImage;
HMODULE hMod = GetModuleHandle(NULL);
atlImage.Load(bstr);
void* pPixel = atlImage.GetBits();
intpitch = atlImage.GetPitch();
intdepth = atlImage.GetBPP();

[Code] ....

How do I get the byte * value form the png image loaded?

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Visual C++ :: Draw Image Using 2D Byte Array?

Feb 8, 2013

I like to Draw an Image Using two dimensional byte array[512][256].

I used SetPixelV method to plot the image.

But Its very slow & hidden some buttons(Controls) at run time in the same dialog.

For reference i send some code,

Code:
for(row = 0; row <512; row ++)
{
for(col = 0; col < 256; col++)
{
Data[row][col] = y;
SetPixelV(d, 10+row, 10+col, RGB(Data[row][col],Data[row][col],Data[row][col]));
}
}

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C++ :: Variable To Byte Array Converter Class?

Aug 18, 2012

I've been working on making a class that makes turning any variable or object into a byte array and vice-versa, quick with minimal pointer interface.

As well as a function for turning any variable or object into a binary text string.

Code:
#include <iostream>
#include <bitset>
#include <sstream>
// Convert a Variable to a Byte Array
template <class var>
unsigned char* VarToBytes(var &data) {

[code].....

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C++ :: Storing A String In Byte-array Form?

Jun 6, 2012

I am trying to use C# with C++, two different applications that work together.

In C# it is easy to get a byte array out of a string, by just using Encoding.Default.GetBytes(of-this-string);

I can pass bytes to my C++ program by just writing in the embedded resources. But this won't allow strings, as far as I know it can only be a byte array. C++ reads the embedded resources a LPBYTE.

So I try to send the string or message in byteform.

However the problem in C++ is that there is no Encoding.Default.GetString(xxx)

Would there be any other ways to send a message/sentence in bytearrayform and request it in C++ back to the original string?

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C++ :: Binary IO - Read 4 Byte Int From A File

Feb 26, 2012

Trying to write very simple code to read a 4 byte int from a file.

code:

int tester;
FILE *fp;
fp=fopen("/home/bdluser/skeleton.blx","rb");
fread(&tester,sizeof(int),1,fp);
printf("tested 1 byte read should be 1: %i",tester);

I have tried editing the binary file....it outputs similar large numbers

00000000000000000000000000000001 outputs 808464432
0x00000001 outputs 808482864
0x10000000 outputs 808548400
10000000000000000000000000000000 outputs 808464433
x01x00x00x00 outputs 813183068
x00x00x00x01 outputs 813183068 same....

etc.etc. It just keeps returning the same large integers. I thought they were memory addresses but its consistent output/input so I guess not.

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C :: Reading From A File And 2D Array?

Apr 25, 2013

So if I have a file that has a list of scores and the name of the student, how am I going to read the scores and names, and print to output? For example, the text file will look like:

83 75 89 90 75 67 John Doe
67 92 78 64 88 95 Jane Waters
76 65 87 70 97 76 Billy Bob

And they'll be printed like that too.

I made a 2D array for the scores and names, and was able to scan the scores into the scoreArray, but I am stuck for the names. Do I use fscanf, fgets, etc? And how do I use these for a char array?

insert Code:
int main {
int scoreArray[NUM_ROW][NUM_COLUMN];
char nameArray[NUM_ROW][SIZE];
...........opened file, etc.

[ for (row=0; row<2; row++)
{ if(row>0)
{printf("

[Code] ....

When I run this, I get the scores and names (somewhat) in a jumbled mess.....

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C++ :: Reading In TXT File To 2D Array?

Mar 27, 2013

My assignment is to read in from a .txt file two things: an integer and a string. After reading in these 2 items I have to put them into a 10x10 2D array so that both the number and the character can be manipulated by the user. Here are the contents of the text file:

Dr. J's Garden
0.21,B, 2.80,G, 4.96,B, 2.66,B, 4.48,B, 0.61,T, 0.40,B, 3.50,G, 3.63,B, 3.91,T,
2.33,T, 4.51,G, 1.15,G, 4.95,T, 2.76,T, 4.51,T, 2.54,G, 4.04,T, 2.38,B, 0.62,B,
4.54,G, 3.38,T, 1.57,T, 3.92,T, 3.03,B, 4.72,G, 0.23,B, 4.02,G, 4.69,G, 0.66,G,
1.34,T, 2.21,G, 2.48,G, 4.85,T, 3.25,G, 3.55,G, 4.78,B, 0.81,G, 0.74,G, 2.55,G,
3.35,G, 4.52,G, 4.81,G, 2.67,G, 4.97,B, 0.87,G, 1.28,G, 4.58,B, 1.91,B, 3.69,B,
3.02,T, 3.15,T, 1.08,T, 4.68,G, 1.10,B, 3.17,G, 1.97,T, 0.99,G, 4.50,T, 3.87,T,
3.36,G, 1.60,T, 3.73,G, 2.14,B, 3.68,B, 2.44,G, 3.10,G, 4.54,B, 0.25,B, 0.25,G,
1.79,B, 3.02,G, 2.21,T, 0.22,G, 3.67,B, 4.46,G, 2.14,G, 2.31,G, 0.80,T, 3.83,B,
1.56,B, 1.41,T, 0.80,G, 1.27,T, 0.08,B, 1.20,G, 2.88,B, 2.78,T, 3.30,B, 1.75,B,
2.60,G, 4.72,T, 4.55,T, 0.89,B, 0.52,B, 2.06,T, 0.28,G, 4.36,T, 4.41,G, 0.36,B,

One number and one character need to be assigned to each element of the array. I know exactly how to fill a 2D array when it's just numbers, but the characters and the commas are giving me a lot of trouble.

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C++ :: Reading File Into Array?

May 10, 2012

i'm reading a file which has 20 rows and random number of columns, i want to put them in array/vector which i did but the problem is that array is filling a cell with a garbage value at location where i don't have a value in the data file.

suppose i have data file like following (there is tab between each column and each row has different number of columns)

Code:
20 30 10
22 10 9 3 40
60 4
30 200 90
33 320 22
here is my code

Code:
#include <vector>
#include <iostream>
#include <fstream>

[Code]....

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C# :: Create Byte Array From IntPtr Without Copying Data

Apr 18, 2012

let's say I have an IntPtr that points to the raw data of System.Drawing.Bitmap. is there any way to create a byte array from that IntPtr without copying the data? I'm a pretty experienced C++ programmer, so I can call ToPointer() on it and convert to a byte* to work with it as a pointer, which is no big deal for me, but using a pointer and doing pointer arithmetic increases the risk of bugs, so I'd prefer not to do it that way if there's another way.

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C/C++ :: How To Convert Byte Array With Hex Number To Equivalent Decimal Value

Sep 18, 2012

I tried to convert byte array with hex to equivalent decimal value as follows but it gives me unexpected results:

byte hex_arr[] = { 0x00, 0x01, 0xab, 0x90};
unsigned long i=0;
i = hex_arr[3] + (hex_arr[2] << 8) + (hex_arr[1] << 16) + (hex_arr[0] << 24);
the output is 4294945680
Correct output should be 109456

but when I try with byte hex_arr[]={0x00,0x00,0x0f,0xff};

it gives correct out put 4095

the correct output works until the hex values is {0x00,0x00,0x7f,0xff}

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C++ :: Reading A File Into Array Of Struct

Nov 20, 2014

Code:
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
struct inventory

[Code]...

This is my program output Enter the file name : "filename".txt ..... (Nothing shows up)

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C :: Reading A File Into Array Of Pointers?

Mar 24, 2013

why when I print out "array[2]" nothing prints? It just prints blank space. My file definitely has text in it, but when I try to assign "text" into the array of pointers it won't show any text. I know fgets() appends a newline at the end of the string, not sure if that has anything to do with it, but I've tried printing everything that should be in "array" with a for loop and I get nothing.

Code:
#include <stdio.h>
#define FILEPATH "/home/user/Desktop/text"
int main(){
FILE *myFile = fopen(FILEPATH, "r");
if(myFile == NULL) return 0;
char text[100];
char *array[100];
int idx = 0;
while(fgets(text, 100, myFile)){
array[idx++] = text;
}
puts(array[2]);
}

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