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?
View 3 Replies
ADVERTISEMENT
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]));
}
}
View 14 Replies
View Related
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?
View 5 Replies
View Related
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}
View 8 Replies
View Related
Feb 19, 2013
In short I'm converting a floating point bilinear image resampling routine into one that only uses fixed point arithmetic. I've gotten rid of nearly all the floats now, in fact all but one and the results at the moment are in distinguishable from the floating point version. It's a maths issue really. Some pseudocode goes like this.
Code:
for( int xx=0; xx<ow; xx++ ) {
int_center = (ccx >> 16);
int temp = xx * 2;
for (j = int_center; j <= int_center + 1; j++)
[Code] ....
Where ccx is and integer error accumulator that gives me a scaled integer. Shifting down buy 16 gives me the relative pixel I need to be working on. The line just after where the inner loop begins is where I have the last remaining float. FILTER_FACTOR is essentially a percentage by which I scale the error accumulator to the correct amount.
For example.
ccx = 98303. Which is a value of 1.5 when shited down by 16 bits. Obviously I can shift it because it will round and I lose the precision. Lets say FILTER_FACTOR is 39321. Which is 60% of 1 (65535) So what I'd like to know is, is it possible to use the FILTER_FACTOR as an integer and do some fancy integer math to scale the result from (ccx - (j<<16)) by the representative amount that is FILTER_FACTOR. In this example 60%. Effectively getting 40% of (ccx - (j<<16)) At the moment FILTER_FACTOR is still a float and therefore 0.6, which of course works just fine.
View 4 Replies
View Related
Feb 5, 2015
I am working on a program which turns a 256 color bmp image to a txt file of a array of 0-255. I wrote this:
#include<iostream>
#include<fstream>
// if 1 , see bmp file header info
#if 1
#define SEE_INFO
#endif
using namespace std;
[Code] ....
Something weird happened. When I use it on simple.bmp (Attachment), it works fine. But when I use it on flower.bmp , it just give me zeros.
Attached File(s)
simple.bmp (3.39K)
simple.txt (8.47K)
flower.bmp (76.05K)
flower.txt (150.49K)
View 3 Replies
View Related
Mar 12, 2013
In my project I'm using PVOID pointer to store real time data. After getting this data I will convert the data into byte array, like below
Code:
byte *bPoint = NULL;
PVOID pvData;
byte TempArr[1024];
bPoint = (byte*) pvData;
for(int i=0;i<1024;i++)
TempArr[i] = (byte) (*bPoint + i);
Processing time for the above code takes 9500 to 9900 microseconds (Used QueryPerformanceCounter).
Code:
TempArr[0] = ((BYTE*) pvData) [0];
This code takes 1100 to 1200 microseconds. My doubt is, The processing time of PVOID data into byte array conversion takes time like above? Or any other easy way(PVOID data into byte array conversion) to reduce the processing time?
View 14 Replies
View Related
Aug 31, 2012
protected void btnUpload_Click(object sender, EventArgs e){
string pic = ASCIIEncoding.ASCII.GetString(fileUpload1.FileBytes);
TextBox1.Text = value.ToString();
//Here i get pic[40385]
[Code] ....
On two different event i get two different value which cause file not open due to file corrupted
View 1 Replies
View Related
Mar 11, 2014
My requirement is,
Read *.bmp image and displaying bitmap image with scrollbar in a MFC dialog application.
I was done using this
I was read the *.bmp image as a pixel data and stored by 2D Array,
Now i want to Display this 2D array as bitmap image with scrollbar separately in the same dialog. How can i display bitmap with scrollbar using 2D array?
View 10 Replies
View Related
Jul 3, 2014
Im trying to compare the image of a button to another image in Visual Studio like so...
//variables
Image active = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\active.png");
Image stunned = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\stunned.png");
[Code]...
btnStatusPlr1.Image SHOULD come back as True.Then I realized it might not be the same as setting the buttons image in the properties (Which is what i did to get the original image (the one being compared to))
I do have a feeling ive done something wrong here (Yes im a noob /> )
Variable active, is the same image as the buttons default (Well should be)
View 1 Replies
View Related
May 15, 2013
I want to convert image to number.
View 12 Replies
View Related
Dec 26, 2013
I am writing a program where I need to read a byte of char data and convert it into a text string of binary data that represents the hex value...
i.e. The char byte is 0x42 so I need a string that has 01000010 in it. I've written the following subroutine....
------------- My Subroutine ----------------------------------------------------------------------
void charbytetostring(char input, char *output){
int i, remainder;
char BASE=0x2;
int DIGITS=8;
char digitsArray[3] = "01";
[Code] ....
When I submitted the byte 0x42 to the subroutine, the subroutine returned to the output variable 01000010... Life is good.
The next byte that came in was 0x91. When I submit this to the subroutine I get garbage out.
I am using a debugger and stepped through the subroutine a line at a time. When I feed it 0x42 I get what I expect for all variables at all points in the execution.
When I submit 0x91 When the line remainder = input % BASE; gets executed the remainder variable gets set to 0xFFFF (I expected 1). Also, when the next line gets executed..
input = input / BASE; I get C9 where I expected to get 48.
My question is, are there data limits on what can be used with the mod (%) operator? Or am I doing something more fundamentally incorrect?
View 6 Replies
View Related
Sep 7, 2014
I'm looking to convert audio, images, video to base64 in c++, and through many searches on the web I've only seem to come up with string > base64.
When I view a .mp3 file for example, there are many characters there that are not available to be used in my string to encode.
[URL] ....
I have this code set up in my project, and all I want is to be able to give the location of any file and have it encode (could just encode to a string, I can handle writing it to a file), and then give a location to put the decoded file as well.
I'm not sure exactly where to even start.
View 6 Replies
View Related
Apr 29, 2015
Using C . I have been tasked (for a University assignment) to create a program that will enable a user to upload an image and convert that image into ASCII text using SDL on a Linux system. I've managed to open a window, display an image (non-selected) and convert it into grayscale using
case SDLK_g:
for (int y = 0; y < image->h; y++) {
for (int x = 0; x < image->w; x++) {
Uint32 pixel = pixels[y * image->w + x];
Uint8 r = pixel >> 16 & 0xFF;
Uint8 g = pixel >> 8 & 0xFF;
Uint8 b = pixel & 0xFF;
Uint8 v = (0.212671*r)+(0.715160*g)+(0.072169*B)/>;
pixel = (0xFF << 24) | (v << 16) | (v << 8) | v;
pixels[y * image->w + x] = pixel;
I am absolutely clueless as to how I can get the user to upload an image to the program and then begin the image -> ASCII conversion. I've found seem to be written in C++ or C# to make the conversion I should be using the GetPixelColour command?
View 14 Replies
View Related
Feb 7, 2014
I've been having this odd problem when I write a file byte by byte, when I write a byte (dec)10 it adds a (dec)13 in front of it, and as far as I can tell, this is the only byte value that does this.
and most annoyingly, I can't read that (dec)13 with fstream, the only reason I know it's adds it, is because I used an external hex editor.
here is the code that causes the problem:
Code:
#include <fstream>
using namespace std;
int main()
{
[Code]...
but the output file reads '0D 0A' (that's in hex, '13 10' in decimal) when viewed in a hex editor. no other number (that I've tried) adds that extra 13.
View 2 Replies
View Related
Feb 26, 2013
I need to send a packet of type byte:
0x00, 0x01, 0x02, 0x11, 0x00, 0x00
to a device via the serial port and then I receive and store data coming from device like this:
0x01, 0x01, 0x01 , 0x00, 0x00, 0x00, 0x01, 0x00, 0x04, 0x01, 0x00.
Writing lines of code through which:
1) I create the array
2) the sending the array to serial port
3) I'll see what I'm sending
4) I get the data
I'm using Visual Studio 2010 and C + + or VC++ language.
View 14 Replies
View Related
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
View 2 Replies
View Related
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.
View 3 Replies
View Related
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?
View 2 Replies
View Related
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]....
View 6 Replies
View Related
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
View 4 Replies
View Related
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++;
}
View 4 Replies
View Related
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
View 1 Replies
View Related
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 .
View 1 Replies
View Related
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.?
View 1 Replies
View Related
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].....
View 2 Replies
View Related
