how to read hex value data from text file and store into array?
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So you basically want to just remove the first 15bytes of the line ?
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So basically:
QByteArray, fileContent = myFile.readAll(); memcpy(&hex[4], fileContent.data(), fileContent.size());
?
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i have open and read this file properly in c but for storing this data in array not get it any idea...
#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *f;
char c;
f=fopen("1.txt","r");
while((c=fgetc(f))!=EOF)
{
printf("%c",c);
}
fclose(f);
return 0;
} -
Read the file content in a QByteArray using QFile::readAll().
Then call split(',') on that byte array.
You will get a list of QByteArray like:["0x09","0xFF","0xD5","0x3C","0x06","0x7C","0x0A"...]
Now you can loop over all the elements of the list and call QByteArray::fromHex(...).toInt() to convert from hex to integer.
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ok for now i done till this.
my file is 1.txt, which contains simply this "1A,2C,0A"unsigned char temp[3]={0}
QByteArray bb("0x");
QByteArray aa;QString line;
QFile file1(filename);
if(file1.open(QIODevice::ReadOnly | QIODevice::Text)){
line=file1.readAll();
QStringList strings2 = line.split(QRegExp("\W+"), QString::SkipEmptyParts);
int n = strings2.size();for(x=0;x<n;x++){ qDebug() << strings2.at(x) << " "; aa = strings2.at(x).toLocal8Bit(); // at this aa =1A first loop, and so on. bb=bb.append(aa); // bb= 0x1A for first loop , and so on bb ="0x"; // initialise 'bb' /* * * in this portion is there any way i can save value of 'bb' to my unsigned char temp[ ]? *so that i can do something like temp[x]=bb ?? */ if(x==n) break; } }
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It is not really clear what you want: do you want to store a character represented by the hex value or the integer value?
So, how should temp look after you store bb there?
What is this supposed to do?bb=bb.append(aa); // bb= 0x1A for first loop , and so on bb ="0x";
you first assign a value and then overwrite it with "0x".
Why do you need 0x?In my previous post I already suggested how to convert hex string to integer.
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- I have a file with hex values saved as hex.txt which has
0x04,0x2C,0x64,0x00,0xB6,0x03,0xFA,0x84,0x87,0x6A,0x74,0x18,0x01,0x64,0x79,0x13,0x09,0x6A,0xCB,0xED,0x3D,0x9C,0x79,0x88,0x49,0x4A,0x2E,0xE8,0x89,0x24,0xF7,0xDD,0x04,0xA9,0x09,0xE7,0xE5,0x14,0xF7,0x5B,0xC5,0x49,0x38,0x10,0xFA,0x5C,0xFA,0x99,0xC4,0x0D,0x74,0xE0,0x3A,0x45,0xE8,0x64,0xCC,0xBB,0x72,0x57,0x31,0x63,0xF9,0x7F,0x46,0x48,0xF4,0xE8,0x91,0x5B,0xF8,0xED,0x07,0x9B,0x09,0x07,0x0D,0x64,0xF7,0x64,0xC7,0x5A,0xB8,0x17,0xCD,0xBC,0x6A,0xA9,0xC3,0x9D,0xEF,0x96,0x9D,0x62,0xF5,0xDD,0x83,0xD9,0x45,0x0F,0x99,0x4B,0xF6,0x63,0x41,0x29,0x38,0xE0,0x4A,0xCD,0xF9,0x94,0xC3,0x1D,0xAE,0xB8,0x96,0x3D,0x69,0x82,0x8C,0xFF,0x29,0xF9,0x2A,0xF6,0x85,0x50,0x45,0x1A,0x7E,0xF8,0x26,0x66,0x86,0x43,0x48,0x4B,0x3E,0xF9,0x96,0xD4,0x6A,0x33,0xC3,0x6B,0x75,0xFD,0x29,0x95,0xAA,0x27,0xC4,0xBD,0xF7,0x0F,0x99,0x1D,0xEB,0x9C,0x84,0xFB,0x7B,0xF8,0x4D,0x3A,0xFA,0x12,0x43,0xC9,0x43,0x0F,0x66,0x52,0xF7,0x6F,0x87,0x4A,0x36,0xE9,0xD5,0x84,0x8B,0x9A,0x8B,0xFF,0xC1,0x0F,0x2D,0x25,0x8B,0x99,0xCE,0xFE,0xC3,0xFF,0x0E,0xC9,0xF8,0x88,0x83,0xD9,0x83,0xD8,0x5D,0x91,0xF5,0x76,0xC7,0x3A,0xF8,0xE0,0x86,0x71,0xF7,0x7C,0x04,0x3A,0xFA,0xD8,0x95,0x69,0x4B,0x8F,0xC5,0xFA,0xFB,0xEF,0xBD,0x19,0xF6,0x05,0xC6,0xB8,0x7B,0x16,0xD5,0x71,0xF6,0x7D,0x46,0xD7,0xB7,0xC0,0xE5,0x11,0xF7,0x75,0x04,0x4A,0x3A,0xE1,0x72,0xD9,0x4B,0x96,0x89,0xFF,0xFF,0xDF,0x82,0xF2,0xF4,0x65,0x44,0x3B,0xB8,0xF0,0xF9,0xF9,0x43,0x50,0xC4,0x9D,0xFE,0x37,0x62,0xB8,0xA7,0x88,0x43,0xE9,0xC1,0xEF,0xB5,0x50,0xF7,0x87,0x85,0x17,0x40,0xE8,0x01,0x98,0x4A,0x86,0xC7,0xF7,0xFF,0x0F,0x31,0x38,0x4A,0x0B,0x44,0x38,0x7E,0xF8,0x59,0xE8,0x49,0x8B,0xC3,0xD9,0xFF,0xEF,0x72,0xE0,0x4A,0x0C,0xC7,0x29,0x3E,0xF8,0x45,0x33,0x7C,0x1B,0x02,0xDA,0x3F,0xF8,0xB1,0xF8,0x45,0x80,0x44,0x19,0xBE,0xE0,0xD6,0xC8,0x45,0x04,0xC3,0xF9,0x05,0x1F,0xA1,0x6B,0x7C,0x94,0xC3,0xF7,0xFB,0x0F,0xA3,0x2F,0x3F,0x11,0x27,0x42,0xF7,0x44,0x1F,0x65,0x62,0x52,0x42,0x4A,0x34,0x22,0x13,0x21,0x54,0x18,0x22,0x85,0xFF,0x43,0x32,0xB8,0xA5,0xF7,0xFF,0x12,0xF2,0x1F,0xC1,0x68,0x48,0x86,0x2F,0x22,0xF8,0x26,0x23,0xFF,0x0F,0xF6,0xFF,0x3F,0x77,0x45,0x1F,0x1F,0x17,0xF4,0x74,0x34,0x36,0x73,0x3F,0x26,0xF2,0x1F,0x6F,0x92,0x41,0xF7,0xFF,0x77,0xA6,0xF4,0x8F,0x4F,0xF4,0xF9,0x33,0x75,0x32,0xF4,0xF1,0xF8,0xF1,0x1F,0x8F,0x46,0x36,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xA2,0xE4
total is 498 bytes
2)Now I need to copy this 498 bytes values (same to same) to below array at a particular position starting from [8] to [498]
given the array in that array i want to store above text file data.....
unsigned char hex[508]={
0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; - I have a file with hex values saved as hex.txt which has
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temp[x]=static_cast<unsigned char>(QByteArray::fromHex(bb).toInt());
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@sachin786
Judging from your C code you don't have a text file at all but rather a binary file where the characters are saved. Assuming this is the case you read the data into a byte array (as already suggested) and just copy the relevant parts into a new byte array.QFile inputFile("myFileName.txt", QFile::ReadOnly); if (!inputFile.open()) ; //< Handle open errors here QByteArray binary = inputFile.readAll(); //< binary contains the file now unsigned char hex[508]; //< This is your array qint32 start = 4, size = 498; ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
If, on the other hand, you indeed have a text file as shown in the above post, then you read the text into a string (as already suggested yet again) and split by the comma separator. You then convert the resulting strings into one byte integers and copy them over to the new byte array.
QFile inputFile("myFileName.txt", QFile::ReadOnly | QFile::Text); if (!inputFile.open()) ; //< Handle open errors here QTextStream in(&inputFile); QString text = in.readAll(); //< text contains the file now QStringList bytes = text.split(','); //< Split the text into bytes QByteArray binary; //< Prepare the byte array binary.reserve(bytes.size()); bool ok = true; foreach (QString byte, bytes) { unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules if (!ok) ; //< Error while converting, handle accordingly binary.append(hexChar); //< Append the char to the byte array } // And finally, copy the data: unsigned char hex[508]; //< This is your array qint32 start = 4, size = 498; ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
EDIT: Alternatively the last snippet could be modified so you can save the data directly while converting:
QFile inputFile("myFileName.txt", QFile::ReadOnly | QFile::Text); if (!inputFile.open()) ; //< Handle open errors here QTextStream in(&inputFile); QString text = in.readAll(); //< text contains the file now QStringList bytes = text.split(','); //< Split the text into bytes bool ok = true; qint32 start = 4, size = 498; for (qint32 i = 0, bytesNumber = bytes.size(), offset = start; i < bytesNumber && i < size; i++, offset++) { unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules if (!ok) ; //< Error while converting, handle accordingly hex[offset] = hexChar; }
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@kshegunov thanks for reply...
#include "qtquick1applicationviewer.h"
#include <QApplication>
#include <QtCore>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);QtQuick1ApplicationViewer viewer; viewer.addImportPath(QLatin1String("modules")); viewer.setOrientation(QtQuick1ApplicationViewer::ScreenOrientationAuto); viewer.setMainQmlFile(QLatin1String("qrc:/main.qml")); viewer.showExpanded(); bool ok = true; QString filename="/home/anas/myQtApp/sachin2hex/hex.txt"; QFile inputFile(filename); QByteArray binary; //< Prepare the byte array QStringList bytes; int i=0; unsigned char hex[508]={0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,....position from[4] to [498] bytes data /// << same as mention above if(inputFile.open(QIODevice::ReadOnly | QIODevice::Text)){ QTextStream in(&inputFile); QString text = in.readAll(); //< text contains the file now bytes = text.split(','); qDebug() << "bytes :: " << bytes; binary.reserve(bytes.size()); foreach (QString byte, bytes) { unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules if (!ok) ; //< Error while converting, handle accordingly binary.append(hexChar); //< Append the char to the byte array } qint32 start = 4, size = 498; ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data } for(i=0;i<508;i++) printf("%c", hex[i]); return app.exec();
}
it print garbage for hex[ ]......
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it print garbage for hex[ ]......
What do you expect to be printed exactly? The data is binary so any of the elements that can't be displayed will be printed as gibberish ...
0x01
,0x00
are non-printable characters, so you'd see (depending on the platform) squares or other strange symbols, this doesn't necessarily mean the data is corrupted, only that it's interpreted in a erroneous way.