How to make QFile read the whole line

ManiRon

@JonB Actually my requirement is to calculate checksum for the data and store it in the same file where the data i am writing to . So i planned to write the checksum at the begining and followed by the data.

Now when i start the application i will validate the file by reading the checksum stored in file and compare it with the remaining data in file by calculating checksum for them .

Note the stored checksum is calculated using the data and not the whole file

VRonin

could you replace fileData = file.read(size_of_file); with :

fileData.resize(size_of_file);
const auto actualRead = file.read(fileData.data(),size_of_file);
Q_ASSERT(actualRead==size_of_file);

ManiRon

@VRonin said in How to make QFile read the whole line:

actualRead

I tried sir but i am getting this kind of error

jsulm

@ManiRon It's not hard to fix:

const qint64 actualRead = file.read(fileData.data(),size_of_file);

ManiRon

@jsulm said in How to make QFile read the whole line:

const qint64 actualRead

error resolved

ManiRon

@VRonin but thsi doest read the full data

ManiRon

@JonB

No sir i checked the read by removing the NUL from the data in the file and i was able to see that it read the whole data and qDebug() was displaying the full data

This is the whole data when i removed the NUL : " WQA.,?E>t1?dWQA.,DE_??n1?d7be1526df618c0c4d1bab3959adb65ada9f20bd969493e532a7861d29bc6e698{TB.)?V1??n1?dS[H21?z7_??n1?d340819615bcd7cb87459cac37070456eb0af53716c1f0064c4771857728d3777 "

ManiRon

@ManiRon

But when the data conatins NUL the data will be " WQA.,?E>t1?dWQA.,DE_??n1?d7be1526df618c0c4d1bab3959adb65ada9f20bd969493e532a7861d29bc6e698 "

jsulm

@ManiRon said in How to make QFile read the whole line:

but thsi doest read the full data

What is the output of

qDebug() << actualRead << size_of_file;

?

ManiRon

@jsulm said in How to make QFile read the whole line:

size_of_file

Size = 194 .

I thought it was qdebug problem so i wrote the data read from the file to another file then also it remains the same as the data shown in the debug

VRonin

What is the value of actualRead?

ManiRon

@VRonin

Size = 194

VRonin

That means the read doesn't actually stop with the null

ManiRon

This post is deleted!

ManiRon

@VRonin

Yes you are right sir, So what can we do ?

JonB

@ManiRon
"What can we do" about what? You've spent the whole time claiming the read stops at the NUL, now you confirm it does not, so what's the problem?