Error using qEndian

[Please_Help_me_D]

Hi,

I have the following situation.
I open QFile, then using memory mapping I read some bytes, reinterpret it as quint32 and change the Endianness. The problem is that I only can use qFromLittleEndian but when I change it to qFromBigEndian it gives me errors:

• readfile.obj:-1: error: LNK2019: unresolved external symbol "unsigned int * __cdecl qbswap<unsigned int *>(unsigned int *)" (??$qbswap@PEAI@@YAPEAIPEAI@Z) referenced in function "unsigned int * __cdecl qFromBigEndian<unsigned int *>(unsigned int *)" (??$qFromBigEndian@PEAI@@YAPEAIPEAI@Z)

• debug\ReadFile.exe:-1: error: LNK1120: 1 unresolved externals

My code is:

qFile = new QFile(myFile);
segySize = qFile->size();
quint32* memFile_quint32 = qFromBigEndian(reinterpret_cast<quint32*>(qFile->map(3600, qFile->size()-3600)));

If I change qFromBigEndian to qFromLittleEndian then I have no problems. But my file is in big endian :)
Does anybody know what it maight be?
I use Windows 10 x64, MSVC x64, Qt 5.14.0

[kshegunov]

Ehm, apply to each data field, not on an array. Something like:

quint32 * src = reinterpret_cast<quint32*>(qFile->map(3600, qFile->size()-3600));

constexpr size_t elements = 3600 / sizeof(quint32);
quint32 memFile_quint32[elements] ;

for (size_t i = 0; i < elements; i++)
    memFile_quint32[i] = qFromBigEndian(src[i]);

[Please_Help_me_D]

@kshegunov thank you!
But why it works if use qFromLittleEndian?
Is that beacause my computer native is little endian?

[kshegunov]

@Please_Help_me_D said in Error using qEndian:

Is that beacause my computer native is little endian?

Yes.