I have a very basic question here. I tried googling for a while, because there are a lot of similar questions but none of the solutions worked for me.
here is a code snippet that shows the problem:
QString test = "hello";
unsigned char* test1 = (unsigned char*) test.data();
unsigned char test2[10];
memcpy(test2,test1,test.size());
std::cout<<test2;
I try to fit the QString into the unsigned char array but the output I get is always just 'h'.
Can anyone tell me what is going wrong here?
Problem is in that QString.data()
returns a QChar*
but you want const char*
QString test = "hello";
unsigned char test2[10];
memcpy( test2, test.toStdString().c_str() ,test.size());
test2[5] = 0;
qDebug() << (char*)test2;
^^^
this is necessary becuase otherwise
just address is printed, i.e. @0x7fff8d2d0b20
The assignment
unsigned char* test1 = (unsigned char*) test.data();
and trying to copy
unsigned char test2[10];
memcpy(test2,test1,test.size());
is wrong, because QChar
is 16 bit entity and as such trying to copy it will terminate because of 0 byte just after 'h'
.