QByteArray to char*, sending with libcurl

I'm having trouble with saving a QPixmap to QByteArray, then writing it to char*. For example i'm trying to write to a file with ofstream.

                 QByteArray bytes;
                 QBuffer buff(&bytes);
                 buff.open(QIODevice::ReadOnly);
                 pixmap.save(&buff, "PNG");

                 QString str(bytes);

                 char *data;
                 data =  (char*)qstrdup(str.toAscii().constData());

                ofstream myfile;
                 myfile.open ("test.jpg");
                   myfile << data;
开发者_运维百科                   myfile.close();

But all i get in that file is:

‰PNG

The reason i need a char* , is because i'm having some permission problems when writing to disk, then sending with libcurl. I want to load it to a char* , then send it directly from memory.

You encounter a null-byte. You'll need something like write(), because the << operator doesn't allow you to tell how long the string is and stops writing at the first null byte:

const QByteArray array = str.toAscii();
myfile.write(array.constData(), array.size());

Solved the problem using this:

 memcpy(data,bytes.constData(),bytes.size()+1);

Should have tried that at least.

Not directly related, but is there any reason you use libcurl instead of the integrated QNetworkAccessManager?

you may use strdup(). This method is doing this

char *strdup (const char *s) {
    char *d = malloc (strlen (s) + 1);   // Space for length plus nul
    if (d == NULL) return NULL;          // No memory
    strcpy (d,s);                        // Copy the characters
    return d;                            // Return the new string
}

more info here: strdup() - what does it do in C?

so that you get a char*, whereas ConstData() will return a const char*