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.

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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());

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Solved the problem using this:

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

Should have tried that at least.

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

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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*