转载:程序猿的杂货店

1 将图片转为QByteArray传输   

QBuffer buffer;     

buffer.open(QIODevice::ReadWrite);//pixmap不能为空，必须先将图片加载到pixmap中       

pixmap.save(&buffer,"jpg");       

QByteArray pixArray;       

pixArray.append(buffer.data());

2 将QByteArray转为图片显示     

QByteArray array;     

while(client->waitForReadyRead(100))

{         

array.append((QByteArray)client->readAll());     

}     

QBuffer buffer(&array);     

buffer.open(QIODevice::ReadOnly);     

QImageReader reader(&buffer,"JPG");     

QImage img = reader.read();     

if(!img.isNull()){         

QPixmap pix = QPixmap::fromImage(img);         

ui->showImageLabel->setPixmap(pix.scaled(ui->showImageLabel->size(),Qt::KeepAspectRatio,Qt::SmoothTransformation));

}