qt实现读取多个共享内存0x7001,0x7002,0x7003,0x7004,0x7005中的图片
时间: 2024-03-17 14:47:12 浏览: 147
Qt读取图片例子
要读取多个共享内存中的图片,您可以按照以下步骤进行:
1. 使用QSharedMemory类打开多个共享内存,分别对应0x7001,0x7002,0x7003,0x7004和0x7005。
2. 对于每一个共享内存,使用QBuffer类将其内容读取到QByteArray中。
3. 将QByteArray中的数据转换成QPixmap,即可显示图片。
下面是示例代码:
```cpp
#include <QApplication>
#include <QSharedMemory>
#include <QBuffer>
#include <QPixmap>
#include <QLabel>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// 打开多个共享内存
QSharedMemory sharedMemory1("0x7001");
QSharedMemory sharedMemory2("0x7002");
QSharedMemory sharedMemory3("0x7003");
QSharedMemory sharedMemory4("0x7004");
QSharedMemory sharedMemory5("0x7005");
// 显示图片的标签
QLabel label;
label.show();
// 读取共享内存中的图片
while (true)
{
if (sharedMemory1.attach())
{
QBuffer buffer;
QByteArray byteArray;
buffer.setBuffer(&byteArray);
buffer.open(QIODevice::ReadWrite);
buffer.write((const char*)sharedMemory1.constData(), sharedMemory1.size());
buffer.close();
sharedMemory1.detach();
QPixmap pixmap;
pixmap.loadFromData(byteArray);
label.setPixmap(pixmap);
}
if (sharedMemory2.attach())
{
QBuffer buffer;
QByteArray byteArray;
buffer.setBuffer(&byteArray);
buffer.open(QIODevice::ReadWrite);
buffer.write((const char*)sharedMemory2.constData(), sharedMemory2.size());
buffer.close();
sharedMemory2.detach();
QPixmap pixmap;
pixmap.loadFromData(byteArray);
label.setPixmap(pixmap);
}
if (sharedMemory3.attach())
{
QBuffer buffer;
QByteArray byteArray;
buffer.setBuffer(&byteArray);
buffer.open(QIODevice::ReadWrite);
buffer.write((const char*)sharedMemory3.constData(), sharedMemory3.size());
buffer.close();
sharedMemory3.detach();
QPixmap pixmap;
pixmap.loadFromData(byteArray);
label.setPixmap(pixmap);
}
if (sharedMemory4.attach())
{
QBuffer buffer;
QByteArray byteArray;
buffer.setBuffer(&byteArray);
buffer.open(QIODevice::ReadWrite);
buffer.write((const char*)sharedMemory4.constData(), sharedMemory4.size());
buffer.close();
sharedMemory4.detach();
QPixmap pixmap;
pixmap.loadFromData(byteArray);
label.setPixmap(pixmap);
}
if (sharedMemory5.attach())
{
QBuffer buffer;
QByteArray byteArray;
buffer.setBuffer(&byteArray);
buffer.open(QIODevice::ReadWrite);
buffer.write((const char*)sharedMemory5.constData(), sharedMemory5.size());
buffer.close();
sharedMemory5.detach();
QPixmap pixmap;
pixmap.loadFromData(byteArray);
label.setPixmap(pixmap);
}
}
return a.exec();
}
```
请注意,该示例代码只是一个简单的演示,实际应用中需要根据实际情况进行更改和优化。同时,为了防止界面卡顿或者无响应,您可能需要使用多线程来处理共享内存中的数据。
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