qsharedmemory 封装函数
时间: 2023-11-17 15:06:38 浏览: 33
QSharedMemory是Qt中的一个类,用于在多个进程之间共享内存。下面是一个简单的QSharedMemory封装函数:
```cpp
#include <QSharedMemory>
#include <QString>
#include <QBuffer>
bool writeDataToSharedMemory(const QString& key, QByteArray& data)
{
QSharedMemory sharedMemory(key);
if (sharedMemory.isAttached()) {
sharedMemory.detach();
}
if (!sharedMemory.create(data.size())) {
return false;
}
sharedMemory.lock();
char* to = static_cast<char*>(sharedMemory.data());
const char* from = data.constData();
memcpy(to, from, qMin(sharedMemory.size(), static_cast<quint64>(data.size())));
sharedMemory.unlock();
return true;
}
bool readDataFromSharedMemory(const QString& key, QByteArray& data)
{
QSharedMemory sharedMemory(key);
if (!sharedMemory.attach()) {
return false;
}
sharedMemory.lock();
QBuffer buffer;
buffer.setData(static_cast<const char*>(sharedMemory.constData()), sharedMemory.size());
buffer.open(QBuffer::ReadOnly);
data = buffer.readAll();
sharedMemory.unlock();
sharedMemory.detach();
return true;
}
```
这个函数包含两个函数,一个用于将数据写入共享内存,另一个用于从共享内存中读取数据。在这个函数中,我们使用QBuffer类将共享内存中的数据读入QByteArray中,然后将其返回。