[英]MEX C++ raw data access
I'm trying to access the raw data of a MATLAB matrix passed to a MEX C++ function based on the answer here . 我试图根据此处的答案访问传递给MEX C ++函数的MATLAB矩阵的原始数据。 Strangely, I get a memory access error every time. 奇怪的是,我每次都会遇到内存访问错误。 How do I access the raw data? 如何访问原始数据?
void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs)
{
TypedArray<uint32_t> dataArray = std::move(inputs[0]);
uint32_t* dataRaw = dataArray.release().get();
for (auto& elem : dataArray)
{
elem *= 2; // Works
uint32_t x = (*dataRaw); // Memory access error
++dataRaw;
}
[...]
}
The problem was solved by storing the pointer returned from the release() method explicitly. 通过显式存储从release()方法返回的指针,解决了该问题。 It seems that the data is lost otherwise. 看来数据丢失了。
TypedArray<uint32_t> dataArray = std::move(inputs[0]);
auto dataPtr = dataArray.release();
uint32_t* dataRaw = dataPtr.get();
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