C指针结构-缓冲区指向另一个结构。 如何在C＃中？

Question

This was given to me in C:

CDCAInput := PTCDCAInput(@CDCAr);

I was only told: The pointer of the structure TCDCAInput is used by functions to pass additional input fields required for transactions. Buffer to which it points will be filled in response with the CDCAResult structure.

I think the @CDCAr is an instance of the CDCAResult structure. But not entirely sure about the meaning of the entire line of code.

For someone like me who doesn't know C ... I cannot figure how to write its equivalent in C#.

Any assistance is greatly appreciated. thanks

Answer 1

I don't know C# so I can't fully answer the question, but can explain some things that may help...

It's a common convention in Pascal and Delphi to name structured types (Records and Classes) starting with "T". Another convention is to name pointer types starting with "P".

With those conventions, there is probably a Record (like a C struct) type named TCDCAInput , and also a type named PTCDCAInput declared as a pointer to a TCDCAInput .

@ is Pascal's "address of" operator, which gives the address of a variable.

Pascal type-casts have a syntax like this: TypeName(VariableName)

So overall, the line:

CDCAInput := PTCDCAInput(@CDCAr);

Means: cast the address of the CDCAr variable to the PTCDCAInput type, and assign that value to the CDCAInput variable.