在 C# 中将 IntPtr 转换为 int*？
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Convert IntPtr to int* in C#?
提问by user20493
I have a C++ DLL returning an int*to a C# program. The problem is the int*in C# remains nullafter the assignment.
我有一个 C++ DLL 返回int*一个 C# 程序。问题是int*在 C#null中分配后仍然存在。
When I assign the C++ result to an IntPtr, I get a correct non-null value. However any attempt to convert this to an int*results in null.
当我将 C++ 结果分配给 时IntPtr，我得到一个正确的非空值。然而，任何试图将其转换为一个int*以结果null。
I've tried:
我试过了：
IntPtr intp = cppFunction (); // Non-null.
int* pi = (int *) intp; // Results in null.
int* pi = (int *) intp.ToPointer (); // Results in null.
void* vp = intp.ToPointer ();
int* pi = (int *) vp; // Results in null, but vp is non-null.
How can I get a non-null int*?
我怎样才能得到一个非 null int*？
Thanks! Alan
谢谢！艾伦
回答by James Black
You cppFunction declaration should be something like:
你的 cppFunction 声明应该是这样的：
void cppFunction(ref int* ptr) {
ptr = somevalue;
}
That should solve your problem.
那应该可以解决您的问题。
You may find this useful also: http://www.pcreview.co.uk/forums/thread-2902012.php
您可能会发现这也很有用：http: //www.pcreview.co.uk/forums/thread-2902012.php
