Compiler Error C3834
Visual Studio 2010
illegal explicit cast to a pinning pointer; use a pinned local variable instead
Explicit casts to a pinned pointer are not allowed.
The following sample generates C3834.
// C3834.cpp
// compile with: /clr
int main() {
int x = 33;
pin_ptr<int> p = safe_cast<pin_ptr<int> >(&x); // C3834
pin_ptr<int> p2 = &x; // OK
}
The following sample generates C3834.
// C3834_b.cpp
// compile with: /clr:oldSyntax
using namespace System;
int main() {
const __wchar_t * pS = reinterpret_cast<const __wchar_t __pin*>(S"hello"); // C3834
// OK
// declare a pinning variable
String __pin* ppin = S"Hello";
// cast pinning variable to unmanaged type
const __wchar_t * pS2 = reinterpret_cast<__wchar_t*>(ppin);
pS2 += 6;
}
