Compiler Warning (level 1) C4397
Visual Studio 2015
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at Compiler Warning (level 1) C4397.
DefaultCharSetAttribute is ignored
DefaultCharSetAttribute is ignored by the Visual C++ compiler. To specify a character set for the DLL, use the CharSet option of DllImport. For more information, see Using C++ Interop (Implicit PInvoke).
The following sample generates C4397.
// C4397.cpp
// compile with: /W1 /c /clr
using namespace System;
using namespace System::Runtime::InteropServices;
[module:DefaultCharSetAttribute(CharSet::Unicode)]; // C4397
[DllImport("kernel32", EntryPoint="CloseHandle", CharSet=CharSet::Unicode)] // OK
extern "C" bool ImportDefault(IntPtr hObject);
public ref class MySettingVC {
public:
void method() {
ImportDefault(IntPtr::Zero);
}
};
[StructLayout(LayoutKind::Explicit)]
public ref struct StructDefault1{};
public ref class ClassDefault1{};
Show: