This message was discovered on microsoft.public.dotnet.framework.interop.
Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions.
| Adlene Sifi (VIP) |
Hello,
I am trying to call a C function from a dll. These function take a pointer
to a structure as a parameter. This structure is allocated into the unmanged
heap by the C function (it uses some malloc). I would like to know the best
way to release this memory . For the moment I have created a new C function
that release the memory and I call it from the managed code. For this to work
I have to keep a pointer to my structure into the native code.
Those are my two functions (from my class):
A )
[DllImport("ArutlManagedBridge.dll",
EntryPoint="GetManagedEnvironment",CharSet=CharSet::Ansi,
CallingConvention=CallingConvention::StdCall)]
static System::Int32 GetManagedEnvironment(
[InAttribute,OutAttribute,MarshalAs(UnmanagedType::Struct)]
adsManagedGetEnvironment * GetEnvironment);
B)
[DllImport("ArutlManagedBridge.dll",
EntryPoint="ReleaseEnvironment",CharSet=CharSet::Ansi,
CallingConvention=CallingConvention::StdCall)]
static System::Int32 ReleaseEnvironment();
This is my structure :
[StructLayout(LayoutKind::Sequential, CharSet=CharSet::Ansi)]
public __value struct adsManagedGetEnvironment
{
[MarshalAs(UnmanagedType::ByValArray, SizeConst=2)]
System::Int16 _null __gc[];
System::IntPtr APXResult;
System::Int32 APXStatus;
[MarshalAs(UnmanagedType::ByValTStr, SizeConst=512)]
System::String * APXMessage;
System::IntPtr APXSupInfo;
....
....
};
Thanks a lot
Adlene Sifi
|
|
| |
| | |
|
|
|
|
