PRIMITIVE TYPES AND SIGNATURES in VB.NET

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CHAPTER 8 PRIMITIVE TYPES AND SIGNATURES
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unsafe, A could have been moved
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safe, B is pinned and cannot move
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Native Types
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When managed code calls unmanaged methods or exposes managed fields to unmanaged code, it is sometimes necessary to provide specific information about how the managed types should be marshaled to and from the unmanaged types. The unmanaged types recognizable by the common language runtime, also referred to as native, are listed in CorHdr.h in the enumeration CorNativeType. All constants in this enumeration have names that begin with NATIVE_TYPE_* ; for the purposes of this discussion, I have omitted these parts of the names or abbreviated them as N_T_. The same constants are also listed in the .NET Framework class library in the enumerator System.Runtime.InteropServices.UnmanagedType. Some of the native types are obsolete and are ignored by the runtime interoperability subsystem. But since these native types are not retired altogether, ILAsm must have ways to denote them and since ILAsm denotes these types, I cannot help but list obsolete types along with others, all of which you ll find in Table 8-6. Table 8-6. Native Types Defined in the Runtime
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0x01
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Constant Name
VOID
.NET Framework ILAsm Notation Type Name
void
Comments
Obsolete and thus should not be used; recognized by ILAsm but ignored by the runtime interoperability subsystem 4-byte Boolean value; true = nonzero, false = 0 Signed 1-byte integer Unsigned 1-byte integer Signed 2-byte integer Unsigned 2-byte integer Signed 4-byte integer Unsigned 4-byte integer Signed 8-byte integer Unsigned 8-byte integer 4-byte floating point 8-byte floating point Obsolete
0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D
BOOLEAN I1 U1 I2 U2 I4 U4 I8 U8 R4 R8 SYSCHAR
Bool I1 U1 I2 U2 I4 U4 I8 U8 R4 R8
bool int8 unsigned int8, uint8 int16 unsigned int16, uint16 int32 unsigned int32, uint32 int64 unsigned int64, uint64 float32 float64 syschar
Continued
CHAPTER 8 PRIMITIVE TYPES AND SIGNATURES
Table 8-6. Continued
Code
0x0E 0x0F 0x10 0x11 0x12 0x13
Constant Name
VARIANT CURRENCY PTR DECIMAL DATE BSTR
.NET Framework ILAsm Notation Type Name
variant Currency currency * decimal date BStr bstr
Comments
Obsolete Currency value Obsolete; use native int Obsolete Obsolete Unicode Visual Basic style string, used in COM interoperations Pointer to a zero-terminated ANSI string Pointer to a zero-terminated Unicode string Pointer to a zero-terminated ANSI or Unicode string, depending on platform Fixed-size system string of size <size> bytes; applicable to field marshaling only Obsolete IUnknown interface pointer IDispatch interface pointer C-style structure, for marshaling the formatted managed types Interface pointer Safe array of type <variant_type> Fixed-size array, of size <size> bytes Signed pointer-size integer Unsigned pointer-size integer Obsolete; use struct Visual Basic style string in a fixed-length buffer ANSI Visual Basic style string bstr or ansi bstr, depending on the platform 2-byte Boolean; true = 1, false = 0
0x14 0x15 0x16
LPSTR LPWSTR LPTSTR
LPStr LPWStr LPTStr
lpstr lpwstr lptstr
0x17
FIXEDSYSSTRING
ByValTStr
fixed sysstring [<size>]
0x18 0x19 0x1A 0x1B
OBJECTREF IUNKNOWN IDISPATCH STRUCT IUnknown IDispatch Struct
objectref iunknown idispatch struct
0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22 0x23 0x24 0x25
INTF SAFEARRAY FIXEDARRAY INT UINT NESTEDSTRUCT BYVALSTR ANSIBSTR TBSTR VARIANTBOOL
Interface SafeArray ByValArray IntPtr UIntPtr
interface safearray <variant_type> fixed array [<size>] int unsigned int, uint nested struct
VBByRefStr AnsiBStr TBStr VariantBool
byvalstr ansi bstr tbstr variant bool
Continued
CHAPTER 8 PRIMITIVE TYPES AND SIGNATURES
Table 8-6. Continued
Code
0x26 0x28 0x2A 0x2B 0x2C 0x2D
Constant Name
FUNC ASANY ARRAY LPSTRUCT
.NET Framework Type Name
FunctionPtr AsAny LPArray LPStruct
ILAsm Notation
method as any <n_type> [<sizes>] lpstruct
Comments
Function pointer Object; type defined at run time Fixed-size array of a native type <n_type> Pointer to a C-style structure
CUSTOMMARSHALER CustomMarshaler custom (<class_str>, Custom marshaler <cookie_str>) ERROR Error error Maps int32 to VT_HRESULT
The <sizes> parameter in the ILAsm notation for N_T_ARRAY, shown in Table 8-6, can be empty or can be formatted as <size> + <size_param_number>: <sizes> ::= <> | <size> | + <size_param_number> | <size> + <size_param_number> If <sizes> is empty, the size of the native array is derived from the size of the managed array being marshaled. The <size> parameter specifies the native array size in array items. The zero-based method parameter number <size_param_number> indicates which of the method parameters specifies the size of the native array. The total size of the native array is <size> plus the additional size specified by the method parameter that is indicated by <size_param_number>. A custom marshaler declaration (shown in Table 8-6) has two parameters, both of which are quoted strings. The <class_str> parameter is the name of the class representing the custom marshaler, using the string conventions of Reflection.Emit. The <cookie_str> parameter is an argument string (cookie) passed to the custom marshaler at run time. This string identifies the form of the marshaling required, and its notation is specific to the custom marshaler.
Variant Types
Variant types (popular in COM) are defined in the enumeration VARENUM in the Wtypes.h file, which is distributed with Microsoft Visual Studio. Not all variant types are applicable as safe array types, according to Wtypes.h, but ILAsm provides notation for all of them nevertheless, as shown in Table 8-7. It might look strange, considering that variant types appear in ILAsm only in the context of safe array specification, but we should not forget that one of ILAsm s principal applications is the generation of test programs, which contain known, preprogrammed errors.
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