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Match primitive types between C# and native code

Declare matching C# and C types so primitive values like int, float, and bool pass to native code without corruption.
読み終わるまでの所要時間 2 分最終更新 6日前
Primitive types are small value types that the runtime copies to the stack or a CPU register when you use them as function parameters or return values. You don't need to pin or otherwise manage the lifespan of primitive types when you call unmanaged functions.
C# has different names for many primitive types compared to C and other languages. For a full list of the unmanaged C types that correspond to managed C# types, refer to Platform invoke data types (Microsoft).
The following table shows the C type that some common C# types marshal to by default:

C# base type

C# alias name

Unmanaged C type

System.Int32
int
int32_t
System.Single
float
float
System.Char
char
char
System.Boolean
bool
int32_t
System.Byte
byte
unsigned char
Default marshalling is a starting point, not a guarantee. It can vary by platform and by context, such as whether the value is a parameter, a return value, or a struct field. For example, 
System.Boolean
marshals to a 4-byte value by default, and 
System.Char
marshals according to the 
CharSet
of the call. To control the exact representation when the default isn't what you need, use 
MarshalAsAttribute
 (Microsoft).

Use fixed-width types in unmanaged code

Use fixed-width C types, such as 
int32_t
from 
<stdint.h>
, in your unmanaged code rather than 
int
or 
long
. The size of 
long
in particular varies by platform: it's 32-bit on Windows but 64-bit on most other desktop and mobile platforms. If the managed and unmanaged code disagree about the size of a type, the data is corrupted.

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