C++整数& C# 中的长编组
我目前正在将专有 dll（API）移植到 C#，在编组某些使用的数据类型时遇到一些问题。
例如，API 头文件定义了以下类型：
typedef unsigned int tINT; /* natural unsigned */
typedef signed int tINTs; /* natural signed */
typedef unsigned int tLONG; /* 32 bit unsigned */
typedef unsigned long tPTR; /* 32/64-bit pointer */
然后我有以下函数定义：
tINTs SomeApiFunction ( const tPTR hdl, tINT param );
我通常直接使用 C# 的 int (Int32），或未签名的版本。 API 的 tLONG 和 tINT 本身是相同的（至少对于 API 而言）。但我不确定tPTR。我现在在 C# 中将其设为 uint，因为它是 32 位 int，但我不确定 long 在 64 位计算机上的行为如何。
我需要做什么才能确保 API 在 32 位和 64 位机器上都能正常工作？
这就是我现在要做的：
[DllImport( "api.dll" )]
public static extern int SomeApiFunction ( uint hdl, uint param );
遗憾的是 API 并没有很好的文档记录，因此我不确定所有这些（重叠的）typedef 的意图是什么。除了我上面包含的标题注释之外，没有有关实际类型的信息。
I'm currently porting a proprietary dll (an API) to C#, and I have some problems when marshalling some of the used data types.
For example the API header file defines the following types:
typedef unsigned int tINT; /* natural unsigned */
typedef signed int tINTs; /* natural signed */
typedef unsigned int tLONG; /* 32 bit unsigned */
typedef unsigned long tPTR; /* 32/64-bit pointer */
Then I for example have the following function definition:
tINTs SomeApiFunction ( const tPTR hdl, tINT param );
I'm usually marshalling the int directly with C#'s int (Int32), or the unsigned version. The API's tLONG and tINT are as such the same (at least for the API). But I'm not sure with the tPTR. I have now made it a uint in C#, because it is a 32bit int, but I'm not sure how the long would behave on a 64bit machine.
What do I have to do to make sure that the API will work on both 32bit and 64bit machines correctly?
This is what I would have done now:
[DllImport( "api.dll" )]
public static extern int SomeApiFunction ( uint hdl, uint param );
Sadly the API is not really well documented, as such I am not sure what the intention was with all those (overlapping) typedefs. Apart from the header comments I have included above there is no information about the actual types.
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尝试将其编组为
IntPtr。在.Net中，IntPtr在32位系统上为4字节，在64位系统上为8字节。Try to Marshal it as an
IntPtr. IntPtr is 4 bytes on a 32bit system and 8 bytes on a 64bit system in .Net.它是C/C++编译器的实现细节。您应该按照注释声明它 IntPtr。如果代码是由 MSVC 编译器编译的，那么它就不能在 64 位模式下工作，它会长期使用 32 位。不足以存储指针。
It is an implementation detail of the C/C++ compiler. You should go by the comment and declare it IntPtr. If the code is compiled by the MSVC compiler then it isn't going to work in 64-bit mode, it uses 32-bits for a long. Not enough to store a pointer.
这是良好的类型对应列表。
在 C# 中，指针类型通常为
IntPtr。Here is good list of type correspondence.
For pointer types is usually
IntPtrin C#.如果我没记错的话
intuint和其他基本类型是底层 Windows API 的正确类型。然而，对于指针，最好在 C# 端使用
IntPtr，在 C/C++ 端使用void*。If I remember correctly
intuintand other primitive types are the right type for the underlying windows API.For pointers however, its best to use
IntPtron C# side andvoid*on C/C++ side.