使用Mupen64Plus非托管C dll API命令填充C#结构 [英] Populate C# struct using Mupen64Plus Unmanaged C dll API command
问题描述
我正在使用 Mupen64Plus 和随附的 m64p_test_rom.v64
文件。
I'm using Mupen64Plus and the included m64p_test_rom.v64
file.
我正在使用 C#与 mupen64plus.dll
用 C 编写的API。
I'm using C# to talk to the mupen64plus.dll
API which is written in C.
问题
我正在尝试使用其API命令 M64CMD_ROM_GET_HEADER
从<$获取ROM头c $ c> m64p_test_rom.v64 ,其中包含诸如 Name
, Manufacturer ID
, 国家/地区代码
。看起来该命令将数据存储在 struct
中。
I'm trying to use its API command M64CMD_ROM_GET_HEADER
to get the ROM Header from m64p_test_rom.v64
, which contains properties like Name
, Manufacturer ID
, Country code
. It looks like the command stores the data in a struct
.
问题是当调用API命令时填充 struct
,变量保持为空,不会使用新值填充它。
The problem is that when the API command is called to populate the struct
, the variables remain null, it does not populate it with new values.
我正在使用此C# API代码(来自BizHawk)与 mupen64plus.dll $ c进行对话$ c>。
I'm using this C# API code from BizHawk to talk to mupen64plus.dll
.
命令
-
CoreDoCommand(m64p_command命令,int ParamInt,void * ParamPtr)
命令枚举类型,指定应执行哪个命令。
Command Enumerated type specifying which command should be executed.
ParamInt:一个int可以用作命令输入的eger值。
ParamPtr:可以用作命令输入的指针。
ParamInt: An integer value which may be used as an input to the command.
ParamPtr: A pointer which may be used as an input to the command.
M64CMD_ROM_GET_HEADER
这将检索当前的标头数据打开ROM。 ROM映像必须打开。
This will retrieve the header data of the currently open ROM. A ROM image must be open.
ParamInt:指向rom_header结构的指针以接收数据。
ParamPtr:rom_header的字节大小结构。
ParamInt: Pointer to a rom_header struct to receive the data.
ParamPtr: The size in bytes of the rom_header struct.
ROM标头结构
在我的 C#
项目中,我创建了一个新的 struct
以匹配Mupen64Plus的 C
源代码。我不确定是否已将其从 C
正确转换为 C#
。
ROM Header struct
In my C#
project I created a new struct
to match the one in the Mupen64Plus's C
source code. I'm not sure if I have converted it from C
to C#
correctly.
Mupen64Plus C m64p_types.h
typedef struct
{
uint8_t init_PI_BSB_DOM1_LAT_REG; /* 0x00 */
uint8_t init_PI_BSB_DOM1_PGS_REG; /* 0x01 */
uint8_t init_PI_BSB_DOM1_PWD_REG; /* 0x02 */
uint8_t init_PI_BSB_DOM1_PGS_REG2; /* 0x03 */
uint32_t ClockRate; /* 0x04 */
uint32_t PC; /* 0x08 */
uint32_t Release; /* 0x0C */
uint32_t CRC1; /* 0x10 */
uint32_t CRC2; /* 0x14 */
uint32_t Unknown[2]; /* 0x18 */
uint8_t Name[20]; /* 0x20 */
uint32_t unknown; /* 0x34 */
uint32_t Manufacturer_ID; /* 0x38 */
uint16_t Cartridge_ID; /* 0x3C - Game serial number */
uint16_t Country_code; /* 0x3E */
} m64p_rom_header;
我的C#结构
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct m64p_rom_header
{
public byte init_PI_BSB_DOM1_LAT_REG; /* 0x00 */
public byte init_PI_BSB_DOM1_PGS_REG; /* 0x01 */
public byte init_PI_BSB_DOM1_PWD_REG; /* 0x02 */
public byte init_PI_BSB_DOM1_PGS_REG2; /* 0x03 */
public uint ClockRate; /* 0x04 */
public uint PC; /* 0x08 */
public uint Release; /* 0x0C */
public uint CRC1; /* 0x10 */
public uint CRC2; /* 0x14 */
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public uint[] Unknown; /* 0x18 */
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public byte[] Name; /* 0x20 */
public uint unknown; /* 0x34 */
public uint Manufacturer_ID; /* 0x38 */
public ushort Cartridge_ID; /* 0x3C - Game serial number */
public ushort Country_code; /* 0x3E */
};
非托管函数指针
我添加了一个新的委托声明,因此可以使用API的 CoreDoCommand()
函数和 M64CMD_ROM_GET_HEADER
命令。
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate m64p_error CoreDoCommandStruct(m64p_command Command, m64p_rom_header ParamInt, ref int ParamPtr);
CoreDoCommandStruct m64pCoreDoCommandStruct;
ROM获取标题
我正在尝试检索ROM的名称。
ROM Get Header
I'm trying to retrieve the ROM's Name.
运行API命令 M64CMD_ROM_GET_HEADER
应该填充 m64p_rom_header
结构
。
Running the API command M64CMD_ROM_GET_HEADER
should populate the m64p_rom_header
struct
.
code>名称属性应返回为Marshallh(GPL)的 Mupen64Plus演示
。
我收到错误 ArgumentNullException:数组不能为空。
在 rom_header.Name
上。
当我调用命令时,ROM已打开并正在运行。
The ROM is open and running when i call the command.
public m64p_rom_header rom_header;
public String ROMGetHeader()
{
// Get size of ROM Header struct
int size = Marshal.SizeOf(typeof(m64p_rom_header)); // returns value of 20?
// API ROM Get Header Command
// Question: Populates all variables in the m64p_rom_header struct?
m64pCoreDoCommandStruct(m64p_command.M64CMD_ROM_GET_HEADER, rom_header, ref size);
// Return the byte Array and convert to String
return System.Text.Encoding.Default.GetString(rom_header.Name); // <-- Error: Array null
}
推荐答案
您以错误的顺序将参数定义/传递给了方法。委托的第二个参数是 int 类型,第三个参数是 C 中的 void指针,应用于将数据作为参考。
例如,您可以在发送的链接中找到以下代码(BizHawk / mupen64pluseCoreApi.cs):
You have defined/passed the parameters to the method in the wrong order. The second parameter of the delegate is of type int and the third parameter is a void pointer in C and should be used to pass data as a reference. For example, you can find the following code in the link you sent (BizHawk/mupen64pluseCoreApi.cs) :
// Pass the rom to the core
result = m64pCoreDoCommandByteArray(m64p_command.M64CMD_ROM_OPEN, rom.Length, rom);
因此,委托的定义应如下:
So the definition of the delegate should be as the following:
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate m64p_error CoreDoCommandStruct(m64p_command Command, int ParamInt, ref m64p_rom_header ParamPtr);
CoreDoCommandStruct m64pCoreDoCommandStruct;
其使用方式应如下:
m64pCoreDoCommandStruct(m64p_command.M64CMD_ROM_GET_HEADER, size, ref rom_header);
这篇关于使用Mupen64Plus非托管C dll API命令填充C#结构的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!