PInvoke 期间的访问冲突
我有这个 dll 调用：
[DllImport("FreqCntPcIntf.dll", CallingConvention = CallingConvention.StdCall)]
public static extern Intf_ErrorType FreqCntIntf_Init(
ref byte InstNo,
string InstName,
string PortServerName,
ulong UartComPort,
ulong MaxBlockTime);
enum Intf_ErrorType
{
...
}
C++ 声明是这样的：
FREQCNTINTF_API Intf_ErrorType STDCALL FreqCntIntf_Init(InstanceNoType* InstNo, const char* InstName, const char* PortServerName, rsuint32 UartComPort, rsuint32 MaxBlockTime);
其中：
typedef enum
{
....
} RSENUM8(Intf_ErrorType);
#define FREQCNTINTF_API __declspec(dllexport)
typedef rsuint8 InstanceNoType;
typedef unsigned char rsuint8;
#define RSENUM32(EnumName) Enum_##EnumName; typedef rsuint32 EnumName
我在调用期间收到 AccessViolation。我应该在哪里寻找错误？
I have this dll call:
[DllImport("FreqCntPcIntf.dll", CallingConvention = CallingConvention.StdCall)]
public static extern Intf_ErrorType FreqCntIntf_Init(
ref byte InstNo,
string InstName,
string PortServerName,
ulong UartComPort,
ulong MaxBlockTime);
enum Intf_ErrorType
{
...
}
And the C++ declaration is this:
FREQCNTINTF_API Intf_ErrorType STDCALL FreqCntIntf_Init(InstanceNoType* InstNo, const char* InstName, const char* PortServerName, rsuint32 UartComPort, rsuint32 MaxBlockTime);
where:
typedef enum
{
....
} RSENUM8(Intf_ErrorType);
#define FREQCNTINTF_API __declspec(dllexport)
typedef rsuint8 InstanceNoType;
typedef unsigned char rsuint8;
#define RSENUM32(EnumName) Enum_##EnumName; typedef rsuint32 EnumName
I receive AccessViolation during call. Where should I look to find the bug?
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rsuint32应表示为uint（4 字节宽），而不是ulong（在 C# 中为 8 字节长）。另外，您可能想通过指定 CharSet 来确保您的字符串已正确编组，如下所示：rsuint32should be expressed asuint, which is 4-byte wide, notulong, which in C# is 8 byte long. Also, you might want to make sure, that your strings are marshalled proplery, by specifying CharSet, like this: