下面提到的是我在c++中的dll函数
static bool t72CalculateRMDMethodResult( const double AccountBalanceAtSetup,
const long ClientCurrentAge,
const char Frequency,
double * pRMDMethodResult,
IRSLookupTable & LookupTable)
下面提到的是我的 C++ 类,它有一个指针作为参数传递给上述函数
class IRSLookupTable
{
public:
struct IRSLookupTableRow
{
unsigned int Key;
double Value;
};
IRSLookupTable( const char * pFilename );
IRSLookupTable( const struct IRSLookupTableRow Table[], const unsigned int NumEntries );
virtual ~IRSLookupTable();
bool LookupValueByKey(const unsigned int Key, double * Value);
virtual bool ParseLine( char * Buffer, unsigned int * Key, double * Value);
bool IsInitialized();
private:
typedef map <unsigned int, double> IRSLookupTableData;
IRSLookupTableData m_IRSTableData;
bool m_bInitialized;
};
下面是我如何在c#中调用c++ dll函数,我不确定它是否正确,我无法进入dll函数
[DllImport("t72CalculatorDLL.dll", ExactSpelling = true, EntryPoint = "t72CalculateRMDMethodResult")]
public static extern bool t72CalculateRMDMethodResult(double AccountBalanceAtSetup, int ClientCurrentAge, char Frequency, double* pRMDMethodResult, [MarshalAs(UnmanagedType.LPStruct)] ref IRSLookupTable LookupTable);
这是我用c#写的c++类的定义
[DataContract]
public unsafe class IRSLookupTable
{
public struct IRSLookupTableRow
{
public uint Key;
public double Value;
};
public IRSLookupTable()
{
m_bInitialized = true;
}
public IRSLookupTable(char* pFilename)
{
// uint Key;
// double Value;
// m_bInitialized = false;
// Debug.Assert( pFilename );
// if (pFilename ==null )
//{
// // return without setting the flag to true
// return;
//}
//// open the file
//std::ifstream InputFile(pFilename);
//if ( ! InputFile )
//{
// // return without setting the flag to true
// return;
//}
//while ( InputFile.getline( &gTmpBuffer[0], BUFFERSIZE) )
//{
// if ( ! ParseLine( gTmpBuffer, &Key, &Value ) )
// {
// m_IRSTableData[Key] = Value;
// }
// else
// {
// // return without setting the flag to true
// return;
// }
//}
//m_bInitialized = true;
}
public IRSLookupTable(IRSLookupTableRow* Table, uint NumEntries)
{
m_bInitialized = false;
for (uint i = 0; i < NumEntries; i++)
{
m_IRSTableData[Table[i].Key] = Table[i].Value;
}
m_bInitialized = true;
}
~IRSLookupTable() { }
public bool LookupValueByKey(uint Key, double* Value) { return true; }
public virtual bool ParseLine(char* Buffer, uint* Key, double* Value) { return true; }
public bool IsInitialized() { return true; }
private SortedDictionary<uint, double> m_IRSTableData;
private bool m_bInitialized;
}
谁能帮我解决这个问题,我是 c# 的新手。
最佳答案
我没看到你在哪里导出 C++ 函数???您将 t72...func 定义为“静态”???您希望它只在定义它的 .cpp 文件中可见???
我建议将您的 C++ 函数定义为:
extern "C" bool WINAPI t72CalculateRMDMethodResult( const double AccountBalanceAtSetup,
const long ClientCurrentAge,
const char Frequency,
double * pRMDMethodResult,
IRSLookupTable & LookupTable)
编辑您的 .def 文件并为 t72CalculateRMDMethodResult 添加一个导出条目。
您可以使用“dumpbin/exports mydll.dll”来确定函数是否正确导出。 (显然用你的 dll 替换 mydll.dll)
关于C# 代码没有调用它应该调用的 c++ dll 函数(它有一个类指针作为参数),我不应该更改 c++ 代码,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10536349/