c#中如何调用vc++写的动态链接库

当VC等调用C#写的COM时，用regasm /tlb生成TLB文件，也可用tlbexp.exe，在VC等中加载TLB文件,当用C#调用VC等写的COM时，用tlbimp.exe，你可以写一个程序调试一下

添加System.Runtime.InteropServices命名空间

如是COM就直接用静态函数调用：
public static int GetNum(
int lFileSeqNo,
string sExtType,
string sExtNumber,
string sFormID,
string sOperationDate,
string sSystemRegistDate,
out int lCount,
out int lErrorType,
out int lErrorCode)
{
int iRet;

WOBCom.ObjClass obj = new WOBCom.ObjClass();

iRet = obj.GetNum(
lFileSeqNo,
sExtType,
sExtNumber,
sFormID,
sOperationDate,
sSystemRegistDate,
out lCount,
out lErrorType,
out lErrorCode);

return iRet;
}
如不使COM是普通的DLL
不能直接用
只能在C++中加一个对外的接口：
extern "C" __declspec(dllexport) WOExtConRegObj* OutGetObjConstructor();
extern "C" __declspec(dllexport) void OutGetObjDestructor(WOExtConRegObj* outGetObj);

extern "C" __declspec(dllexport) long SelectDummyRecord(long *lErrorType,
long *lErrorCode,
WOExtConRegObj* outGetObj);
//
extern "C" __declspec(dllexport) WOExtConRegObj* OutGetObjConstructor()
{
WOExtConRegObj* outGetObj = new WOExtConRegObj();

return outGetObj;
}

extern "C" __declspec(dllexport) void OutGetObjDestructor(WOExtConRegObj* outGetObj)
{
delete outGetObj;
}

extern "C" __declspec(dllexport) long SelectDummyRecord(long *lErrorType,
long *lErrorCode,
WOExtConRegObj* outGetObj)
{
return outGetObj->SelectDummyRecord(lErrorType,
lErrorCode);

}
C#就可直接调用了
[DllImport("XXX.dll",
EntryPoint="SelectDummyRecord",
ExactSpelling=false,
CallingConvention=CallingConvention.Cdecl)]
private static extern int SelectDummyRecord(
out int lErrorType,
out int lErrorCode,
int outGetObj);

/// <summary>
/// </summary>
/// <remarks>
/// </remarks>
/// <param name="lErrorType"></param>
/// <param name="lErrorCode"></param>
/// <returns></returns>
public int SelectDummyRecord(
out int lErrorType,
out int lErrorCode)
{
int intRtn;

intRtn = SelectDummyRecord(
out lErrorType,
out lErrorCode,
m_OutGetObj);

return intRtn;
}