Question

用于以下C com函数的等效C＃参数类型是什么？

对于下面的签名，我收到错误：

这很可能是因为托管PInvoke签名与非托管目标签名不匹配。检查PInvoke签名的调用约定和参数是否与目标非托管签名匹配。

C＃

[DllImport("Sn62.dll")]
public static extern int GetLicenseNo(string lpszLicenseKey, 
                                      string lpszEncryptionKey, 
                                      string lpBuffer, 
                                      ushort wBufferSize);

C代码

#define _SAL2_Source_(Name, args, annotes) _SA_annotes3(SAL_name, #Name, "", "2") _Group_(annotes _SAL_nop_impl_)

#define _Null_terminated_                 _SAL2_Source_(_Null_terminated_, (), _Null_terminated_impl_)

typedef int                 BOOL;
typedef _Null_terminated_ CHAR *LPSTR;
typedef unsigned short      WORD;



__declspec(dllexport)   BOOL  SN_GetLicenseNo(LPSTR lpszLicenseKey,LPSTR lpszEncryptionKey,LPSTR lpBuffer,WORD wBufferSize);


BOOL  GetLicenseNo(LPSTR lpszLicenseKey, LPSTR lpszEncryptionKey, LPSTR lpszBuffer, WORD wBufferSize)
{
    struct t_license *lp;
    BOOL bRet;

    if (wBufferSize<SIZE_LICENSENO + 1)
        return(FALSE);


    ClearText(lpszLicenseKey, lpszEncryptionKey);
    lp = (struct t_license *)DecodeBuffer;
    bRet = TRUE;

    CopyString(lpszBuffer, lp->LicenseNo, SIZE_LICENSENO); //lpszBuffer is used to return value.

    return(bRet);
}

Answer 1

我认为你很接近，你只需要告诉编组系统将哪种字符串编组为： <击> [DllImport（＆＃34; Sn62.dll＆＃34;，CallingConvention = CallingConvention.Cdecl）] public static extern int GetLicenseNo（[MarshalAs（UnmanagedType.LPStr）] string lpszLicenseKey， [MarshalAs（UnmanagedType.LPStr）] string lpszEncryptionKey， [MarshalAs（UnmanagedType.LPStr）] string lpBuffer， ushort wBufferSize）;

~~这样它就知道如何转换数据。~~

编辑：您可能还需要指定调用约定以匹配您正在使用的导出类型，请参阅CallingConvention属性中的DllImport。

根据Hans Passant的说法，这可能更为正确：

[DllImport("Sn62.dll", CallingConvention = CallingConvention.Cdecl)] public static extern int GetLicenseNo(StringBuilder lpszLicenseKey, StringBuilder lpszEncryptionKey, StringBuilder lpBuffer, ushort wBufferSize);

您可以致电：

ushort wBufferSize = 250; //Set to the size you need StringBuilder licKey = new StringBuilder(wBufferSize); StringBuilder encKey = new StringBuilder(wBufferSize); StringBuilder buffer = new StringBuilder(wBufferSize); //Intialize values here... GetLicenseNo(licKey, encKey, buffer, wBufferSize);

C中char点的等效c＃类型是什么

1 个答案: