java调用c++ dll一直报Invalid memory access

Question

想用java调用c#dll，各位，本来好好的，不知道为啥又不行了，一直报Invalid memory access，
不知道跟.net Net Framework 有没有关系，因为之前的c#dll是4.0的，后面改成4.7.2了 。各位兄弟姐妹救命！

java代码：

    static{
        //修改编码
        System.setProperty("jna.encoding", "GBK");
    }
    @Test
    void contextLoads()throws IOException {
        System.out.println(CLibrary.INSTANCE.GetOrder("123", "232", "13"));
         System.out.println(CLibrary.INSTANCE.GetParam(url, FactoryCode, "13","12","20","10","123"));
     
    }

    public interface CLibrary extends Library {
        // DLL文件默认路径为项目根目录，若DLL文件存放在项目外，请使用绝对路径 C:\Users\zhi\Desktop\dll\
        CLibrary INSTANCE = (CLibrary) Native.load( "C:\\Users\\zhi\\Desktop\\dll\\demo", CLibrary.class);
        // 声明将要调用的DLL中的方法（可以是多个方法）
        String GetOrder(String format, String  PASSWORD, String SHA1);
       String GetParam(String serverurl, String code, String line,
                        String specCode, String device, String proudct, String semproudct);
    }

c++：

#ifdef MYLIBAPI 
#else 
#define  MYLIBAPI  extern "C" __declspec(dllimport)     
#endif 

MYLIBAPI char* GetOrder(char* ServerUrl, char* FactoryCode, char* LineCode); //添加函数声明
MYLIBAPI char* GetParam(char* ServerUrl, char* FactoryCode, char* LineCode, char* SpecCode, char* DeviceCode, char* ProductItemNo, char* SemiProductItemNo);

#using "C:\\Users\\zhi\\Desktop\\dll\\MES.dll"
using namespace System;
using namespace MES;

char* GetOrder(char* ServerUrl, char* FactoryCode, char* LineCode)
{
    MESClient^ meh = gcnew MESClient();
    String^ url = gcnew String(ServerUrl);
    String^ code = gcnew String(FactoryCode);
    String^ line = gcnew String(LineCode);

    String^ resultstring = meh->GetOrder(url, code, line);
    char* result = (char*)(void*)System::Runtime::InteropServices::Marshal::StringToCoTaskMemAnsi(resultstring);
    return result;
}
char* GetParam(char* ServerUrl, char* FactoryCode, char* LineCode, char* SpecCode, char* DeviceCode, char* ProductItemNo, char* SemiProductItemNo)
{
    MESClient^ meh = gcnew MESClient();
    String^ url = gcnew String(ServerUrl);
    String^ code = gcnew String(FactoryCode);
    String^ line = gcnew String(LineCode);
    String^ speccode = gcnew String(SpecCode);
    String^ device = gcnew String(DeviceCode);
    String^ product = gcnew String(ProductItemNo);
    String^ semproduct = gcnew String(SemiProductItemNo);

    String^ resultstring = meh->GetParam(url, code, line, speccode, device, product, semproduct);
    char* result = (char*)(void*)System::Runtime::InteropServices::Marshal::StringToCoTaskMemAnsi(resultstring);
    return result;
}

Answer 1

你好 如何解决的？