智能设备开发中C#调用DLL传参及返回字符串的方法

来源：互联网发布：钓鱼潮汐软件下载编辑：程序博客网时间：2024/06/02 03:16

调试成功的
DLL 声明
int __declspec(dllexport) __stdcall pdaAppTest(TCHAR *_Data);
int __declspec(dllexport) __stdcall pdaAppTest2(TCHAR **_Data);
///////////////////程序
int pdaAppTest(TCHAR *_Data)
{
StringCchCopy(_Data,256,L"终于可以了"); return 0;
}

int pdaAppTest2(TCHAR **_Data)
{
StringCchCopy(*_Data,10,L"hellohello");
return 0;
}

int pdaAppWriteTest(unsigned char *_Data,TCHAR *_ReData)
{
   CString tmp;
   unsigned char tmpChar[6]="e3l5o";
   *_Data=*tmpChar;
   tmp.Format(L"%s",_Data);

   StringCchCopy(_ReData,10,tmp);
   return 0;
}

//////////////////////////////////////////////////////////////////////////////////////////////
C# 调用
[DllImport(DLLName, EntryPoint = "pdaAppTest",CharSet=CharSet.Unicode , SetLastError = true)]
public static extern short pdaAppTest( StringBuilder value);

[DllImport(DLLName, EntryPoint = "pdaAppTest2", CharSet = CharSet.Auto, SetLastError = true)]
public static extern short pdaAppTest2(ref string value);

private void button2_Click(object sender, EventArgs e)
{
string filename = "";
pdaAppTest2(ref filename);

label1.Text = filename;
//filename="hellohell"
}

private void button10_Click(object sender, EventArgs e)
{

StringBuilder strTmp = new StringBuilder(64);
pdaAppTest(strTmp);
label1.Text = strTmp.string();//终于可以了

}

private void button11_Click(object sender, EventArgs e)
        {
            StringBuilder strTmp2 = new StringBuilder();
            StringBuilder strTmp = new StringBuilder("gok");
            pdaAppWriteTest(strTmp, strTmp2);//strTmp=strTmp2="eok"
            label1.Text = strTmp.ToString()+strTmp2.ToString();

        }
/////////////////////////////////////////////////////////////////////

问题已经解决谢谢waterine;
不过我看网上还有说用C# byte来接收DLL返回的字符串,不知道大家谁知道,贴上来谢谢!!