c语言:
typedef char * (__stdcall *MYPROC)(char * s, char * rs);//函数原型，s:传入数据，rs:返回数据。
HINSTANCE hinstLib;
MYPROC send;
BOOL fFreeResult, fRunTimeLinkSuccess = FALSE;
WCHAR msg[] = L"{\"head\":{\"jylsh\":\"330199103576000000000000001811\",\"xxlxm\":\"C009\",\"fhsj\":\"\",\"xxfhm\":\"\",\"fhxx\":\"\",\"yytcq\":\"330799\",\"zdjbh\":\"Test11111\",\"yljgdm\":\"8095\",\"czydm\":\"\",\"bbh\":\"1.0\"},\"data\":{\"ksjgs\":{\"klb\":\"12\",\"knsj\":\"A30533169330799D1560000050009A4378127B360\"}}}";
wprintf(L"%s", msg);
WCHAR P[] = L"";
char oututfmsg[1024] = { 0 };
WCHAR outmsg[2048] = { 0 };
char utfmsg[10240] = { 0 };
unicode_to_utf8((short *)msg, utfmsg);
hinstLib = LoadLibrary(TEXT("SendRcvB.dll"));
if (hinstLib != NULL)
{
printf("begin GetProcAddres\n");
send = (MYPROC)GetProcAddress(hinstLib, "SendRcv");
if (NULL != send)
{
char * rcode = send(utfmsg, oututfmsg);//调试发现oututfmsg调用前后未发生变化
fRunTimeLinkSuccess = TRUE;
}
wprintf(L"%s", oututfmsg);
fFreeResult = FreeLibrary(hinstLib);
}
c#代码如下：
[DllImport("SendRcvB.dll", CharSet = CharSet.None, CallingConvention = CallingConvention.StdCall)]
private extern static IntPtr SendRcv(IntPtr sSend, out IntPtr sRcv);
public Main()
{
InitializeComponent();
}
private void btn_fs_Click(object sender, EventArgs e)
{
try
{
string sRcv, sRs;
string sIn = rTextIn.Text;
byte[] tmpIn = gbkToUft8(sIn);
IntPtr pIn = mallocIntptr(tmpIn.Length);
Marshal.Copy(tmpIn, 0, pIn, tmpIn.Length);
//IntPtr pIn = mallocIntptr(sIn);
IntPtr pOut = IntPtr.Zero;
IntPtr pRs = IntPtr.Zero;
pRs = SendRcv(pIn, out pOut);//pOut指针在变化，能指向返回数据
sRcv = Marshal.PtrToStringUni(pOut);
sRs = Marshal.PtrToStringAnsi(pRs);
sRcv = utf8ToGbk(sRcv);
rTextOut.Text = sRcv;
Marshal.FreeHGlobal(pIn);
}
catch (Exception oe)
{
MessageBox.Show(oe.Message);
}