C#调用C++dll接收指针

zhangtong_76 2014-04-23 02:24:04

请各位大神多多指教，在C#给C++dll函数传递一张图片，然后再C++函数中处理，之后将处理过的图片传给C#

//这是C++函数,bytes为C#给C++的图片，data是C++需要传给C#的图片

int MyImageChangeDll::MainDll(double desWidth,double desHeigh,BYTE *bytes,INT *len , BYTE *data)

//C#函数

 [DllImport("ImageChangeDll.dll")]

 public static extern 

 int MainDll(double desWidth, double desHeigh, Byte[] pObject, ref int len, ref Byte[] data);



DoMain

{

            Bitmap bmp = new Bitmap(bmpPath);

            MemoryStream ms = new MemoryStream();

            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);

            byte[] bytes = ms.GetBuffer();

            byte[] data = new byte[415801+10];

            byte[] data1 = new byte[100];

            MainDll(420, 330,  bytes, ref len, ref data);

}

在C#中这样接收对不对,运行到MainDll函数时，data为什么接收不到C++传来的值？

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xzweihe 2014-04-23

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没有分数借楼主的帖子发个求助 VC的接口 Bool GetKeyPadStatus( byte * addr, char * pstatus, char * pnumber,byte* ptocounter); C# 调用 [DllImport("KeyPad.dll", CallingConvention = CallingConvention.StdCall)] public static extern bool GetKeyPadstatus(ref byte addr, ref string pstatus, ref string pnumber, ref byte ptocounter); //获取终端状态函数调用函数 byte address1 = 1; //byte address2 = 2; string pstatus = "0"; //////////这个值 string pnumber = "0000"; byte mtocounter = 0;// bool temp = calldll.GetKeyPadstatus(ref address1, ref pstatus, ref pnumber, ref mtocounter); if (temp) { switch (pstatus[0]) { case '0': label7.Text = "怎么是0 零没有获得呼叫器的状态值"; break; case 'L': label7.Text = "空闲状态，按了清除键了"; break; case 'E': label7.Text = "暂停状态，按了暂停键"; break; case 'W': label7.Text = "等待" + pnumber; break; case 'P': label7.Text = "呼叫" + pnumber; //重复呼叫 CallAndPrint(); break; case 'M': label7.Text = "转移" + pnumber + "到" + mtocounter.ToString() + "窗口"; break; case 'S': label7.Text = "正在受理" + pnumber; break; case 'U': label7.Text = "呼叫器要求派号"; byte waitnum = 100; //等待人数 calldll.setKeyPadnumber(ref address1, ref pnumber, waitnum); Thread.Sleep(120); CallAndPrint(); break; } } 最后获取的pstatus 值是 0 也就是我开始刚给他的赋值

zhangtong_76 2014-04-23

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//C#给C++的bytes数组，在C++已经成功接收并且处理了；这个data是C++返回给C#的图片，C#接收不成功
IplImage plmg = IplImage(desImg);
char *data1 = plmg.imageData;
*len = strlen(data1);
data=(BYTE*)data1;