急求大神帮助！！C#调用C++dllSystem.AccessViolationException”类型的未经处理的异常出现在 mscorlib.dll 中。

[yi_chuan_yang]

“System.AccessViolationException”类型的未经处理的异常出现在 mscorlib.dll 中。

其他信息: 尝试读取或写入受保护的内存。这通常指示其他内存已损坏。
代码如下
//////C++ dll 代码

HWND hWnd;
extern "C" __declspec(dllexport) void cOSG(HWND mhWnd)
{
hWnd=mhWnd;
}
extern "C" __declspec(dllexport) void InitOSG()
{
。。。。
}
////////C#代码
[DllImport("viewdll.dll")]
public static extern void InitOSG();
[DllImport("viewdll.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void cOSG(IntPtr mhWnd);
//////调用
private void Form1_Load(object sender, EventArgs e)
{
Class1.cOSG(this.panel1.Handle);
}

private void button1_Click(object sender, EventArgs e)
{
Thread aThread = new Thread(new ThreadStart(Class1.InitOSG));
aThread.Start();
}

运行时出现
在 System.AccessViolationException 中第一次偶然出现的“mscorlib.dll”类型的异常
“System.AccessViolationException”类型的未经处理的异常出现在 mscorlib.dll 中。

其他信息: 尝试读取或写入受保护的内存。这通常指示其他内存已损坏。

有什么问题呢？？？？？？

[yi_chuan_yang]

没有大神指教么

[-小蕾-]

//c++函数强制声明
        [DllImport("mi.dll", EntryPoint = "API_OpenComm")]
        public static extern IntPtr API_OpenComm(int nCom, int nBaudrate);

        [DllImport("mi.dll", EntryPoint = "API_CloseComm")]
        public static extern bool API_CloseComm(IntPtr commHandle);

        [DllImport("mi.dll", EntryPoint = "API_ControlBuzzer")]
        public static extern int API_ControlBuzzer(IntPtr commHandle, int DeviceAddress, byte freq, byte duration, ref byte buffer);

        [DllImport("mi.dll", EntryPoint = "API_MF_Read")]
        public static extern int API_MF_Read(IntPtr commHandle, int DeviceAddress, byte mode, byte blk_add, byte num_blk, ref byte snr, ref byte buffer);

        private void Form1_Load(object sender, EventArgs e)
        {
            Program.Port = API_OpenComm(4, 9600);
            if (Program.Port.ToInt32() == 0)
            {
                labelControl2.Visible = false;
                labelControl3.Visible = true;
                buttonX1.Visible = true;
                return;

            }
            byte pBuf = new byte();
            Program.G_start = API_ControlBuzzer(Program.Port, 0, 3, 1, ref pBuf);
            if (Program.G_start == 0)
            {
                labelControl2.Visible = true;
                labelControl3.Visible = false;
                buttonX1.Visible = false;
            }
            //启动时间轴
            timer1.Interval = 1000;
                timer1.Start();
        }

[yi_chuan_yang]

引用 2 楼 zyl_leilei 的回复:

//c++函数强制声明
        [DllImport("mi.dll", EntryPoint = "API_OpenComm")]
        public static extern IntPtr API_OpenComm(int nCom, int nBaudrate);

        [DllImport("mi.dll", EntryPoint = "API_CloseComm")]
        public static extern bool API_CloseComm(IntPtr commHandle);

        [DllImport("mi.dll", EntryPoint = "API_ControlBuzzer")]
        public static extern int API_ControlBuzzer(IntPtr commHandle, int DeviceAddress, byte freq, byte duration, ref byte buffer);

        [DllImport("mi.dll", EntryPoint = "API_MF_Read")]
        public static extern int API_MF_Read(IntPtr commHandle, int DeviceAddress, byte mode, byte blk_add, byte num_blk, ref byte snr, ref byte buffer);

        private void Form1_Load(object sender, EventArgs e)
        {
            Program.Port = API_OpenComm(4, 9600);
            if (Program.Port.ToInt32() == 0)
            {
                labelControl2.Visible = false;
                labelControl3.Visible = true;
                buttonX1.Visible = true;
                return;

            }
            byte pBuf = new byte();
            Program.G_start = API_ControlBuzzer(Program.Port, 0, 3, 1, ref pBuf);
            if (Program.G_start == 0)
            {
                labelControl2.Visible = true;
                labelControl3.Visible = false;
                buttonX1.Visible = false;
            }
            //启动时间轴
            timer1.Interval = 1000;
                timer1.Start();
        }

我的错在哪了 呢 该如何修改

[-小蕾-]

引用 3 楼 u011347730 的回复:

[quote=引用 2 楼 zyl_leilei 的回复:]

//c++函数强制声明
        [DllImport("mi.dll", EntryPoint = "API_OpenComm")]
        public static extern IntPtr API_OpenComm(int nCom, int nBaudrate);

        [DllImport("mi.dll", EntryPoint = "API_CloseComm")]
        public static extern bool API_CloseComm(IntPtr commHandle);

        [DllImport("mi.dll", EntryPoint = "API_ControlBuzzer")]
        public static extern int API_ControlBuzzer(IntPtr commHandle, int DeviceAddress, byte freq, byte duration, ref byte buffer);

        [DllImport("mi.dll", EntryPoint = "API_MF_Read")]
        public static extern int API_MF_Read(IntPtr commHandle, int DeviceAddress, byte mode, byte blk_add, byte num_blk, ref byte snr, ref byte buffer);

        private void Form1_Load(object sender, EventArgs e)
        {
            Program.Port = API_OpenComm(4, 9600);
            if (Program.Port.ToInt32() == 0)
            {
                labelControl2.Visible = false;
                labelControl3.Visible = true;
                buttonX1.Visible = true;
                return;

            }
            byte pBuf = new byte();
            Program.G_start = API_ControlBuzzer(Program.Port, 0, 3, 1, ref pBuf);
            if (Program.G_start == 0)
            {
                labelControl2.Visible = true;
                labelControl3.Visible = false;
                buttonX1.Visible = false;
            }
            //启动时间轴
            timer1.Interval = 1000;
                timer1.Start();
        }

我的错在哪了 呢 该如何修改[/quote] 为什么要Class1.InitOSG?你上面声明的c++函数跟下面的Load和button1_Click不是在一个类里面吗？ 不行你调试一下看看是哪句代码出了问题。。。