C#调用C++dll

调用规则 _stdcall

回调函数参数转换，C#中回调函数以委托的形式。

 

C++数据类型	C#数据类型
void	void
int	int
char * 作为形参	System.string
const char * 作为返回值	IntPtr IntPtr slotName = ""; System.String strSlotName = Marshal.PtrToStringAnsi(slotName);

Invoke与BeginInvoke的区别，类似于SendMessage与PostMessage的区别，在调试过程中，遇到了关闭套接字界面卡死的现象，因为关闭套接字的时候刷新界面，阻塞了，所以界面卡死！

typedef void (_stdcall * jmapi_typedef_callback_func)(char * psz);
extern "C" __declspec(dllexport) void _stdcall jmapi_set_callback_func(jmapi_typedef_callback_func pFunc);
extern "C" __declspec(dllimport) int  _stdcall jmapi_init(int nDeviceType);
extern "C" __declspec(dllimport) int  _stdcall jmapi_find_device();
extern "C" __declspec(dllimport) int  _stdcall jmapi_exit();

public delegate void delCallbackFunc(System.String s);
public delegate void delRefreshUI(Control c, object o);

[DllImport(@"D:\CFDAS\Debug\JMAPI.dll")]
private static extern int jmapi_init(int nDeviceType);
[DllImport(@"D:\CFDAS\Debug\JMAPI.dll")]
private static extern int jmapi_exit();
[DllImport(@"D:\CFDAS\Debug\JMAPI.dll")]
private static extern int jmapi_find_device();
[DllImport(@"D:\CFDAS\Debug\JMAPI.dll")]
private static extern void jmapi_set_callback_func(delCallbackFunc pFunc);

private delCallbackFunc callbackFunc = null;
callbackFunc = new delCallbackFunc(CSharpCallbackFunc);
jmapi_set_callback_func(callbackFunc);

public void CSharpCallbackFunc(System.String s)
{
    this.BeginInvoke(new delRefreshUI(RefreshUI), new object[] { this.listBox1, s });
}
public void RefreshUI(Control c, Object o)
{
    ((ListBox)c).Items.Add(o.ToString());
}