Great, it worked!

Mark Salsbery wrote:

This typedef UCHAR (__cdecl *RESPONSE_FUNC)(UCHAR eventID); should be typedef UCHAR (__stdcall *RESPONSE_FUNC)(UCHAR eventID);

It's a third party library, I'm not able to change it :( And yes, I'm sure the buffer is bigh enough... it should be 3 bytes, I'm passing 10 ;)

I've a third party DLL that exports this function:

typedef UCHAR (__cdecl *RESPONSE_FUNC)(UCHAR eventID);

__declspec(dllimport) void SetCallback(RESPONSE_FUNC pfResponse, UCHAR* responseBuffer);

I must allocate the buffer, call the SetCallback function, and read the modified data when the callback function is called. I tried with this code:

static byte[] responseBuffer = new byte[10];

delegate bool RESPONSE_FUNC(byte eventID);

[DllImport("mydll.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern void ANT_SetCallback (RESPONSE_FUNC callback, byte[] responseBuffer);

public void test
{
ANT_SetCallback (EventCallback, responseBuffer);
}

static bool EventCallback(byte eventID)
{
return true;
}

When the dll doesn't try to modify the buffer then the Callback function is called without errors(the first event doesn't access the buffer). But when the DLL tries to modify the data in the buffer, the program crashes with a 0xc0000409 exception. I'm stuck on this, any suggestion ?

modified on Sunday, November 9, 2008 1:01 PM

No, I haven't access to the activeX source code, but the activeX it is freely available at http://www.kolbasoft.com/ I put the test projects (c# and c++), the link to the activeX and a a few notes in www.vernazza.org/Vecad.zip I agree with you, it seems that GetData is passing out the long* that I passed it before instead of the data pointed, but I can't understand why it works while I call that function from c++ , and it doesn't when I call it from c#!

It doesn't work :( Your code works, but it stops if I use different unmanaged memory areas when storing and when retrieving or if I change the data in the unmanaged memory. For example, this code doesn't work: // Create buffer Int32[] buffer = new Int32[10]; buffer[5] = 1; // Allocate and copy to unmanaged memory IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Int32)) * 10); Marshal.Copy(buffer, 0, ptr, 10); // **** Need to add this, otherwise c# complains about not being able to convert IntPtr to int int bptr = (int)ptr; ocx.PutData(ref bptr, Marshal.SizeOf(typeof(Int32)) * 10); // Change buffer, so we can see that the ptr has restored the // old value buffer[5] = 2; // **** Allocate another are to retrieve data IntPtr ptr2 = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Int32)) * 10); int bptr2 = (int)ptr2; ocx.GetData(ref bptr2); // **** Here there is the problem: when GetData() returns, // the bptr2 variable has been changed and its value is = bptr = (int ptr) // Copy from unmanged memory back to array Marshal.Copy(ptr2, buffer, 0, 10); // Free memory, or else we will leak it Marshal.FreeHGlobal(ptr); Marshal.FreeHGlobal(ptr2);

I'm using in a project an activeX component with these 3 methods: public void PutData(ref int pData, int nBytes); public int GetDataSize(); public void GetData(ref int pData); The same functions, in a c++ project are: void PutData(long* pData, long nBytes); long GetDataSize(); void GetData(long* pData); With the first function I pass a buffer to the component and the component copies it in its own buffer. With the third function I pass a buffer to the component and the component copies in my buffer the data that it previously stored in its own buffer. I can't get the component work properly, because it seems to copy only the first 4 bytes (= the first integer). I tried the component in a c++ project and it works properly, so I think that the problem is in the way I'm passing the data to the activex. I use the functions in this way: int[] buffer = new int[10]; int[] buffer_check = new int[10]; for (int i=0; i<10; i++) buffer[i] = i; ocx.PutData(ref buffer[0], 10*sizeof(int)); //That's works OK System.Diagnostics.Debug.Assert(ocx.GetDataSize() == 10*sizeof(int)); ocx.GetData(ref buffer_check[0], 10*sizeof(int)); //This fails for any i != 0 for (i=0; i<10; i++) System.Diagnostics.Debug.Assert(buffer_check[i] == buffer[i]); Someone has any idea about what I'm doing wrong? Thanks! Paolo

Hi, I'm looking for some wave files for simple events (success, fail). Do you know where I can find them?

gsmlib is written in C. take a look

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[quote]Not being able to register sounds like it cannot be loaded.[/quote] It crashes and then reports the error "LoadLibrary failed". Yes, I'm using socket API with different unicode/ansi version. At first I had only the ansi version, but it gave me some problems with ext chars; also I don't know where to convert from unicode to ANSI, because the VC++ Wizard declares the called function using "LPCTSTR"...

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Thank you!!! It was so obvious, that I couldn't find it :)

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