Debugging win32 dll

  • Thread starter Thread starter Steve Long
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Steve Long

Hello,
I have developed a small win32 dll in C++ and exported a function from it
using a DEF file. I'm using the DllImport attribute to import this function.
I've tested the function in a vsc++ console app, (just the code not as a
dll), and it works as expected. However, I'm having some trouble using it
from my C# app. Is there a way I can step into the imported function from
C#?

I appreciate any help I can get on this one.
Thanks
Steve
 
Steve,

Are you sure it is not in your delcaration in C# that could be the
issue? What is the declaration in C++ and what is the declaration in C#?

Also, you can debug it by adding the project to the solution I believe,
and making sure the debug version of the dll is the one that is bound to by
..NET.

Hope this helps.
 
Hi Nicholas. I'm getting into the function in the dll I know because it is
creating a log file. It's just not getting any further than that and I can't
figure out why because it's not actually logging anything, just creating the
file.

I'll see if I can step in the way you are suggesting.

Thanks
Steve

Nicholas Paldino said:
Steve,

Are you sure it is not in your delcaration in C# that could be the
issue? What is the declaration in C++ and what is the declaration in C#?

Also, you can debug it by adding the project to the solution I believe,
and making sure the debug version of the dll is the one that is bound to by
.NET.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Steve Long said:
Hello,
I have developed a small win32 dll in C++ and exported a function from it
using a DEF file. I'm using the DllImport attribute to import this
function.
I've tested the function in a vsc++ console app, (just the code not as a
dll), and it works as expected. However, I'm having some trouble using it
from my C# app. Is there a way I can step into the imported function from
C#?

I appreciate any help I can get on this one.
Thanks
Steve
Click to expand...
Click to expand...
 
Nicholas, I don't know if you're still listening to this thread or not but I
was able to finally get back to this project after being called off for a
bit.
Here's what I found out.
I added the C++ project to my C# project/solution. I changed to [DllImport]
statement to look like this:

[DllImport(@"C:\Projects2003\C++\CCArcSDELib\Debug\CCArcSDELib.dll")]
This reflects the location of the debug compiled dll.

The declaration in my C# project looks like:
public static extern long AddPoint([MarshalAs(UnmanagedType.LPTStr)] string
server,
[MarshalAs(UnmanagedType.LPTStr)] string instance,
[MarshalAs(UnmanagedType.LPTStr)] string database,
[MarshalAs(UnmanagedType.LPTStr)] string user,
[MarshalAs(UnmanagedType.LPTStr)] string pwd,
ESRIPOINT pt,
[MarshalAs(UnmanagedType.LPTStr)] string table,
FIELD_VAL[] vals,
int numFields);

structs:

public struct ESRIPOINT{
public double x;
public double y;
}

public struct FIELD_VAL{
public int field_type;
public string field;
public string fldval;
}


The C++ prototype looks like:
long __stdcall AddPoint(LPCTSTR server, LPCTSTR instance, LPCTSTR database,
LPCTSTR user, LPCTSTR pwd, ESRIPOINT
pnt, LPCTSTR table,
FIELD_VAL fldVals[], int numFields);

structs:

typedef struct{
int field_type;
CHAR* field;
CHAR* value;
} FIELD_VAL;

typedef struct{
double x;
double y;
}ESRIPOINT;

However, the debugger is not stepping into the C++ project still. I'm not
sure how to make that happen. I know, at least some, of the code is being
reached as it's creating a log file that is coded to create in the
implemented function body. But then, things break down and I can't tell why.

Any more help? Should I repost?
Steve

Nicholas Paldino said:
Steve,

Are you sure it is not in your delcaration in C# that could be the
issue? What is the declaration in C++ and what is the declaration in C#?

Also, you can debug it by adding the project to the solution I believe,
and making sure the debug version of the dll is the one that is bound to by
.NET.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Steve Long said:
Hello,
I have developed a small win32 dll in C++ and exported a function from it
using a DEF file. I'm using the DllImport attribute to import this
function.
I've tested the function in a vsc++ console app, (just the code not as a
dll), and it works as expected. However, I'm having some trouble using it
from my C# app. Is there a way I can step into the imported function from
C#?

I appreciate any help I can get on this one.
Thanks
Steve
Click to expand...
Click to expand...
 
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