Could not find function 'Function Name' in Dbprocore.dll.

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Posted: 7th Mar 2009 06:43 Edited at: 7th Mar 2009 07:03

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That's the error i'm getting when trying to use my simple dll in Dbpro. Since this is a test dll most of the code is copied from these forums.

DllMain.cpp

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

// Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, int Value)
{
    // Remove the old string
    DeleteString( OldString );
    
    // Allocate a new string
    LPSTR RetString = CreateString(12); // 10 possible digits, leading sign, null terminator
    
    // Populate the new string
    sprintf(RetString, "%d", Value);
    
    // Return the new string
    return (DWORD)RetString;
}

+ Code Snippet

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

    // Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, int Value)
{
    // Remove the old string
    DeleteString( OldString );
    
    // Allocate a new string
    LPSTR RetString = CreateString(12); // 10 possible digits, leading sign, null terminator
    
    // Populate the new string
    sprintf(RetString, "%d", Value);
    
    // Return the new string
    return (DWORD)RetString;
}

RSFile.rc

+ Code Snippet

#include <winresrc.h>

STRINGTABLE 
BEGIN
    1, "TESTFUNC[%SL%Z8TestFuncPci%"
END

Head.h

+ Code Snippet

#ifndef _DLL_H_
#define _DLL_H_

# define DLLEXPORT __declspec (dllexport)



      DLLEXPORT DWORD TestFunc(LPSTR OldString, int Value);


#endif /* _DLL_H_ */

Compiled dll attached.

The header file Head.h was a last second try to get it working so it may not be needed. Please take the time to reply, thanks!

Edit:

Lol, 5 minutes after I finaly post I figure it out. my problem was that I didn't completely copy the function name from the dll for the resource file. For referance when you go to copy the function name from the dll copy everything surrounding the name on both sides until you reach a space.

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Posted: 7th Mar 2009 07:57

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Ok, so now I'm trying to do what I've been trying to do the whole time.

dllmain.cpp

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

// Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, LPSTR pFilterName, LPSTR pFilterExt)
{
    // Remove the old string
    DeleteString( OldString );
    
   	// Return string pointer
	LPSTR pRetString=NULL;

// If input string valid
	if(pFilterName)
	{
    
    char fn[MAX_PATH];
    OPENFILENAME ofn;
    LPSTR filter;
    fn[0] = '\0';
    ZeroMemory(&ofn, sizeof(OPENFILENAME));
    ofn.lStructSize = sizeof(OPENFILENAME);
    sprintf(filter, "%\0%\0",pFilterName, pFilterExt );
    ofn.lpstrFilter = filter;
    ofn.lpstrInitialDir = "C:/Program Files\0";
    ofn.Flags=OFN_OVERWRITEPROMPT;
    ofn.lpstrFile = fn;
    ofn.nMaxFile = sizeof(fn);
    GetSaveFileName(&ofn);
    
        // Allocate a new string
    LPSTR RetString = CreateString(sizeof(fn));
    
    // Populate the new string
    sprintf(RetString, "%", fn);
    
    // Return the new string
    return (DWORD)RetString;
}
}

+ Code Snippet

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

    // Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, LPSTR pFilterName, LPSTR pFilterExt)
{
    // Remove the old string
    DeleteString( OldString );
    
   	// Return string pointer
	LPSTR pRetString=NULL;
    

    // If input string valid
	if(pFilterName)
	{
    
    char fn[MAX_PATH];
    OPENFILENAME ofn;
    LPSTR filter;
    fn[0] = '\0';
    ZeroMemory(&ofn, sizeof(OPENFILENAME));
    ofn.lStructSize = sizeof(OPENFILENAME);
    sprintf(filter, "%\0%\0",pFilterName, pFilterExt );
    ofn.lpstrFilter = filter;
    ofn.lpstrInitialDir = "C:/Program Files\0";
    ofn.Flags=OFN_OVERWRITEPROMPT;
    ofn.lpstrFile = fn;
    ofn.nMaxFile = sizeof(fn);
    GetSaveFileName(&ofn);
    
        // Allocate a new string
    LPSTR RetString = CreateString(sizeof(fn));
    
    // Populate the new string
    sprintf(RetString, "%", fn);
    
    // Return the new string
    return (DWORD)RetString;
}
}

Head.h

+ Code Snippet

#ifndef _DLL_H_
#define _DLL_H_

# define DLLEXPORT __declspec (dllexport)



      DLLEXPORT DWORD TestFunc(LPSTR OldString, LPSTR pFilterName, LPSTR pFilterExt);


#endif /* _DLL_H_ */

This function crashes my program when I call it. Any ideas about what could be causing it?

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IanM

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Posted: 7th Mar 2009 16:35

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Your 'populate the new string' is incorrect. Your sprintf should have %s in the string, but I'd suggest you simply replace the line with strcpy.

Your earlier sprintf is also incorrect in pretty much the same way.

Utility plug-ins collection (updated 29/12/08) and
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Posted: 8th Mar 2009 01:37

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That didn't seem to fix my problem. Here's the new cpp file.

dllmain.cpp

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

// Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, LPSTR pFilterName, LPSTR pFilterExt)
{
    // Remove the old string
    DeleteString( OldString );
    
   	// Return string pointer
	LPSTR pRetString=NULL;

// If input string valid
	if(pFilterName)
	{
    
    char fn[MAX_PATH];
    OPENFILENAME ofn;
    LPSTR filter;
    fn[0] = '\0';
    ZeroMemory(&ofn, sizeof(OPENFILENAME));
    ofn.lStructSize = sizeof(OPENFILENAME);
    
    strcat(filter,pFilterName);
    strcat(filter,"\0");
    strcat(filter,pFilterExt);
    strcat(filter,"\0");
    
    ofn.lpstrFilter = filter;
    ofn.lpstrInitialDir = "C:/Program Files\0";
    ofn.Flags=OFN_OVERWRITEPROMPT;
    ofn.lpstrFile = fn;
    ofn.nMaxFile = sizeof(fn);
    GetSaveFileName(&ofn);
    
        // Allocate a new string
    LPSTR RetString = CreateString(sizeof(fn));
    
    // Populate the new string
    strcpy(RetString,fn);
    
    // Return the new string
    return (DWORD)RetString;
}
}

+ Code Snippet

#include <windows.h>
#include <stdio.h>

#define EXPORT     _declspec(dllexport)
#define EXPORTC    extern "C++" EXPORT

#include "globstruct.h"
#include "head.h"

// ---- SUPPORT FUNCTIONS ----
GlobStruct* GetCore()
{
    static GlobStruct* CorePtr = NULL;
    
    // If already have the core pointer, return it.
    if (CorePtr)
        return CorePtr;

    // Get the core pointer ...
    typedef GlobStruct* (__cdecl *tGetGlobPtr)(void);
    
    HINSTANCE CoreHandle = LoadLibrary("DBProCore.dll");
    tGetGlobPtr GetGlobPtr = (tGetGlobPtr)GetProcAddress( CoreHandle, "?GetGlobPtr@@YAKXZ" );
    FreeLibrary( CoreHandle );
    
    CorePtr = GetGlobPtr();
    
    // ... and return it.
    return CorePtr;
}

void DeleteString(LPCSTR OldStr)
    {
        if (OldStr)
        {
            GetCore()->CreateDeleteString( (DWORD *)&OldStr, 0);
        }
    }

LPSTR CreateString(int Size)
{
    LPSTR NewString=NULL;
    GetCore()->CreateDeleteString( (DWORD *)&NewString, Size);
    return NewString;
}

LPSTR CreateString(LPCSTR Source)
{
    return strcpy( CreateString( (int)strlen(Source)+1 ), Source );
}

// ---- User Code ----
EXPORTC DWORD TestFunc(LPSTR OldString, LPSTR pFilterName, LPSTR pFilterExt)
{
    // Remove the old string
    DeleteString( OldString );
    
   	// Return string pointer
	LPSTR pRetString=NULL;
    

    // If input string valid
	if(pFilterName)
	{
    
    char fn[MAX_PATH];
    OPENFILENAME ofn;
    LPSTR filter;
    fn[0] = '\0';
    ZeroMemory(&ofn, sizeof(OPENFILENAME));
    ofn.lStructSize = sizeof(OPENFILENAME);
    
    strcat(filter,pFilterName);
    strcat(filter,"\0");
    strcat(filter,pFilterExt);
    strcat(filter,"\0");
    
    ofn.lpstrFilter = filter;
    ofn.lpstrInitialDir = "C:/Program Files\0";
    ofn.Flags=OFN_OVERWRITEPROMPT;
    ofn.lpstrFile = fn;
    ofn.nMaxFile = sizeof(fn);
    GetSaveFileName(&ofn);
    
        // Allocate a new string
    LPSTR RetString = CreateString(sizeof(fn));
    
    // Populate the new string
    strcpy(RetString,fn);
    
    // Return the new string
    return (DWORD)RetString;
}
}

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Posted: 8th Mar 2009 02:19

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Hmm... for some reason the edit post is acting wierd. I figured out that the problem is with strcat I just don't know how to fix it. Any ideas?

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IanM

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Posted: 9th Mar 2009 19:55

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Where are you allocating the storage for this variable?

LPSTR filter;

Also, you can't append an extra null byte to a char* with strcat - you'll need to build that kind of string manually.

Utility plug-ins collection (updated 29/12/08) and
http://www.matrix1.demon.co.uk

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DLL Talk / Could not find function 'Function Name' in Dbprocore.dll.

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