How to explicitly load a Dll in C++?

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Freedom Fighters

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Joined: 2nd Nov 2009

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Posted: 21st May 2010 04:38 Edited at: 8th Jun 2010 10:45

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ok, i have written two dlls for GDK but i would like to be able to load then from sub folders not in the general area of the exe.
Eg: Load dll from "Data\\dlls\\<DllName>.dll"
not
"<DllName>.dll" <- general area of the exe.

Quote: "well you use LoadLibrary, GetProcAddrrees..etc""

i already know these functions. but how do i use them.

see i making a class that you can use to call the functions which call the functions from the dll.

but say i have like 20 functions. how would i call each and load them all?
so each time i call the function-> then call the function from the dll-> Dll funtcion

i have seen examples on how to load one function but not multiple.

so how can i do this?

please explain it to me, still learning c++.

Cheers.

EDIT: PROBLEM SOLVED, SEE LAST POST FOR SOURCE

Problem Solution That Never Fails: "Build A Bridge And Get Over It"

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Sven B

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Joined: 5th Jan 2005

Location: Belgium

Posted: 22nd May 2010 01:10

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I might not be the best C++ teacher out here, but here goes:

To load the library you indeed use LoadLibrary(). It returns a handle to that library.

HMODULE Library = LoadLibrary("MyDLL.dll");

Then you first define the function pointer using the following syntax:
ReturnType (*FunctionName)(parameters);
eg.
int (*GetSum)(int,int);

Then you need to get the decorated names of the functions you want to load. I usually open the DLL file in notepad and CTRL+F the function to find the decorated name (they are separated by a space). The decorated names are dependent on how they are exported, but you'll notice once you search in the file.
eg. "?GetExist@@YA_NH@Z" or "_CleanD3D@0"

Then you use GetProcAdress() to get the function pointer as followed:
GetSum = (int(*)(int,int)) GetProcAddress(Library, "_DecoratedFunction@1");
(GetProcAddress returns a FARPROC type, so you have to cast it to your function prototype).

After you loaded it, you can call the function using GetSum(a, b); like any other function.

I hope this helps.

Cheers!
Sven B

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Freedom Fighters

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Posted: 25th May 2010 10:51 Edited at: 25th May 2010 10:56

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Ok, well so far i have written the code but i an having an issue loading the 'DLL' for what reason ever it wont load.

To load the dll

+ Code Snippet

if ((UdpDll = LoadLibrary((LPCWSTR)"FreedomFighters - UDP_Network_dll"))!=NULL) { //Load Functions.... }

i checked the file name and tried it with '.dll' and with out '.dll', either way it wont load. it just returns '0' or 'NULL'.

i have no clue what the problem is. 'UdpDll' is defined as a 'HMODULE', i even tried it with 'HINSTANCE'

im using a class to load it. this is the class to load the DLL

'FF_UdpDll.h"

#pragma once
class CUdpDll
{
	char SubFolder[MAX_PATH];
	HMODULE UdpDll;
	bool DllIsLoaded;
	//Dll Calls
	//dll end calls
public: //Functions
	CUdpDll(char* Dir,char* FileName);
	~CUdpDll();
	bool IsDllLoaded();	
	//Sockers
	int UdpConnect(int Port,int Mode);
	int Close_Socket(int sockid);
	//Message Send/Rec
	int Message_Send(int sockid, char*ip, int port, int buffid);
	int Message_Recieve(int sockid, int len, int buffid);
	// Socket Tools
	char* GetHostIp(char*host);
	char* GetMyHost();
	char* GetMyIp();
	char* GetMacAddress();
	int Buffer_Create();
	int Buffer_Free(int BufferId);
	// Write to buffer
	double Buffer_WriteByte(unsigned char val, int buffid);
	double Buffer_WriteShort(double val, int buffid);
	double Buffer_WriteUshort(double val, int buffid);
	double Buffer_WriteInt(double val, int buffid);
	double Buffer_WriteUnInt(double val, int buffid);
	double Buffer_WriteFloat(double val, int buffid);
	double Buffer_WriteDouble(double val, int buffid);
	double Buffer_WriteChars(char*str, int buffid);
	double Buffer_WriteString(char*str, int buffid);
	//////////////////////////////////////
	// Read From the buffer
	double Buffer_ReadByte(int buffid);
	double Buffer_ReadShort(int buffid);
	double Buffer_ReaduShort(int buffid);
	double Buffer_ReadInt(int buffid);
	double Buffer_ReaduInt(int buffid);
	double Buffer_ReadFloat(int buffid);
	double Buffer_ReadDouble(int buffid);
	char* Buffer_ReadChars(double len, int buffid);
	char* Buffer_ReadString(int buffid);
	//Buffer Tools
	double Buffer_Size(double buffid);
	double Buffer_SetPos(int SetPos,int BufferId);
	void Buffer_Clear(int BufferId);
	int Buffer_Size(int BufferId);
};

+ Code Snippet

#pragma once
class CUdpDll
{
	char SubFolder[MAX_PATH];
	HMODULE UdpDll;
	bool DllIsLoaded;
	//Dll Calls
	//dll end calls
public: //Functions
	CUdpDll(char* Dir,char* FileName);
	~CUdpDll();
	bool IsDllLoaded();	
	//Sockers
	int UdpConnect(int Port,int Mode);
	int Close_Socket(int sockid);
	//Message Send/Rec
	int Message_Send(int sockid, char*ip, int port, int buffid);
	int Message_Recieve(int sockid, int len, int buffid);
	// Socket Tools
	char* GetHostIp(char*host);
	char* GetMyHost();
	char* GetMyIp();
	char* GetMacAddress();
	int Buffer_Create();
	int Buffer_Free(int BufferId);
	// Write to buffer
	double Buffer_WriteByte(unsigned char val, int buffid);
	double Buffer_WriteShort(double val, int buffid);
	double Buffer_WriteUshort(double val, int buffid);
	double Buffer_WriteInt(double val, int buffid);
	double Buffer_WriteUnInt(double val, int buffid);
	double Buffer_WriteFloat(double val, int buffid);
	double Buffer_WriteDouble(double val, int buffid);
	double Buffer_WriteChars(char*str, int buffid);
	double Buffer_WriteString(char*str, int buffid);
	//////////////////////////////////////
	// Read From the buffer
	double Buffer_ReadByte(int buffid);
	double Buffer_ReadShort(int buffid);
	double Buffer_ReaduShort(int buffid);
	double Buffer_ReadInt(int buffid);
	double Buffer_ReaduInt(int buffid);
	double Buffer_ReadFloat(int buffid);
	double Buffer_ReadDouble(int buffid);
	char* Buffer_ReadChars(double len, int buffid);
	char* Buffer_ReadString(int buffid);
	//Buffer Tools
	double Buffer_Size(double buffid);
	double Buffer_SetPos(int SetPos,int BufferId);
	void Buffer_Clear(int BufferId);
	int Buffer_Size(int BufferId);
};

FF_UdpDll.cpp

#include "stdafx.h"
////////////////////////////////////
// Functions Define
int (*dll_UdpConnect)(int,int);
int (*dll_UdpCloseSock)(int);
int (*dll_Message_Send)(int,char*,int,int);
int (*dll_Message_Recieve)(int,int,int);
char* (*dll_GetHostIp)(char*);
char* (*dll_GetMyHost)();
char* (*dll_GetMyIp)();
char* (*dll_GetMacAddress)();
int   (*dll_Buffer_Create)();
int   (*dll_Buffer_Free)(int);
double (*dll_Buffer_WriteByte)(unsigned char, int );
double (*dll_Buffer_WriteShort)(double, int );
double (*dll_Buffer_WriteUshort)(double, int);
double (*dll_Buffer_WriteInt)(double, int );
double (*dll_Buffer_WriteUnInt)(double, int );
double (*dll_Buffer_WriteFloat)(double, int );
double (*dll_Buffer_WriteDouble)(double, int );
double (*dll_Buffer_WriteChars)(char*, int);
double (*dll_Buffer_WriteString)(char*, int);
double (*dll_Buffer_ReadByte)(int);
double (*dll_Buffer_ReadShort)(int);
double (*dll_Buffer_ReaduShort)(int);
double (*dll_Buffer_ReadInt)(int);
double (*dll_Buffer_ReaduInt)(int);
double (*dll_Buffer_ReadFloat)(int);
double (*dll_Buffer_ReadDouble)(int);
char* (*dll_Buffer_ReadChars)(double, int);
char* (*dll_Buffer_ReadString)(int);
double (*dll_Buffer_Size)(double);
double (*dll_Buffer_SetPos)(int,int);
void (*dll_Buffer_Clear)(int);
////////////////////////////////////
// Functions
void CUdpDll::DllLoad(char* Dir,char* FileName)
{
	bool Loaded = false;
	char Buffer[64];
	if (FileName=="" || "0")
	{FileName="FreedomFighters - UDP_Network_dll";}
	//load dlls
	sprintf_s(Buffer,"%s%s",Dir,FileName);
	//check if it works
	UdpDll = LoadLibrary((LPCWSTR) SubFolder );
	if (UdpDll!=NULL)
	{Loaded=true;}
	else if ((UdpDll = LoadLibrary((LPCWSTR) FileName ))!=NULL)
	{Loaded=true;}
	else if ((UdpDll = LoadLibrary((LPCWSTR)"FreedomFighters - UDP_Network_dll"))!=NULL)
	{Loaded=true;}
	//load dll if worked
	if (Loaded)
	{
		DllIsLoaded = true;
		//set the dll calls
		dll_UdpConnect = (int(*)(int,int))GetProcAddress(UdpDll,"FF_UdpConnect");
		dll_UdpCloseSock = (int(*)(int))GetProcAddress(UdpDll,"FF_Close_Socket");
		//Messages
		dll_Message_Send = (int(*)(int,char*,int,int))GetProcAddress(UdpDll,"FF_Message_Send");
		dll_Message_Recieve = (int(*)(int,int,int))GetProcAddress(UdpDll,"FF_Message_Recieve");
		//Get Info Tools
		dll_GetHostIp = (char*(*)(char*))GetProcAddress(UdpDll,"FF_GetHostIp");
		dll_GetMyHost = (char*(*)())GetProcAddress(UdpDll,"FF_GetMyHost");
		dll_GetMyIp = (char*(*)())GetProcAddress(UdpDll,"FF_GetMyIp");
		dll_GetMacAddress = (char*(*)())GetProcAddress(UdpDll,"FF_GetMacAddress");
		//Buffer
		dll_Buffer_Create = (int(*)())GetProcAddress(UdpDll,"FF__Buffer_Create");
		dll_Buffer_Free = (int(*)(int))GetProcAddress(UdpDll,"FF_Buffer_Free");
		// Buffer Write
		dll_Buffer_WriteByte = (double(*)(unsigned char, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteByte");
		dll_Buffer_WriteShort = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteShort");
		dll_Buffer_WriteUshort = (double(*)(double, int))GetProcAddress(UdpDll,"FF_Buffer_WriteUshort");
		dll_Buffer_WriteInt = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteInt");
		dll_Buffer_WriteUnInt = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteUnInt");
		dll_Buffer_WriteFloat = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteFloat");
		dll_Buffer_WriteDouble = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteDouble");
		dll_Buffer_WriteChars = (double(*)(char*, int))GetProcAddress(UdpDll,"FF_Buffer_WriteChars");
		dll_Buffer_WriteString = (double(*)(char*, int))GetProcAddress(UdpDll,"FF_Buffer_WriteString");
		// Buffer Read
		dll_Buffer_ReadByte = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadByte");
		dll_Buffer_ReadShort = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadShort");
		dll_Buffer_ReaduShort = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReaduShort");
		dll_Buffer_ReadInt = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadInt");
		dll_Buffer_ReaduInt = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReaduInt");
		dll_Buffer_ReadFloat = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadFloat");
		dll_Buffer_ReadDouble = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadDouble");
		dll_Buffer_ReadChars = (char*(*)(double, int))GetProcAddress(UdpDll,"FF_Buffer_ReadChars");
		dll_Buffer_ReadString = (char*(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadString");;
		// Buffer Tools
		dll_Buffer_Size = (double(*)(double))GetProcAddress(UdpDll,"FF_Buffer_Size");;
		dll_Buffer_SetPos = (double(*)(int,int))GetProcAddress(UdpDll,"FF_Buffer_SetPos");;
		dll_Buffer_Clear = (void(*)(int))GetProcAddress(UdpDll,"FF_Buffer_Clear");;
		//End of loading Commands
	}
	else
	{
		DllIsLoaded = false;
	}
}
void CUdpDll::DllUnLoad()
{
	if (DllIsLoaded)
	{
		FreeLibrary(UdpDll);
	}
}
bool CUdpDll::IsDllLoaded()
{
	return DllIsLoaded;
}
//Sockers
int CUdpDll::UdpConnect(int Port,int Mode)
{
	return dll_UdpConnect(Port,Mode);
}
int CUdpDll::Close_Socket(int sockid)
{
	return dll_UdpCloseSock(sockid);
}
//Message Send/Rec
int CUdpDll::Message_Send(int sockid, char*ip, int port, int buffid)
{
	return dll_Message_Send(sockid,ip,port,buffid);
}
int CUdpDll::Message_Recieve(int sockid, int len, int buffid)
{
	return dll_Message_Recieve(sockid,len,buffid);
}
// Socket Tools
char* CUdpDll::GetHostIp(char*host)
{
	return dll_GetHostIp(host);
}
char* CUdpDll::GetMyHost()
{
	return dll_GetMyHost();
}
char* CUdpDll::GetMyIp()
{
	return dll_GetMyIp();
}
char* CUdpDll::GetMacAddress()
{
	return dll_GetMacAddress();
}
int CUdpDll::Buffer_Create()
{
	return dll_Buffer_Create();
}
int CUdpDll::Buffer_Free(int BufferId)
{
	return dll_Buffer_Free(BufferId);	
}
// Write to buffer
double CUdpDll::Buffer_WriteByte(unsigned char val, int buffid)
{
	return dll_Buffer_WriteByte(val,buffid);
}
double CUdpDll::Buffer_WriteShort(double val, int buffid)
{
	return dll_Buffer_WriteShort(val,buffid);
}
double CUdpDll::Buffer_WriteUshort(double val, int buffid)
{
	return dll_Buffer_WriteUshort(val,buffid);
}
double CUdpDll::Buffer_WriteInt(double val, int buffid)
{
	return dll_Buffer_WriteInt(val,buffid);
}
double CUdpDll::Buffer_WriteUnInt(double val, int buffid)
{
	return dll_Buffer_WriteUnInt(val,buffid);
}
double CUdpDll::Buffer_WriteFloat(double val, int buffid)
{
	return dll_Buffer_WriteFloat(val,buffid);
}
double CUdpDll::Buffer_WriteDouble(double val, int buffid)
{
	return dll_Buffer_WriteDouble(val,buffid);
}
double CUdpDll::Buffer_WriteChars(char*str, int buffid)
{
	return dll_Buffer_WriteChars(str,buffid);
}
double CUdpDll::Buffer_WriteString(char*str, int buffid)
{
	return dll_Buffer_WriteString(str,buffid);
}
//////////////////////////////////////
// Read From the buffer
double CUdpDll::Buffer_ReadByte(int buffid)
{
	return dll_Buffer_ReadByte(buffid);
}
double CUdpDll::Buffer_ReadShort(int buffid)
{
	return dll_Buffer_ReadShort(buffid);
}
double CUdpDll::Buffer_ReaduShort(int buffid)
{
	return dll_Buffer_ReaduShort(buffid);
}
double CUdpDll::Buffer_ReadInt(int buffid)
{
	return dll_Buffer_ReadInt(buffid);
}
double CUdpDll::Buffer_ReaduInt(int buffid)
{
	return dll_Buffer_ReaduInt(buffid);
}
double CUdpDll::Buffer_ReadFloat(int buffid)
{
	return dll_Buffer_ReadFloat(buffid);
}
double CUdpDll::Buffer_ReadDouble(int buffid)
{
	return dll_Buffer_ReadDouble(buffid);
}
char* CUdpDll::Buffer_ReadChars(double len, int buffid)
{
	return dll_Buffer_ReadChars(len,buffid);
}
char* CUdpDll::Buffer_ReadString(int buffid)
{
	return dll_Buffer_ReadString(buffid);
}
//Buffer Tools
double CUdpDll::Buffer_Size(double buffid)
{
	return dll_Buffer_Size(buffid);
}
double Buffer_SetPos(int SetPos,int BufferId)
{
	return dll_Buffer_SetPos(SetPos,BufferId);
}
void CUdpDll::Buffer_Clear(int BufferId)
{
	dll_Buffer_Clear(BufferId);
}

+ Code Snippet

#include "stdafx.h"
////////////////////////////////////
// Functions Define
int (*dll_UdpConnect)(int,int);
int (*dll_UdpCloseSock)(int);
int (*dll_Message_Send)(int,char*,int,int);
int (*dll_Message_Recieve)(int,int,int);
char* (*dll_GetHostIp)(char*);
char* (*dll_GetMyHost)();
char* (*dll_GetMyIp)();
char* (*dll_GetMacAddress)();
int   (*dll_Buffer_Create)();
int   (*dll_Buffer_Free)(int);
double (*dll_Buffer_WriteByte)(unsigned char, int );
double (*dll_Buffer_WriteShort)(double, int );
double (*dll_Buffer_WriteUshort)(double, int);
double (*dll_Buffer_WriteInt)(double, int );
double (*dll_Buffer_WriteUnInt)(double, int );
double (*dll_Buffer_WriteFloat)(double, int );
double (*dll_Buffer_WriteDouble)(double, int );
double (*dll_Buffer_WriteChars)(char*, int);
double (*dll_Buffer_WriteString)(char*, int);
double (*dll_Buffer_ReadByte)(int);
double (*dll_Buffer_ReadShort)(int);
double (*dll_Buffer_ReaduShort)(int);
double (*dll_Buffer_ReadInt)(int);
double (*dll_Buffer_ReaduInt)(int);
double (*dll_Buffer_ReadFloat)(int);
double (*dll_Buffer_ReadDouble)(int);
char* (*dll_Buffer_ReadChars)(double, int);
char* (*dll_Buffer_ReadString)(int);
double (*dll_Buffer_Size)(double);
double (*dll_Buffer_SetPos)(int,int);
void (*dll_Buffer_Clear)(int);
////////////////////////////////////
// Functions
void CUdpDll::DllLoad(char* Dir,char* FileName)
{
	bool Loaded = false;
	char Buffer[64];
	if (FileName=="" || "0")
	{FileName="FreedomFighters - UDP_Network_dll";}
	//load dlls
	sprintf_s(Buffer,"%s%s",Dir,FileName);
	//check if it works
	UdpDll = LoadLibrary((LPCWSTR) SubFolder );
	if (UdpDll!=NULL)
	{Loaded=true;}
	else if ((UdpDll = LoadLibrary((LPCWSTR) FileName ))!=NULL)
	{Loaded=true;}
	else if ((UdpDll = LoadLibrary((LPCWSTR)"FreedomFighters - UDP_Network_dll"))!=NULL)
	{Loaded=true;}
	//load dll if worked
	if (Loaded)
	{
		DllIsLoaded = true;
		//set the dll calls
		dll_UdpConnect = (int(*)(int,int))GetProcAddress(UdpDll,"FF_UdpConnect");
		dll_UdpCloseSock = (int(*)(int))GetProcAddress(UdpDll,"FF_Close_Socket");
		//Messages
		dll_Message_Send = (int(*)(int,char*,int,int))GetProcAddress(UdpDll,"FF_Message_Send");
		dll_Message_Recieve = (int(*)(int,int,int))GetProcAddress(UdpDll,"FF_Message_Recieve");
		//Get Info Tools
		dll_GetHostIp = (char*(*)(char*))GetProcAddress(UdpDll,"FF_GetHostIp");
		dll_GetMyHost = (char*(*)())GetProcAddress(UdpDll,"FF_GetMyHost");
		dll_GetMyIp = (char*(*)())GetProcAddress(UdpDll,"FF_GetMyIp");
		dll_GetMacAddress = (char*(*)())GetProcAddress(UdpDll,"FF_GetMacAddress");
		//Buffer
		dll_Buffer_Create = (int(*)())GetProcAddress(UdpDll,"FF__Buffer_Create");
		dll_Buffer_Free = (int(*)(int))GetProcAddress(UdpDll,"FF_Buffer_Free");
		// Buffer Write
		dll_Buffer_WriteByte = (double(*)(unsigned char, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteByte");
		dll_Buffer_WriteShort = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteShort");
		dll_Buffer_WriteUshort = (double(*)(double, int))GetProcAddress(UdpDll,"FF_Buffer_WriteUshort");
		dll_Buffer_WriteInt = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteInt");
		dll_Buffer_WriteUnInt = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteUnInt");
		dll_Buffer_WriteFloat = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteFloat");
		dll_Buffer_WriteDouble = (double(*)(double, int ))GetProcAddress(UdpDll,"FF_Buffer_WriteDouble");
		dll_Buffer_WriteChars = (double(*)(char*, int))GetProcAddress(UdpDll,"FF_Buffer_WriteChars");
		dll_Buffer_WriteString = (double(*)(char*, int))GetProcAddress(UdpDll,"FF_Buffer_WriteString");
		// Buffer Read
		dll_Buffer_ReadByte = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadByte");
		dll_Buffer_ReadShort = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadShort");
		dll_Buffer_ReaduShort = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReaduShort");
		dll_Buffer_ReadInt = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadInt");
		dll_Buffer_ReaduInt = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReaduInt");
		dll_Buffer_ReadFloat = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadFloat");
		dll_Buffer_ReadDouble = (double(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadDouble");
		dll_Buffer_ReadChars = (char*(*)(double, int))GetProcAddress(UdpDll,"FF_Buffer_ReadChars");
		dll_Buffer_ReadString = (char*(*)(int))GetProcAddress(UdpDll,"FF_Buffer_ReadString");;
		// Buffer Tools
		dll_Buffer_Size = (double(*)(double))GetProcAddress(UdpDll,"FF_Buffer_Size");;
		dll_Buffer_SetPos = (double(*)(int,int))GetProcAddress(UdpDll,"FF_Buffer_SetPos");;
		dll_Buffer_Clear = (void(*)(int))GetProcAddress(UdpDll,"FF_Buffer_Clear");;
		//End of loading Commands
	}
	else
	{
		DllIsLoaded = false;
	}
}
void CUdpDll::DllUnLoad()
{
	if (DllIsLoaded)
	{
		FreeLibrary(UdpDll);
	}
}
bool CUdpDll::IsDllLoaded()
{
	return DllIsLoaded;
}
//Sockers
int CUdpDll::UdpConnect(int Port,int Mode)
{
	return dll_UdpConnect(Port,Mode);
}
int CUdpDll::Close_Socket(int sockid)
{
	return dll_UdpCloseSock(sockid);
}
//Message Send/Rec
int CUdpDll::Message_Send(int sockid, char*ip, int port, int buffid)
{
	return dll_Message_Send(sockid,ip,port,buffid);
}
int CUdpDll::Message_Recieve(int sockid, int len, int buffid)
{
	return dll_Message_Recieve(sockid,len,buffid);
}
// Socket Tools
char* CUdpDll::GetHostIp(char*host)
{
	return dll_GetHostIp(host);
}
char* CUdpDll::GetMyHost()
{
	return dll_GetMyHost();
}
char* CUdpDll::GetMyIp()
{
	return dll_GetMyIp();
}
char* CUdpDll::GetMacAddress()
{
	return dll_GetMacAddress();
}
int CUdpDll::Buffer_Create()
{
	return dll_Buffer_Create();
}
int CUdpDll::Buffer_Free(int BufferId)
{
	return dll_Buffer_Free(BufferId);	
}
// Write to buffer
double CUdpDll::Buffer_WriteByte(unsigned char val, int buffid)
{
	return dll_Buffer_WriteByte(val,buffid);
}
double CUdpDll::Buffer_WriteShort(double val, int buffid)
{
	return dll_Buffer_WriteShort(val,buffid);
}
double CUdpDll::Buffer_WriteUshort(double val, int buffid)
{
	return dll_Buffer_WriteUshort(val,buffid);
}
double CUdpDll::Buffer_WriteInt(double val, int buffid)
{
	return dll_Buffer_WriteInt(val,buffid);
}
double CUdpDll::Buffer_WriteUnInt(double val, int buffid)
{
	return dll_Buffer_WriteUnInt(val,buffid);
}
double CUdpDll::Buffer_WriteFloat(double val, int buffid)
{
	return dll_Buffer_WriteFloat(val,buffid);
}
double CUdpDll::Buffer_WriteDouble(double val, int buffid)
{
	return dll_Buffer_WriteDouble(val,buffid);
}
double CUdpDll::Buffer_WriteChars(char*str, int buffid)
{
	return dll_Buffer_WriteChars(str,buffid);
}
double CUdpDll::Buffer_WriteString(char*str, int buffid)
{
	return dll_Buffer_WriteString(str,buffid);
}
//////////////////////////////////////
// Read From the buffer
double CUdpDll::Buffer_ReadByte(int buffid)
{
	return dll_Buffer_ReadByte(buffid);
}
double CUdpDll::Buffer_ReadShort(int buffid)
{
	return dll_Buffer_ReadShort(buffid);
}
double CUdpDll::Buffer_ReaduShort(int buffid)
{
	return dll_Buffer_ReaduShort(buffid);
}
double CUdpDll::Buffer_ReadInt(int buffid)
{
	return dll_Buffer_ReadInt(buffid);
}
double CUdpDll::Buffer_ReaduInt(int buffid)
{
	return dll_Buffer_ReaduInt(buffid);
}
double CUdpDll::Buffer_ReadFloat(int buffid)
{
	return dll_Buffer_ReadFloat(buffid);
}
double CUdpDll::Buffer_ReadDouble(int buffid)
{
	return dll_Buffer_ReadDouble(buffid);
}
char* CUdpDll::Buffer_ReadChars(double len, int buffid)
{
	return dll_Buffer_ReadChars(len,buffid);
}
char* CUdpDll::Buffer_ReadString(int buffid)
{
	return dll_Buffer_ReadString(buffid);
}
//Buffer Tools
double CUdpDll::Buffer_Size(double buffid)
{
	return dll_Buffer_Size(buffid);
}
double Buffer_SetPos(int SetPos,int BufferId)
{
	return dll_Buffer_SetPos(SetPos,BufferId);
}
void CUdpDll::Buffer_Clear(int BufferId)
{
	dll_Buffer_Clear(BufferId);
}

Problem Solution That Never Fails: "Build A Bridge And Get Over It"

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Sven B

20

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Joined: 5th Jan 2005

Location: Belgium

Posted: 25th May 2010 18:12

Link

And you're sure it's in the right directory? Have you tried the full path name? Is the DLL not corrupt or did you get it to work somewhere else? I have always added .dll so it should if you add .dll.

Sorry, it's just guessing for me now too.
If you tried all these things, perhaps you can give some info on what you're using to create it. I assumed it was VC++ express.

Sven B

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IanM

Retired Moderator

22

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 26th May 2010 00:00

Link

Your mistake is here:

+ Code Snippet

(LPCWSTR)"FreedomFighters - UDP_Network_dll"

You are creating an 8 bit character array, then forcing the compiler to believe it's a 16 bit character pointer - that doesn't convert the characters themselves.

2 options:
1. Prefix your string literal with an uppercase L:

+ Code Snippet

L"FreedomFighters - UDP_Network_dll"

That switched it to a 16 bit literal string.

2. Switch your DLL to 8 bit characters, not unicode. This is 'better' for DBPro plug-ins as DBPro uses an 8 bit character system only.

Utility plug-ins collection (updated 02 Mar 2010) and
http://www.matrix1.demon.co.uk

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Freedom Fighters

15

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Joined: 2nd Nov 2009

Location:

Posted: 26th May 2010 14:16

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Quote: "Your mistake is here:
+ Code Snippet

(LPCWSTR)"FreedomFighters - UDP_Network_dll"

You are creating an 8 bit character array, then forcing the compiler to believe it's a 16 bit character pointer - that doesn't convert the characters themselves.

2 options:
1. Prefix your string literal with an uppercase L:
+ Code Snippet

L"FreedomFighters - UDP_Network_dll"

That switched it to a 16 bit literal string.

2. Switch your DLL to 8 bit characters, not unicode. This is 'better' for DBPro plug-ins as DBPro uses an 8 bit character system only."

Yep, this fixed the problem. but now when i got to call one of the functions it comes up with a error: 'access violation' im trying to work out what could be causing the isssue.

i am using visual c++ 2010

Problem Solution That Never Fails: "Build A Bridge And Get Over It"

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Freedom Fighters

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Years of Service

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Joined: 2nd Nov 2009

Location:

Posted: 8th Jun 2010 11:04

Link

[PROBLEM SOLVED!

]

ok, i solved the problem and now it all works. ;P

to help others i will release my source for loading the dll and calling it.

*Note: this will not include the source for the dll.

Enjoy.

Note*: The Project is in Visual Studio 2010 C++ Sorry.

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DLL Talk / How to explicitly load a Dll in C++?

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