Plz Help / Calling external DLL

Posted on 2008-10-19
Last Modified: 2008-11-14
Hi ! How to add a reference to the third party dll in the class ? can you please let me know by coding ..thanks
Question by:s_maha1978

Expert Comment

ID: 22752337

Author Comment

ID: 22752380
Hi THANKS< instead of dll importhow can reference that dll without adding to my current project. I mean like is there anything like Load library methods ??

Accepted Solution

Hipposaver earned 250 total points
ID: 22801647
its called "Dll Injection" heres a code; usage
MsgBox LoadDLL(DLLPath.text, ProcessName.text)

Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function GetModuleHandle Lib "kernel32" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function VirtualAllocEx Lib "kernel32" (ByVal hProcess As Long, lpAddress As Any, ByVal dwSize As Long, ByVal fAllocType As Long, FlProtect As Long) As Long
Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function CreateRemoteThread Lib "kernel32" (ByVal ProcessHandle As Long, lpThreadAttributes As Long, ByVal dwStackSize As Long, ByVal lpStartAddress As Any, ByVal lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadID As Long) As Long
Private Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long
Private Const MEM_COMMIT As Long = &H1000
Private Const PAGE_READWRITE As Long = &H4
Private Const PROCESS_ALL_ACCESS As Long = &H1F0FFF
Private Const TH32CS_SNAPPROCESS As Long = &H2
Private Const STANDARD_RIGHTS_REQUIRED As Long = &HF0000
Private Const SYNCHRONIZE As Long = &H100000
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function FindWindow Lib "USER32" Alias "FindWindowA" (ByVal Classname As String, ByVal WindowName As String) As Long
Private Declare Function GetWindowThreadProcessId Lib "USER32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function CreateToolhelpSnapshot Lib "kernel32" Alias "CreateToolhelp32Snapshot" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long
Private Declare Function Process32First Lib "kernel32" (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
Private Declare Function Process32Next Lib "kernel32" (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
Private Declare Sub CloseHandle Lib "kernel32" (ByVal hPass As Long)
    dwSize As Long
    cntUsage As Long
    th32ProcessID As Long
    th32DefaultHeapID As Long
    th32ModuleID As Long
    cntThreads As Long
    th32ParentProcessID As Long
    pcPriClassBase As Long
    dwFlags As Long
    szExeFile As String * 260
End Type
Private Function LoadDLL(DLLPath As String, EXEName As String) As Integer
Dim hAlloc As Long, hProcID As Long, hInject As Long, hLL As Long, hThread As Long
hProcID = GetProcID(EXEName)
hAlloc = VirtualAllocEx(hProcID, ByVal 0, Len(DLLPath), MEM_COMMIT, ByVal PAGE_READWRITE)
If hAlloc Then
    hInject = WriteProcessMemory(hProcID, hAlloc, ByVal DLLPath, Len(DLLPath), 0)
    If hInject Then
        hLL = GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA")
        If hLL Then
            hThread = CreateRemoteThread(hProcID, 0, 0, hLL, hAlloc, 0, 0)
            If hThread = 0 Then
                LoadDLL = 1
            End If
            LoadDLL = 2
        End If
        LoadDLL = 3
    End If
    LoadDLL = 4
End If
End Function
Public Function GetProcID(ByVal EXEName As String) As Long
Dim sEName() As String
Dim f As Long, sName As String
Dim hSnap As Long, proc As PROCESSENTRY32, hProc As Long, proc1 As PROCESSENTRY32
hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
IsRunning = False
proc.dwSize = Len(proc)
If hSnap <> 0 Then
    f = Process32First(hSnap, proc)
    Do While f
        sName = Left$(proc.szExeFile, InStr(1, proc.szExeFile, Chr(0)) - 1)
        sEName = Split(sName, "\")
        sName = sEName(UBound(sEName))
        If LCase(sName) = LCase(EXEName) Then 'lcase() for NOT case sensitive
            GetProcID = OpenProcess(PROCESS_ALL_ACCESS, False, proc.th32ProcessID)
            Exit Function
        End If
        f = Process32Next(hSnap, proc)
End If
End Function

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