Rubrik: COM/OLE/Registry/DLL · Sonstiges | VB-Versionen: VB5, VB6 | 27.10.04 |
Pfad der aufrufenden Anwendung ermitteln (COM-Objekt) Dieser Tipp verrät, wie man in einem COM-Objekt (bspw. ActiveX-DLL) den Pfad einer aufrufenden Anwendung ermittelt. | ||
Autor: Martoeng | Bewertung: | Views: 13.085 |
www.martoeng.de | System: Win9x, WinNT, Win2k, WinXP, Win7, Win8, Win10, Win11 | Beispielprojekt auf CD |
Den Pfad einer Anwendung ermitteln - das geht doch einfach wird sich jeder denken. Auch aus einer DLL heraus ist es noch keine Schwierigkeit.
Was aber, wenn Sie eine ActiveX-DLL geschrieben haben, und Sie den Pfad der aufrufenden, also instanzierenden Anwendung ermitteln wollen? Da hilft dieser Tipp weiter.
Option Explicit ' Benötigte API-Deklarationen Private Declare Function GetFullPathName Lib "kernel32" _ Alias "GetFullPathNameA" ( _ ByVal lpFileName As String, _ ByVal nBufferLength As Long, _ ByVal lpBuffer As String, _ ByVal lpFilePart As String) As Long Private Declare Function CreateToolhelpSnapshot Lib "kernel32" _ Alias "CreateToolhelp32Snapshot" ( _ ByVal lFlgas As Long, _ ByVal lProcessID As Long) As Long Private Declare Function ProcessFirst Lib "kernel32" _ Alias "Process32First" ( _ ByVal hSnapshot As Long, _ uProcess As PROCESSENTRY32) As Long Private Declare Function ProcessNext Lib "kernel32" _ Alias "Process32Next" ( _ ByVal hSnapshot As Long, _ uProcess As PROCESSENTRY32) As Long Private Declare Sub CloseHandle Lib "kernel32" ( _ ByVal hPass As Long) Private Declare Function GetCurrentProcessId Lib "kernel32.dll" () As Long Private Const TH32CS_SNAPPROCESS As Long = 2& Private Const MAX_PATH As Long = 260 Private Type PROCESSENTRY32 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 * MAX_PATH End Type
' Pfad der aufrufenden Anwendung ermitteln Private Function GetInstancePath() As String Dim lProcessID As Long Dim lSnapshot As Long Dim uProcess As PROCESSENTRY32 Dim lProcessFound As Long Dim i As Integer Dim sEXEName As String ' aktuelle Prozess-ID ermitteln lProcessID = GetCurrentProcessId lSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0&) ' Fehler? If lSnapshot = -1 Then Exit Function ' uProcess-Struktur füllen With uProcess .dwSize = Len(uProcess) ' alle aktiven Prozesse durchlaufen lProcessFound = ProcessFirst(lSnapshot, uProcess) Do While lProcessFound If .th32ProcessID = lProcessID Then ' ProzessID gefunden ' jetzt EXE-Name ermitteln If InStr(.szexeFile, Chr$(0)) > 0 Then sEXEName = Left$(.szexeFile, InStr(.szexeFile, Chr$(0)) - 1) End If Exit Do Else ' ...weitersuchen... lProcessFound = ProcessNext(lSnapshot, uProcess) End If Loop End With ' vollständigen Pfad ermitteln Dim nBuffer As String Dim nFilePart As String Dim nLen As Long nBuffer = Space$(255) nLen = GetFullPathName(sEXEName, Len(nBuffer), nBuffer, nFilePart) If nLen Then sEXEName = Left$(nBuffer, nLen) GetInstancePath = sEXEName End Function