|
|
[CLibraryFuncExtractor : Extract functions from DLL's ] | ||
Environment: Win 95/98 VC6 SP4 The class is derived and uses the functionality within CLoadLibrary
3 types of constructors are found: all send given parameters to base class.
(do read this class and documenrtation Here)
Here are 2 screens of available project : The 2 screens display
the library path that was selected (on top) ,
When a function is selected from the combobox , its' name and address are displayed
within the 2 static controls on bottom.
CLibraryFuncExtractor() : CLoadLibrary() { }
// 2 constructors calling base constructor
CLibraryFuncExtractor(LPCTSTR lpszFileName) : CLoadLibrary(lpszFileName) { }
CLibraryFuncExtractor(LPCTSTR lpszFileName,BOOL bSystemDirectory,BOOL bWindowsDirectory)
: CLoadLibrary(lpszFileName,bSystemDirectory,bWindowsDirectory) { }
The class allows you to insert multiple number of functions
in 1 step , or a single function one by one. To use that
first : load the library you want then extract functions :
// loading library of MAPI : I want to extract 12 functions to use
// simple MAPI to send mail ,recieve , view (Simple MAPI is a small part of MAPI
BOOL bLoaded = Load(_T("Mapi32.dll"),FALSE,TRUE);
if (bLoaded) {
LPCTSTR *pFunctions = {
_T("MAPIAddress") ,_T("MapiDeleteMail")
_T("MapiDetails"),_T("MapiFreeBuffer"),
_T("MAPIFindNext"),_T("MapiLogoff"),
_T("MapiLogon"),_T("MapiReadMail"),
_T("MapiResolveName"),_T("MapiSaveMail"),
_T("MapiSendDocuments"),_T("MapiSendMail")
};
int nFound = Add(12,pFunctions);
if (nFound==12)
{ // all functions were found : therefore OK!
}
else // not all functions were found
{
}
}
Here are function declerations:
int Add(int nCount,LPCTSTR *lpszProcName);
BOOL AddProc(LPCTSTR lpszProcName,BOOL bRefreshAddress=FALSE);
You get function address by calling : GetProc() . Addresses the were already found are stored in a template
based array , so needn't look again within the library on every time you need address.
If the function doesnt already exist in array it is being looked for in the library.
FARPROC GetProc(LPCTSTR lpszProcName,BOOL bLookUpIfNotInMap=TRUE);
Beware : when library is unloaded You must assume that addresses of functions are INVALID (though the library doesn't always unload on this call)
during the lifetime of application the virtual address of library is Locked therfore
you can always use library-function-addresses
