WinAPI Wrapper for GetOpenFileName

Shell32.dll provides an undocumented API that wraps around a call to GetOpenFileName called GetFileNameFromBrowse we’ll have to get the call pointer using GetProcAddress, quite easy to use! 😉 Well I can see the documentation in MSDN but can’t find the prototype in any of the header file in my SDK folder, so till then GetProcAddress is our refuge. As per MSDN prototype can be found in shlobj.h…

int _tmain()
{
    // Creates a typedef
    typedef BOOL ( WINAPI *GetFileNameFromBrowse )( HWND hwnd,
                                                    LPWSTR pszFilePath,
                                                    UINT cchFilePath,
                                                    LPCWSTR pszWorkingDir,
                                                    LPCWSTR pszDefExt,
                                                    LPCWSTR pszFilters,
                                                    LPCWSTR szTitle );   

    // Path buffer, specifies starting directory and on successful return
    // from open dialog also holds the selected file name
    wchar_t wszPath[MAX_PATH] = L"D:\\";   

    // Load shell32 dll
    HMODULE hModule = LoadLibrary( "Shell32.dll" );
    if( !hModule )
    {
       return 1;
    }   

    // Get procedure address
    GetFileNameFromBrowse GetFileNameFromBrowsePtr = ( GetFileNameFromBrowse )GetProcAddress( hModule, "GetFileNameFromBrowse" );   

    // Show browse dialog
    if( GetFileNameFromBrowsePtr && GetFileNameFromBrowsePtr( 0, wszPath, MAX_PATH, 0, 0, L"*.*", L"Nibu Open" ))
    {
       MessageBoxW( 0, wszPath, L"You selected", MB_OK | MB_ICONINFORMATION );
    }   

    // Free loaded library
    FreeLibrary( hModule );   

    return 0;   

}// End _tmain

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Changing IP Address of a machine!

To change ip address of a machine use SetAdapterIpAddress. It’s an undocumented API found in iphlpapi.dll.

Function signature is as follows…

DWORD SetAdapterIpAddress( char *pszAdapGUID,
                           DWORD dwDHCP,
                           DWORD dwIP,
                           DWORD dwMask,
                           DWORD dwGateway );

Look here for a demo, it’s in Russian but code is in english 😉

Showing “Select Computer” dialog, with all network computers listed out!

Ever seen that “Select Computer” dialog coming up and did you wonder how to have all those computer names without writing much code. There is an undocumented exported api in “ntlanman.dll” called ServerBrowseDialogA0 which is used exactly for this purpose.

int main()
{
// Some funky stuff
    HMODULE hMod = LoadLibrary( “Kernel32.dll” );
    GetConsoleWindow GCW = (GetConsoleWindow)GetProcAddress( hMod, “GetConsoleWindow” );
    HWND hConsole = GCW();
    SetWindowText( hConsole, “Nibu” );

// The real stuff for showing the dialog starts here
    HMODULE hModule = LoadLibrary( _T( “ntlanman.dll” ));

    typedef DWORD ( WINAPI *FNNTBrowseDlg )( HWND hwnd,
                                             CHAR *pchBuffer,
                                             DWORD cchBufSize );
    FNNTBrowseDlg lpfn = 0;
    CHAR szT[MAX_PATH + 1] = { 0 };
    lpfn = ( FNNTBrowseDlg )GetProcAddress( hModule, “ServerBrowseDialogA0” );

    // Will return zero on success, now show the dialog
    const DWORD dwResult = lpfn( hConsole, szT, MAX_PATH );

// Check result
    if( !dwResult )
    {
      stringstream sStream;
      sStream < < "Selected computer name is: " << szT;       MessageBox( hConsole, sStream.str().c_str(), "Computer name", MB_OK | MB_ICONINFORMATION );     }     else     {       MessageBox( hConsole, "You didn't make any selection", "Computer name", MB_OK | MB_ICONINFORMATION );     }     FreeLibrary( hModule );     FreeLibrary( hMod ); return 0; }// End main[/sourcecode] Output:

Changing console application window icon at runtime!

Bored with the old black icon that you have on the main window. Here is a way to change it. There is an undocumented API called SetConsoleIcon and it’s in Kernel32.dll.  Here is how we use it…

void ChangeIcon( const HICON hNewIcon )
{
   // Load kernel 32 library
   HMODULE hMod = LoadLibrary( _T( "Kernel32.dll" ));
   ASSERT( hMod ); 

   // Load console icon changing procedure
   typedef DWORD ( __stdcall *SCI )( HICON );
   SCI pfnSetConsoleIcon = reinterpret_cast<sci>( GetProcAddress( hMod, "SetConsoleIcon" ));
   ASSERT( pfnSetConsoleIcon ); 

   // Call function to change icon
   pfnSetConsoleIcon( hNewIcon ); 

   FreeLibrary( hMod );
}// End ChangeIcon 

// Main function
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
   int nRetCode = 0; 

   HMODULE hMainMod = GetModuleHandle( 0 );
   ASSERT( hMainMod );

   HICON hMainIcon = ::LoadIcon( hMainMod, MAKEINTRESOURCE( IDI_ICON3 ));
   ASSERT( hMainIcon ); 

   // Change main window icon
   ChangeIcon( hMainIcon );

   // To reset to old icon uncomment this code
   // ChangeIcon( 0 );

   return nRetCode;
}

MessageBoxTimeout

I found this pretty cool 😉

http://www.codeproject.com/cpp/MessageBoxTimeout.asp