PB编程实.doc

(1)获得安装的打印机??在这个例子中,我们生成一个以打印机名的下拉框 string printers[]??int rtn, i, nbPrinters??rtn = RegistryKeys ??? ?(\HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Control\\Print\\Printers\, ? ?? ?? ?printers)??nbPrinters = UpperBound(printers)??FOR i = 1 TO nbPrinters??? ? lb_1.addItem(printers[i])??NEXT (2)获得当前的用户名和机器名??在这个应用中,需要定义下面的两个API函数 FUNCTION long GetComputerNameA(ref string ComputerName, ref ulong BufferLength)? ???LIBRARY \KERNEL32.DLL\??FUNCTION long GetUserNameA(ref string UserName, ref ulong BufferLength)? ???LIBRARY \ADVAPI32.DLL\ and then??long ll_ret??string ls_ComputerName, ls_UserName??ulong BufferLength = 250??// you may need to adjust this. see Note????ls_ComputerName = Space(BufferLength)??ls_UserName? ???= Space(BufferLength)????ll_ret = GetComputerNameA(ls_ComputerName, BufferLength)??ll_ret = GetuserNameA(ls_UserName, BufferLength) 注意:通过一些实验,在使用函数GetUserNameA获得用户名时,如果定义的BUFFERLENGTH 小于实际的用户名长度,函数可能会出现异常.??(3)获得当前的目录??首先定义API函数 FUNCTION long GetCurrentDirectoryA( long length , ref string path) ????LIBRARY \Kernel32\ 接下来 long ll_ret??string ls_path????ls_path = Space(250)??ll_ret = GetCurrentDirectoryA(250, ls_path)??IF ll_ret 0 THEN??? ?ls_path = Left(ls_path,ll_ret)??? ?MessageBoxBox(\\, ls_path)??ELSE??? ?Messagebox(\Error\,\Err GetCurrentDirectory \ + String(ll_ret))??END IF (4)创建或删除目录??首先定义如下API函数 FUNCTION boolean CreateDirectoryA(ref string path, long attr)? ? ??LIBRARY \kernel32.dll\??FUNCTION boolean RemoveDirectoryA( ref string path )? ???LIBRARY \kernel32.dll\??接下来 CreateDirectoryA( \C:\\TempDir\, 0 ) // always 0??RemoveDirectoryA( \C:\\TempDir\ ) 注意:没有办法同时创建两个以上的目录.可以一个一个的创建.??(5)文件改名??使用下面的函数,把文件\移动\成一个新的名字(没有关系,不会真的移动文件,只是改名)??Simply \move\ it under a new name with the function??FUNCTION BOOLEAN MoveFileA(STRING oldfile, STRING newfile)? ???LIBRARY \Kernel32.dll\ (6)禁止ODBC的“LOGIN”窗口??在DbParm中使用如下的连接选项??Use this ConnectOption in your DbParm :??SQLCA.DBParm=\ConnectString=\DSN=myd