“如果DLL中用到了DELPHI的string类型，则DLL和主程序中都需要加上ShareMem”。DLL项目加ShareMem这个我知道，但主程序中也要加？这我就不明白了，为什么以前不加的时候没这个问题呢？加就加吧，果然加上后一点问题都没有。唉，真是搞不明白。最后在新建DLL项目时，DELPHI有一段注释给了我答案。
library MyDll;
{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }
uses
ShareMem,
SysUtils,
Controls,
Forms;
{$R *.res}
begin
end.
http://blog.csdn.net/hhf383530895/archive/2009/11/24/4861309.aspx
