同在一个DLL中,单独的一个数据模块,为什么数据集控件连接到它的并且打开的时候出现“missing Connection or ConnectionString”错误??在我DLL项目里有一个共用的数据模块,里面就一个ADOConnection,其他的窗体上的数据集ADOQuery都是连的它,在设计时期,ADOQuery都可以打开,而且可以看到里面的字段和数据,为什么程序一运行过后,再打开ADOQuery的时候就显示“missing Connection or ConnectionString”的错误?如果我把ADOConnection放到当前数据集所在的窗体上就不会了!是不是DLL里面用数据模块还有什么规则啊?查过很多资料,可就是解决不了!大家帮我看看!!在线等!!
在DLL的接口函数中我有创建数据模块,代码如下:library DLL;{ 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
Windows,
SysUtils,
forms,
Classes,
ActiveX,
dll_pds_Unit in 'dll_pds_Unit.pas' {pds},
dll_cache_Unit in 'dll_cache_Unit.pas' {cache: TDataModule};{$R *.res}
var
DLLApp: TApplication;
DLLScr: TScreen;procedure CreateDllForm(App: TApplication; Scr: TScreen); stdcall;
begin
Application := App;
Screen := Scr;
cache := Tcache.Create(nil);
//Application.CreateForm(Tcache, cache);这种方法也用过
mdi := Tmdi.Create(application);
mdi.Show;
end;procedure ExitDLL(Reason: Integer);
begin
if Reason = DLL_PROCESS_DETACH then
begin
Application := DLLApp;
Screen := DLLScr;
end;
end;exports
CreateDllForm;begin
DLLApp := Application;
DLLScr := Screen;
CoInitialize(nil);
DLLProc := @ExitDLL;
end.
//Application.CreateForm(Tcache, cache);这种方法也用过 cache就是数据模块窗体
cache := Tcache.Create(nil);
//Application.CreateForm(Tcache, cache);这种方法也用过
mdi := Tmdi.Create(application); mdi.query1.connet... := cache.adoconnection这样试验下