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<hr><p align="left"><small>发信人: Zeemon (塞下秋), 信区: Visual <br>
标 题: Delphi3(10) <br>
发信站: BBS 水木清华站 (Tue Nov 11 20:06:07 1997) <br>
<br>
下文由idol (沉默的人)在浙大BBS西子浣纱城站发表 <br>
<br>
<br>
ActiveX <br>
------- <br>
After generating an ActiveX control, do not change the <br>
type library interface from dual interface to dispinterface. <br>
The ActiveX Class Framework does not support inheritance <br>
from dispinterface. <br>
<br>
Delphi-created ActiveX controls and ActiveForms have been <br>
tested for use with the following containers: Delphi 3, <br>
Delphi 2.0, Borland C++Builder, Visual Basic 4, Visual Basic 5, <br>
Access 95, Access 97, ActiveX Control Pad 1.0, Visual C++ 4.2, <br>
Visual C++ 5.0, Internet Explorer 3.01, and FrontPage 2.0. <br>
There are known problems with ActiveX controls hosted in <br>
Microsoft Access 95. Please check the Borland Web site for <br>
the most up-to-date information on supported containers. <br>
<br>
<br>
Because of a known problem with Internet Explorer, arrow keys <br>
don't work inside some ActiveX controls when they are first <br>
activated in IE. If you tab out of the control and then tab <br>
back into it, the arrow keys will function normally. <br>
<br>
Several problems with Internet Explorer 3.0's ActiveX download <br>
feature were fixed in version 3.01. IE 3.01 is available on the <br>
Delphi CD (in the IE3 directory). To determine which version you <br>
currently have installed, check the IEXPLORE.EXE date stamp; <br>
"3:01am" means version 3.01. <br>
<br>
To change the name of an ActiveForm, you must perform these <br>
three steps in the following order: <br>
1. Use the Object Inspector to change the form's name. <br>
2. Use the Type Library editor to change the coclass name. <br>
3. Use the Code editor to modify Class_xx in the factory <br>
create call (in the form's initialization section). For <br>
example, if you've changed the name of the form from <br>
MyForm to YourForm, you would change the create call from <br>
<br>
TActiveFormFactory.Create(ComServer, TActiveFormControl, <br>
TYourForm, Class_MyForm, 1, '', OLEMISC_SIMPLEFRAME or <br>
OLEMISC_ACTSLIKELABEL); <br>
to <br>
<br>
TActiveFormFactory.Create(ComServer, TActiveFormControl, <br>
TYourForm, Class_YourForm, 1, '', OLEMISC_SIMPLEFRAME or <br>
OLEMISC_ACTSLIKELABEL); <br>
<br>
The Type Library editor cannot create a property of the type <br>
TSafeArray or a function that returns a TSafeArray. Use the <br>
OleVariant type instead. <br>
<br>
QuickReports <br>
------------ <br>
Due to limitations in the conversion process, some complex <br>
reports from Delphi 2 may not load properly. <br>
<br>
Dynamically Loaded Libraries <br>
---------------------------- <br>
Windows NT sometimes incorrectly unloads a library when another <br>
library that depends on it fails to load. This problem occurs <br>
only when libraries are loaded dynamically under the conditions <br>
described below. It affects Windows NT 3.51; Service Pack 2 <br>
described below. It affects Windows NT 3.51; Service Pack 2 <br>
fixes the bug for Windows NT 4.0. <br>
<br>
The problem arises when a dynamically loaded library uses two <br>
other libraries, each of which in turn uses another library. <br>
Suppose, for example, that an application uses five DLLs that <br>
are loaded dynamically in the following order: DLL1, DLL2, DLL3, <br>
DLL4, DLL5. Suppose that the following dependencies hold among <br>
the DLLs: <br>
<br>
DLL5 uses DLL4; DLL4 uses DLL3. <br>
DLL5 uses DLL2; DLL2 uses DLL1. <br>
<br>
Suppose the first three DLLs (DLL1-3) load successfully, but <br>
DLL4 calls an entry point in DLL3 that has been removed. In <br>
this case, DLL5 will naturally fail to load. If a second <br>
attempt is made to load the library, Windows will unload <br>
DLL1 and the application program may crash. <br>
<br>
This problem can affect installation of packages within the <br>
Delphi IDE; it does not affect deployed applications, where <br>
packages are statically loaded. If you are using Delphi under <br>
Windows NT 3.51, the best way to avoid the problem is to make <br>
sure all required packages are updated before you recompile <br>
or install components. <br>
<br>
---------------------------------------------------------------- <br>
<br>
Unless otherwise noted, all materials provided in this release <br>
are Copyright 1983 - 1997 by Borland International. <br>
<br>
----------------------------- END ------------------------------ <br>
<br>
-- <br>
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