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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">         Delphi编程                            (BM: strayli FlyingBoy)          </font></big></big></td></tr>
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<hr><p align="left"><small>发信人: Zeemon (塞下秋), 信区: Visual <br>

标  题: Delphi3(6) <br>

发信站: BBS 水木清华站 (Tue Nov 11 20:00:54 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>

Win32 shell extensions <br>

-------------------- <br>

Win32 shell extensions require that the threading model for the <br>

extension object be set to "Apartment" in the system registry. <br>

Since TComObjectFactory.UpdateRegistry doesn't make this entry <br>

automatically, you can do it manually by inserting the Value Name <br>

"ThreadingModel" with the Value "Apartment" under the CLSID key <br>

for your control in the registry. You can also override <br>

TComObjectFactory.UpdateRegistry to do this work for you; the <br>

following example code is for a Copy Hook shell extension: <br>

  <br>

 procedure TCopyHookFactory.UpdateRegistry(Register: Boolean); <br>

 var <br>

   ClsID: string; <br>

 begin <br>

   ClsID := GUIDToString(ClassID); <br>

   inherited UpdateRegistry(Register); <br>



   if Register then <br>

   begin <br>

     CreateRegKey('CLSID\' + ClsID, 'ThreadingModel', 'Apartment'); <br>

     CreateRegKey('directory\shellex\CopyHookHandlers\' + ClassName, <br>

        '', ClsID); <br>

   end <br>

   else <br>

     DeleteRegKey('directory\shellex\CopyHookHandlers\' + ClassName); <br>

 end; <br>

  <br>

Using OpenGL <br>

------------ <br>

Applications or libraries that use the OpenGL graphics libraries <br>

must ensure that the 8087 control word is set to mask Overflow, <br>

Zero Divide, and Invalid Operation exceptions. This is done <br>

automatically in the OPENGL unit, but if your application does <br>

not use the OPENGL unit (for example, if you are using an ActiveX <br>

control that employs OpenGL), you can do this by including the <br>

following line in the initialization code of a unit: <br>

  <br>

  Set8087CW($133F); <br>

  <br>

  <br>

InterBase ODBC Driver <br>

--------------------- <br>

All versions of InterBase now include an ODBC 2.50 driver <br>

which is installed with the software. <br>

  <br>

Borland Database Engine <br>

----------------------- <br>

A Driver Development Kit is available for the BDE. <br>

Contact Developer Relations at Borland for details. <br>

  <br>

SNoTableName and other constants have been moved to the <br>

BDEConst unit. <br>

  <br>

If you use the Oracle 7.2 or Oracle 7.3 client drivers, open <br>

the BDE Administrator, select the Configuration page, and <br>

navigate to Configuration/Drivers/Native/ORACLE. Then set <br>

VENDOR INIT to ORA72.DLL or ORA73.DLL. Stored procedures <br>

that return a result set are supported only for Oracle 7.3. <br>

  <br>

  <br>

Using JPEG Images <br>

----------------- <br>



To use JPEG images at design time, choose Component | Install <br>

Component, create a new package, select JPEG as the Unit File <br>

Name, and install the package. To use JPEGs in an application <br>

at runtime, include the JPEG unit in your unit's "uses" clause. <br>

  <br>

VCL Help Files <br>

-------------- <br>

The VCL Help file (VCL3.HLP) uses another file called <br>

VCL3JUMP.HLP to provide context-sensitive jump support. <br>

Do not delete this file. If you accidentally delete it, <br>

you'll have to restore it from the Delphi CD. <br>

  <br>

Overriding Resource-Module Localization <br>

--------------------------------------- <br>

At start-up, applications typically check the locale of <br>

the system and look for a resource module that matches <br>

the language and country. If you want your application <br>

to use a different resource module from the one indicated, <br>

you can set an override in the registry: Under the <br>

HKEY_Current_User\Software\Borland\Delphi\Locales key, add <br>

your application's path and filename as a string value and <br>

set the data value to the extension of your resource modules; <br>

resource modules; <br>

at startup, your application will look for resource modules <br>

with this extension before using the system locale. For more <br>

information, see "Using Resource Modules" under the <br>

"Localizing Resources" Help topic. <br>

  <br>

  <br>

  <br>

-- <br>

※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 162.105.118.41] <br>

</small><hr>
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