| Pro*C/C++ Getting Started Release 9.2 for Windows Part Number A96111-03 |
|
|
View PDF |
| Pro*C/C++ Getting Started Release 9.2 for Windows Part Number A96111-03 |
|
|
View PDF |
This chapter explains how to create and precompile a project. It also describes the Pro*C/C++ graphical user interface, from which you execute commands with Windows menus and icons or with keyboard equivalents, and using Pro*C/C++ at the command prompt.
This chapter contains these topics:
Before you follow the instructions for creating and precompiling a Pro*C/C++ project, you should familiarize yourself with the basic commands, dialog boxes, menus, and buttons of the Pro*C/C++ graphical user interface.
To start the graphical user interface, choose Start Programs > Oracle - HOME_NAME Application Development > Pro C-C++. Figure 2-1 shows the four elements of the Pro*C/C++ precompile environment.
The title bar displays the name of the Pro*C/C++ project. If you have not assigned a name to the current project, the word "Untitled" appears instead.
The menu bar contains the following menus. Table 2-1 lists and describes the menus.
The Toolbar enables you to execute commands by choosing a button. Figure 2-2 shows the Toolbar buttons.
Table 2-2 describes the Toolbar buttons in order, from left to right.
Table 2-2 Toolbar Buttons
| Button | Description |
|---|---|
| New | Create a new Pro*C/C++ project |
| Open | Open an existing Pro*C/C++ project |
| Save | Save the active Pro*C/C++ project under the same name |
| Add | Add files to a Pro*C/C++ project |
| Delete | Delete files from a Pro*C/C++ project |
| Options | Display or change precompiler options |
| Precompile | Precompile a Pro*C/C++ project |
Figure 2-3 shows the four elements of the information pane.
Table 2-3 lists and describes the Information Pane elements.
Table 2-3 Information Pane Elements
| Element | Description |
|---|---|
| Precompilation Status Bar | Indicates whether the precompilation for a file was successful or unsuccessful. |
| Input File | Shows the files of a Pro*C/C++ project to be precompiled. |
| Output File | Shows the output files of a Pro*C/C++ project after precompilation. |
| Options | Displays precompile options that are different from the default options. |
Look for one of the three status icons in the precompilation status bar after the precompile process is complete.
A green check indicates that the file precompiled successfully.
A yellow check indicates that the file precompiled successfully, but there are one or more warnings.
A red X indicates that the file did not precompile successfully.
Double-clicking a status icon opens the Precompilation Status dialog box. This dialog box provides detailed information on the reason for a warning or failure.
This section describes the steps involved in creating and precompiling a Pro*C/C++ project. After starting the Pro*C/C++ application, perform the following steps:
Pro*C/C++ opens only one project at a time. A project consists of one or more precompilable files. Project files have an extension of .pre.
Use the Preferences menu to determine the default extension of the output files. Figure 2-4 shows the Preferences menu.
This setting only affects input files that you add later. An existing output filename will not change. However, you can change an existing output filename by double-clicking the output file and entering a new name.
If you select Default Output C File Name, the default extension of the output files is .c.
If you select Default Output C++ File Name, the default extension of the output files is .cpp.
If you deselect both Default Output C File Name and Default Output C++ File Name, the Output File dialog box appears when you add an output file.
Enter an output filename for the file selected. After you select or enter a filename, it appears in the Output File area of the information pane.
To change the name of an existing input or output file:
Double-click the filename in the Input File or Output File area of the information pane. The Input File or Output File dialog box appears.
Replace the old filename with the new filename.
Choose Open.
Select one or more .pc files. Use the Ctrl key and the mouse to select files that are not adjacent.
Choose Open. The selected files appear in the information pane.
If you need to, you can easily delete one or more files from the project.
To delete files from the project:
Highlight the file(s) in the information pane.
Choose Edit > Delete.
Choose Yes.
The Precompiler options enable you to control how resources are used, how errors are reported, how input and output are formatted, and how cursors are managed.
To set the precompile options:
Select one or more files in the Input File list.
Choose Edit > Options. The Options dialog box appears.
Default options are in effect for all newly added files. When you change an option's default setting, a description of the change appears in the Option String edit field at the bottom of the Options dialog box and in the Options area of the information pane. For additional information on options, see "Precompiler Options".
To change the format of the output list file that the precompiler writes to disk, choose the Listing/Errors button. The Listing/Errors dialog box appears.
The settings include the type of error information generated and the name of the list file.
After you set the options in the Options dialog box, choose OK.
If you selected semantics or full for the SQL Check option in the Options dialog box, you may need to specify database connection information to the Oracle database. You do not need to connect to the Oracle database if every table referenced in a data manipulation statement or PL/SQL block is defined in a DECLARE TABLE statement.
To specify database connection information:
Choose File > Connect. The Connect dialog box appears.
Use this dialog box to specify database connection information prior to precompiling. No database connection is performed at this time. Only one set of database connection information can be specified for all files requiring semantic or full checking with SQLCHECK.
The Connect dialog box appears automatically at precompile time if you have not previously responded. Enter the username, the password, and the network service name (database alias). The network service name is not required for a local database.
If you want to save the connection information between Pro*C/C++ sessions, select the Save Connect String to Disk check box. If you do not select the check box, you must enter this information each time you precompile.
Choose OK.
You can precompile any number of files in the Input File list.
To precompile:
Select one or more files in the Input File list. You can use the Control key to highlight files that are not adjacent to each other (for example, the first and third files in a list).
Choose File > Precompile.
When precompiling is completed, the message in the dialog box indicates "Precompiling Finished!", and the Cancel button changes to OK.
Choose OK.
|
Note: Although choosing Cancel does not interrupt the precompile for a file already in process, it does halt the precompile chain for remaining files. |
Precompiling can result in success, success with warning(s), or failure. When precompiling is finished, check the precompilation status bar.
A green check indicates that the file compiled successfully.
A yellow check indicates that the file compiled successfully, but there are one or more warnings.
A red X indicates that the file did not compile successfully.
If you see a yellow check or a red X, double-click the icon in status bar. The Precompilation Status dialog box appears. This dialog box lists warning messages or reasons why the precompilation failed. For example:
Switch to your development environment to fix the problem(s). After you correct the errors, precompile again.
To precompile a file at the command prompt, enter the following command:
C:\> proc iname=filename.pc
where filename.pc is the name of the file. If the file is not in your current working directory, include the file's full path after the INAME argument.
Pro*C/C++ generates filename.c, which can be compiled by your C compiler.
The ORACLE_BASE\ORACLE_HOME\precomp\public directory contains the Pro*C/C++ header files. Table 2-4 lists and describes the header files.
Table 2-4 Header Files
The ORACLE_BASE\ORACLE_HOME\precomp\lib\msvc directory contains the library file that you use when linking Pro*C/C++ applications. The library file is called orasql9.lib.
Pro*C/C++ application program interface (API) calls are implemented in DLL files provided with your Pro*C/C++ software. To use the DLLs, you must link your application with the import libraries (.lib files) that correspond to the Pro*C/C++ DLLs. Also, you must ensure that the DLL files are installed on the computer that is running your Pro*C/C++ application.
Microsoft provides you with three libraries: libc.lib, libcmt.lib, and msvcrt.lib. The Oracle DLLs use the msvcrt.lib runtime library. You must link with msvcrt.lib rather than the other two Microsoft libraries.
Build multithreaded applications if you are planning to perform concurrent database operations.
Windows NT, Windows 2000, and Windows 98 schedule and allocate threads belonging to processes. A thread is a path of a program's execution. It consists of a kernel stack, the state of the CPU registers, a thread environment block, and a users stack. Each thread shares the resources of a process. Multithreaded applications use the resources of a process to coordinate the activities of individual threads.
When building a multithreaded application, make sure that your C/C++ code is reentrant. This means that access to static or global data must be restricted to one thread at a time. If you mix multithreaded and non-reentrant functions, one thread can modify information that is required by another thread.
The Pro*C/C++ precompiler automatically creates variables on the local stack of the thread. This ensures that each thread using the Pro*C/C++ function has access to a unique set of variables and is reentrant.
|
See Also: Pro*C/C++ Programmer's Guide for additional information on how to write multithreaded applications with Pro*C/C++ |
This section highlights issues related to Pro*C/C++ for Windows platforms.
A configuration file is a text file that contains precompiler options.
For this release, the system configuration file is called pcscfg.cfg. This file is located in the ORACLE_BASE\ORACLE_HOME\precomp\admin directory.
The CODE option has a default setting of ANSI_C. Pro*C/C++ for other operating systems may have a default setting of KR_C.
For the Pro*C/C++ graphical user interface, use the Include Directories field of the Options dialog box to enter INCLUDE path directories. If you want to enter more than one path, separate each path with a semicolon, but do not insert a space after the semicolon. This causes a separate "INCLUDE=" string to appear in front of each directory.
For sample programs that precompile with PARSE=PARTIAL or PARSE=FULL, an include path of c:\program files\devstudio\vc\include has been added. If Microsoft Visual C++ has been installed in a different location, modify the Include Directories field accordingly for the sample programs to precompile correctly.
The XA Application Program Interface (API) is typically used to enable an Oracle database to interact with a transaction processing (TP) monitor, such as:
BEA Tuxedo
IBM Transarc Encina
IBM CICS
You can also use TP monitor statements in your client programs. The use of the XA API is also supported from both Pro*C/C++ and OCI.
The Oracle XA Library is automatically installed as part of Oracle9i Enterprise Edition. The following components are created in your Oracle home directory:
Table 2-5 Oracle XA Library Components and Locations
| Component | Location |
|---|---|
oraxa9.lib |
ORACLE_BASE\ORACLE_HOME\rdbms\xa |
xa.h |
ORACLE_BASE\ORACLE_HOME\rdbms\demo |
To compile and link a Pro*C/C++ program with XA:
Precompile filename.pc using Pro*C/C++ to generate filename.c.
Compile filename.c, making sure to include ORACLE_BASE\ORACLE_HOME\rdbms\xa in your path.
Link filename.obj with the following libraries:
| Library | Location |
|---|---|
oraxa9.lib |
ORACLE_BASE\ORACLE_HOME\rdbms\xa |
oci.lib |
ORACLE_BASE\ORACLE_HOME\oci\lib\msvc |
orasql9.lib |
ORACLE_BASE\ORACLE_HOME\precomp\lib\msvc |
Run filename.exe.
Oracle supports the use of XA dynamic registration. XA dynamic registration improves the performance of applications that interface with XA-compliant TP monitors.
For TP monitors to use XA dynamic registration with an Oracle database on Windows NT, you must add either an environmental variable or a registry variable to the Windows NT computer on which your TP monitor is running. See either of the following sections for instructions:
Adding an environmental variable at the command prompt affects only the current session.
To add an environmental variable for the current session:
Go to the computer where your TP monitor is installed.
Enter the following at the command prompt:
C:\> set ORA_XA_REG_DLL = vendor.dll
where vendor.dll is the TP monitor DLL provided by your vendor.
Adding a registry variable affects all sessions on your Windows NT computer. This is useful for computers where only one TP monitor is running.
To add a registry variable for all sessions:
Go to the computer where your TP monitor is installed.
Enter the following at the command prompt:
C:\> regedt32
The Registry Editor window appears.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOMEID.
Choose the Add Value option in the Edit menu.
The Add Value dialog box appears.
Enter ORA_XA_REG_DLL in the Value Name field.
Select REG_EXPAND_SZ from the Data Type drop-down list box.
Choose OK.
The String Editor dialog box appears.
Enter vendor.dll in the String field, where vendor.dll is the TP monitor DLL provided by your vendor.
Choose OK.
The Registry Editor adds the parameter.
Choose Exit from the Registry menu.
The registry exits.
Refer to the following for more information about XA and TP monitors:
Distributed TP: The XA Specification (C193) published by the Open Group. See the Web site at:
http://www.opengroup.org/publications/catalog/tp.htm
The Open Group., 1010 El Camino Real, Suite 380, Menlo Park, CA 94025, U.S.A.
Your specific TP monitor documentation
|
See Also: Oracle Database Application Developer's Guide - Fundamentals for more information about the Oracle XA Library and using XA dynamic registration |
|
 Copyright © 1996, 2003, Oracle Corporation All Rights Reserved. |
|
