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IBM Comprehensive Guide to QtmhRdStin and QtmhWrStOut API Usage

Models: AS/400E

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The structure in which to return error information. For the format of the structure and for details on how to process API errors, see the programming topic in the AS/400 Information Center.

Error messages

CPF24B4 E

Severe Error while addressing parameter list.

CPF3021 E

The value specified for the argument is not correct.

CPF3C17 E

Error occurred with input data parameter.

CPF3CF1 E

Error code parameter not valid.

CPF3408 E

The address used for an argument is not correct.

CPF3460 E

Storage allocation request failed.

CPF3474 E

Unknown system state.

CPF3484 E

A damaged object was encountered.

Note: The Environment Variable APIs provide the putenv() (Put Value in Environment Variable) function necessary to set (or create and set) an environment variable. Therefore, programs written in ILE/C do not need to use the QtmhPutEnv() API. This API, for ILE/C, is more difficult to use (and is slower) than the putenv() API on which it is based.

Read from Stdin (QtmhRdStin) API

Parameters

Required Parameter Group:

1

Receiver variable

Output

Char(*)

2

Length of receiver variable

Input

Binary(4)

3

Length of response available

Output

Binary(4)

4

Error Code

I/O

Char(*)

The QtmhRdStin API allows CGI programs that are written in languages other than C to read from stdin. CGI programs read from stdin when the request from the browser indicates the method that is POST. This API reads what the server has generated as input for the CGI program.

Important!

CGI input data is only available from standard input when the client request is submitted with method POST. There are no standard input data when the method is GET or HEAD. In addition, the Content_Length environment variable is set only when the Request_Method is POST.

Chapter 2. Application Programming Interfaces 27

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IBM AS/400E manual Read from Stdin QtmhRdStin API
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AS/400E specifications

The IBM AS/400E, now more commonly known as IBM i, is a robust and versatile midrange server that has been designed to provide a comprehensive computing solution for businesses of all sizes. First introduced in the late 1980s, the AS/400 series has undergone multiple enhancements and rebranding, with the AS/400E being one of the notable iterations. This powerful platform is closely associated with IBM's commitment to reliability, scalability, and integrated business solutions.

One of the main features of the AS/400E is its highly integrated architecture that combines hardware and software into a cohesive system. This integration allows for seamless operations, reducing the complexity typically associated with managing disparate systems. The system is powered by IBM's proprietary OS/400 operating system, which has evolved into IBM i, featuring advanced capabilities like object-oriented programming, integrated database management, and security features that are essential for enterprise environments.

A key characteristic of the AS/400E is its robust database support, primarily through the use of DB2 for i. This integrated database management system enables efficient data handling and retrieval, facilitating real-time business analytics and reporting. Furthermore, the platform supports a variety of programming languages, including RPG, COBOL, and Java, making it flexible for developers who require diverse tools for application development.

The AS/400E is also known for its exceptional reliability and uptime, making it a preferred choice for critical business applications in industries such as finance, healthcare, and manufacturing. This reliability is backed by advanced error detection and correction mechanisms, as well as redundancy features that help prevent data loss and minimize downtime.

In terms of scalability, the AS/400E can effortlessly expand to accommodate growing business demands. Organizations can increase processing power by adding more resources without significant disruption. This scalability, combined with the system’s built-in virtualization capabilities, allows businesses to optimize resource usage and streamline operations.

Security is another defining feature of the AS/400E. The platform incorporates various layers of security measures, including user authentication, encryption, and comprehensive auditing capabilities, ensuring that sensitive business data is protected against unauthorized access.

Overall, the IBM AS/400E remains a powerful tool in the enterprise computing landscape, providing businesses with an integrated, reliable, and secure solution for their technological needs. Its enduring popularity is a testament to its capability to evolve with changing business requirements while maintaining its core attributes of high performance and stability.