90 lines
5.9 KiB
HTML
90 lines
5.9 KiB
HTML
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Buffer Manipulation and Query APIs</title>
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<h2>Buffer Manipulation and Query APIs</h2>
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<p>The buffer manipulation and query APIs are used to create, query, and
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manipulate input and command buffers that interact with the screen.</p>
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<p>The two buffer types used by the low-level interfaces are command and input.
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A command buffer can be used to accumulate a sequence of low-level commands
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without performing an I/O operation. The entire buffer can be written out at
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once in a single I/O operation. See <a href="dsm1e.htm#HDRDIRECT">Direct and
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Indirect Operations</a> for further discussion of command buffers. When an
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input operation is performed, you can specify an input buffer as the target of
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the operation. The input results are placed in this buffer, which can then be
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queried through several interfaces. You may query for individual pieces of
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information, such as the AID byte from the input operation using the Retrieve
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AID Code on Read (QsnRtvReadAID) API or for multiple pieces of information
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using the Retrieve Read Information (QsnRtvReadInf) API.</p>
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<p>Command and input buffers can be used across activation groups if the
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activation group in which the buffer was created still exists.</p>
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<p>The buffer manipulation and query interfaces are:</p>
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<ul>
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<li><A HREF="QsnClrBuf.htm">Clear Buffer</A> (QsnClrBuf) clears all commands or data in a buffer resets its state.</li>
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<li><A HREF="QsnCpyBuf.htm">Copy Buffer</A> (QsnCpyBuf) copies the contents of one buffer to another.</li>
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<li><A HREF="QsnCrtCmdBuf.htm">Create Command Buffer</A> (QsnCrtCmdBuf) creates a command buffer to accumulate low-level commands.</li>
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<li><A HREF="QsnCrtInpBuf.htm">Create Input Buffer</A> (QsnCrtInpBuf) creates an input buffer to receive input results.</li>
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<li><A HREF="QsnDltBuf.htm">Delete Buffer</A> (QsnDltBuf) deletes a buffer.</li>
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<li><A HREF="QsnPutBuf.htm">Put Command Buffer</A> (QsnPutBuf) sends the commands in a command buffer to the screen.</li>
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<li><A HREF="QsnPutGetBuf.htm">Put Command Buffer and Perform Get</A> (QsnPutGetBuf) sends the commands in a command buffer to the screen and performs a read operation.</li>
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<li><A HREF="QsnRtvReadAID.htm">Retrieve AID Code on Read</A> (QsnRtvReadAID) determines the Aid code for a given input operation.</li>
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<li><A HREF="QsnRtvAvailData.htm">Retrieve Available Data</A> (QsnRtvAvailData) copies the user's data into an input buffer.</li>
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<li><A HREF="QsnRtvBufLen.htm">Retrieve Buffer Data Length</A> (QsnRtvBufLen) returns the length of data in a buffer.</li>
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<li><A HREF="QsnRtvBufSiz.htm">Retrieve Buffer Size</A> (QsnRtvBufSiz) returns the size of a buffer.</li>
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<li><A HREF="QsnRtvReadAdr.htm">Retrieve Cursor Address on Read</A> (QsnRtvReadAdr) retrieves the cursor position at the completion of an input operation.</li>
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<li><A HREF="QsnRtvFldInf.htm">Retrieve Field Information</A> (QsnRtvFldInf) returns information about a particular field in an input buffer.</li>
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<li><A HREF="QsnRtvDtaLen.htm">Retrieve Length of Data in Input Buffer</A> (QsnRtvDtaLen) retrieves the number of data bytes in an input buffer after an input operation.</li>
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<li><A HREF="QsnRtvFldDtaLen.htm">Retrieve Length of Field Data in Buffer</A> (QsnRtvFldDtaLen) retrieves the number of bytes of field data after an input operation.</li>
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<li><A HREF="QsnRtvReadLen.htm">Retrieve Number of Bytes Read from Screen</A> (QsnRtvReadLen) retrieves the number of data bytes read from the screen after an input operation.</li>
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<li><A HREF="QsnRtvFldCnt.htm">Retrieve Number of Fields Read</A> (QsnRtvFldCnt) retrieves the number of fields in an input buffer.</li>
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<li><A HREF="QsnRtvDta.htm">Retrieve Pointer to Data in Input Buffer</A> (QsnRtvDta) returns a pointer to the first byte of input data in an input buffer.</li>
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<li><A HREF="QsnRtvFldDta.htm">Retrieve Pointer to Field Data</A> (QsnRtvFldDta) returns a pointer to the first byte of field data in an input buffer.</li>
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<li><A HREF="QsnRtvReadInf.htm">Retrieve Read Information</A> (QsnRtvReadInf) returns information about the input operation.</li>
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</ul>
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<td valign="middle" align="center">
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<a href="#Top_Of_Page">Top</a> |
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<a href="dsm.htm">Dynamic Screen Manager APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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