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    <p>The following code (SwapIOB) is used in Testbenches that want to store the stdout stream for comparison to an expected results file.</p> <p>Background: File streams are managed using an _IOB structure that is stored in an array of 20 _IOB entries. This includes stdout stream. The IOBs are stored in an array. When a file is created the application code gets a ptr to an element in that array. The application code then passes that ptr to the OS for processing I/O calls. Thus, the OS does NOT itself contain or rely on its own pointers to the application's IOB. </p> <p>Requirement: When running a testbench the stdout messages issued by an application should be re-directed to a file. However, after the module under test has completed then stdout messages should be re-redirected to the console. </p> <p>This routine was tested and is currently used on Windows XP/Pro system.</p> <pre><code>void SwapIOB(FILE *A, FILE *B) { FILE temp; // make a copy of IOB A (usually this is "stdout") memcpy(&amp;temp, A, sizeof(struct _iobuf)); // copy IOB B to A's location, now any output // sent to A is redirected thru B's IOB. memcpy(A, B, sizeof(struct _iobuf)); // copy A into B, the swap is complete memcpy(B, &amp;temp, sizeof(struct _iobuf)); } // end SwapIOB; </code></pre> <p>Application code uses SwapIOB() similar to:</p> <pre><code>FILE *fp; fp = fopen("X", "w"); SwapIOB(stdout, fp); printf("text to file X"); SwapIOB(stdout, fp); fclose(fp); printf("text to console works, again!"); </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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