MATLAB COMPILER RELEASE NOTES Guía de usuario descargar pdf (Pagina 162)

5 Controlling Code Generation

5-46

The print handler that you write must:

•Take a single argument of type

const char * that points to the t ext to be

displayed.

•Return

void.

The print handler routine

WinPrint in the example program illustrates one

possible approach to writing a print handler for a Windows program.

When the example

WinMain routine prints the array returned by mlfMrank,

mlfPrintMatrix(R);

the registered print handler, WinPrint, is called. If array R contains a 12-row

result from the call to

mlfMrank, the application calls WinPrint 12 times, each

time passing the next line of data. The print handler

WinPrint dynamically

allocates a buffer to hold the printable contents of array

R and appends e ach

text string passed to it to the buffer.

In this design, the print handler prints to a buffer rather than the screen. A

companion function

WinFlush actually displays the 12 lines of data in a

Windows message box.

In the example,

WinMain calls WinFlush immediately following the call to

mlfPrintMatrix.

mlfPrintMatrix(R);

WinFlush();

Though WinFlush is not part of t he print handler, this implementation of a

print handler requires that you call

WinFlush after any mlf function that

causes a series of calls to the print handler. For this short program, this design

is appropriate.

Here is the source code from

mrankwin.c for WinPrint and WinFlush.It

includes:

•The static, global variables used by the two routines

static int totalcnt = 0;

static int upperlim = 0;

static int firsttime = 1;

char *OutputBuffer;

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