print_pic.c

QNX实时操作系统用于控制打印机的示例代码。

#include <stdio.h>
#include <stdlib.h>
#include <Pt.h>

PtWidget_t *pane, *window;
PpPrintContext_t *pc;

int quit_cb ( PtWidget_t *widget, void *data, 
              PtCallbackInfo_t *cbinfo)
{
    PpReleasePC (pc);
    fflush( stdout );
    exit (EXIT_SUCCESS);
    return (Pt_CONTINUE);
}

int print_cb ( PtWidget_t *widget, void *data, 
               PtCallbackInfo_t *cbinfo)
{
    int action;

    /* You could make these calls to PpSetPC() right
       after creating the print context. Having it here
       lets you reuse the print context. */
    PhDim_t size = { 850, 1100 };
    PhDim_t size2 = { 200, 150 };

    /* Set the source resolution to be proportional to 
       the size of a page. */
       fflush( stdout );
    PpSetPC(pc, Pp_PC_SOURCE_SIZE, &size, 0);
	fflush( stdout );
    /* Uncomment this to set the source size to be the size
       of the widget. The widget will be scaled when printed. */
    /* PpSetPC(pc, Pp_PC_SOURCE_SIZE, &size2, 0); */

    action = PtPrintSelection(window, NULL, 
                 "Demo Print Selector", pc, 
                 Pt_PRINTSEL_DFLT_LOOK);
    if (action != Pt_PRINTSEL_CANCEL)
    {
        /* Start printing the pane. Note that we're using
           the same print context for all print jobs. */
        PpStartJob(pc);
        fflush( stdout );
        PpContinueJob(pc);
        fflush( stdout );

        /* Print the widget. */
        PpPrintWidget(pc, pane, NULL, NULL, 0);
        fflush( stdout );

        /* Close the print context. */
      PpSuspendJob(pc);
        PpEndJob(pc);
    }

    return (Pt_CONTINUE);
}

int main(int argc, char *argv[])
{
    PtArg_t args[4];
    PtWidget_t *print, *quit;
    PhDim_t  win_dim = { 200, 200 };
    PhArea_t pane_area = { {0, 0}, {200, 150} };
    PhArea_t print_area = { {30, 170}, {60, 20} };
    PhArea_t quit_area = { {110, 170}, {60, 20} };
    PhArea_t cir_area = { {35, 20}, {130, 110} };
    PhArea_t cir2_area = { {67, 40}, {20, 20} };
    PhArea_t cir3_area = { {110, 40}, {20, 20} };
    PhArea_t cir4_area = { {85, 80}, {30, 30} };
    PtCallback_t callbacks[2] = { {print_cb, NULL}, 
                                  {quit_cb, NULL} };

    if (PtInit(NULL) == -1)
        PtExit(EXIT_FAILURE);

    /* Create the main window. */
    PtSetArg (&args[0], Pt_ARG_DIM, &win_dim, 0);
    PtSetArg (&args[1], Pt_ARG_WINDOW_TITLE, 
              "Print Example", 0);
    if ((window = PtCreateWidget(PtWindow, Pt_NO_PARENT,
                                 2, args)) == NULL)
        PtExit(EXIT_FAILURE);

    /* Create a print context. */
    pc = PpCreatePC();
    fflush( stdout );

    /* Create the pane to be printed. */
    PtSetArg (&args[0], Pt_ARG_AREA, &pane_area, 0);
    pane = PtCreateWidget (PtPane, window, 1, args);

    /* put some stuff in the pane to be printed. */
    PtSetArg (&args[0], Pt_ARG_AREA, &cir_area, 0);
    PtCreateWidget (PtEllipse, pane, 1, args);

    PtSetArg (&args[0], Pt_ARG_AREA, &cir2_area, 0);
    PtSetArg (&args[1], Pt_ARG_FILL_COLOR, Pg_BLACK, 0);
    PtCreateWidget (PtEllipse, pane, 2, args);

    PtSetArg (&args[0], Pt_ARG_AREA, &cir3_area, 0);
    PtSetArg (&args[1], Pt_ARG_FILL_COLOR, Pg_BLACK, 0);
    PtCreateWidget (PtEllipse, pane, 2, args);

    PtSetArg (&args[0], Pt_ARG_AREA, &cir4_area, 0);
    PtCreateWidget (PtEllipse, pane, 1, args);

    /* Create the print button. */
    PtSetArg(&args[0], Pt_ARG_AREA, &print_area, 0);
    PtSetArg(&args[1], Pt_ARG_TEXT_STRING, "Print", 0);
    PtSetArg(&args[2], Pt_CB_ACTIVATE, &callbacks[0], 0);
    print = PtCreateWidget (PtButton, window, 3, args);

    /* Create the quit button. */
    PtSetArg(&args[0], Pt_ARG_AREA, &quit_area, 0);
    fflush( stdout );
    PtSetArg(&args[1], Pt_ARG_TEXT_STRING, "Quit", 0);
    PtSetArg(&args[2], Pt_CB_ACTIVATE, &callbacks[1], 0);
    quit = PtCreateWidget (PtButton, window, 3, args);

    PtRealizeWidget(window);
    PtMainLoop();
    return (EXIT_SUCCESS);
}