Sizeof未定义是我面临的错误 [英] Sizeof is undefined is the error I am facing

问题描述

/*
 * jcapimin.c
 *
 * Copyright (C) 1994-1998, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains application interface code for the compression half
 * of the JPEG library.  These are the "minimum" API routines that may be
 * needed in either the normal full-compression case or the transcoding-only
 * case.
 *
 * Most of the routines intended to be called directly by an application
 * are in this file or in jcapistd.c.  But also see jcparam.c for
 * parameter-setup helper routines, jcomapi.c for routines shared by
 * compression and decompression, and jctrans.c for the transcoding case.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include <stdio.h>
#include "string.h"
/*
 * Initialization of a JPEG compression object.
 * The error manager must already be set up (in case memory manager fails).
 */

GLOBAL(void)
jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
{
  int i;

  /* Guard against version mismatches between library and caller. */
  cinfo->mem = 0;		/* so jpeg_destroy knows mem mgr not called */
  if (version != JPEG_LIB_VERSION)
    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
  if (structsize != SIZEOF(struct jpeg_compress_struct))
    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
	     (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);

  /* For debugging purposes, we zero the whole master structure.
   * But the application has already set the err pointer, and may have set
   * client_data, so we have to save and restore those fields.
   * Note: if application hasn't set client_data, tools like Purify may
   * complain here.
   */
  {
    struct jpeg_error_mgr * err = cinfo->err;
    void * client_data = cinfo->client_data; /* ignore Purify complaint here */
    MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
    cinfo->err = err;
    cinfo->client_data = client_data;
  }
  cinfo->is_decompressor = FALSE;

  /* Initialize a memory manager instance for this object */
void  jinit_memory_mgr(j_common_ptr cinfo);

  /* Zero out pointers to permanent structures. */
  cinfo->progress = NULL;
  cinfo->dest = NULL;

  cinfo->comp_info = NULL;

  for (i = 0; i < NUM_QUANT_TBLS; i++)
    cinfo->quant_tbl_ptrs[i] = NULL;

  for (i = 0; i < NUM_HUFF_TBLS; i++) {
    cinfo->dc_huff_tbl_ptrs[i] = NULL;
    cinfo->ac_huff_tbl_ptrs[i] = NULL;
  }

  cinfo->script_space = NULL;

  cinfo->input_gamma = 1.0;	/* in case application forgets */

  /* OK, I'm ready */
  cinfo->global_state = CSTATE_START;
}


/*
 * Destruction of a JPEG compression object
 */

GLOBAL(void)
jpeg_destroy_compress (j_compress_ptr cinfo)
{
  void jpeg_destroy(j_common_ptr cinfo); /* use common routine */
}


/*
 * Abort processing of a JPEG compression operation,
 * but don't destroy the object itself.
 */

GLOBAL(void)
jpeg_abort_compress (j_compress_ptr cinfo)
{
  void jpeg_abort(j_common_ptr cinfo); /* use common routine */
}


/*
 * Forcibly suppress or un-suppress all quantization and Huffman tables.
 * Marks all currently defined tables as already written (if suppress)
 * or not written (if !suppress).  This will control whether they get emitted
 * by a subsequent jpeg_start_compress call.
 *
 * This routine is exported for use by applications that want to produce
 * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
 * since it is called by jpeg_start_compress, we put it here --- otherwise
 * jcparam.o would be linked whether the application used it or not.
 */

GLOBAL(void)
jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
{
  int i;
  JQUANT_TBL * qtbl;
  JHUFF_TBL * htbl;

  for (i = 0; i < NUM_QUANT_TBLS; i++)
  {
    if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
      qtbl->sent_table = suppress;
  }

  for (i = 0; i < NUM_HUFF_TBLS; i++)
  {
    if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
      htbl->sent_table = suppress;
    if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
      htbl->sent_table = suppress;
  }
}


/*
 * Finish JPEG compression.
 *
 * If a multipass operating mode was selected, this may do a great deal of
 * work including most of the actual output.
 */

GLOBAL(void)
jpeg_finish_compress (j_compress_ptr cinfo)
{
  JDIMENSION iMCU_row;

  if (cinfo->global_state == CSTATE_SCANNING || cinfo->global_state == CSTATE_RAW_OK)
  {
    /* Terminate first pass */
    if (cinfo->next_scanline < cinfo->image_height)
      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
    (*cinfo->master->finish_pass) (cinfo);
  } else if (cinfo->global_state != CSTATE_WRCOEFS)
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
  /* Perform any remaining passes */
  while (! cinfo->master->is_last_pass) {
    (*cinfo->master->prepare_for_pass) (cinfo);
    for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
      if (cinfo->progress != NULL) {
	cinfo->progress->pass_counter = (long) iMCU_row;
	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
      }
      /* We bypass the main controller and invoke coef controller directly;
       * all work is being done from the coefficient buffer.
       */
      if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
	ERREXIT(cinfo, JERR_CANT_SUSPEND);
    }
    (*cinfo->master->finish_pass) (cinfo);
  }
  /* Write EOI, do final cleanup */
  (*cinfo->marker->write_file_trailer) (cinfo);
  (*cinfo->dest->term_destination) (cinfo);
  /* We can use jpeg_abort to release memory and reset global_state */
 void  jpeg_abort(j_common_ptr cinfo);
}


/*
 * Write a special marker.
 * This is only recommended for writing COM or APPn markers.
 * Must be called after jpeg_start_compress() and before
 * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
 */

GLOBAL(void)
jpeg_write_marker (j_compress_ptr cinfo, int marker,
		   const JOCTET *dataptr, unsigned int datalen)
{
  JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));

  if (cinfo->next_scanline != 0 ||
      (cinfo->global_state != CSTATE_SCANNING &&
       cinfo->global_state != CSTATE_RAW_OK &&
       cinfo->global_state != CSTATE_WRCOEFS))
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
  write_marker_byte = cinfo->marker->write_marker_byte;	/* copy for speed */
  while (datalen--) {
    (*write_marker_byte) (cinfo, *dataptr);
    dataptr++;
  }
}

/* Same, but piecemeal. */

GLOBAL(void)
jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
{
  if (cinfo->next_scanline != 0 ||
      (cinfo->global_state != CSTATE_SCANNING &&
       cinfo->global_state != CSTATE_RAW_OK &&
       cinfo->global_state != CSTATE_WRCOEFS))
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
}

GLOBAL(void)
jpeg_write_m_byte (j_compress_ptr cinfo, int val)
{
  (*cinfo->marker->write_marker_byte) (cinfo, val);
}


/*
 * Alternate compression function: just write an abbreviated table file.
 * Before calling this, all parameters and a data destination must be set up.
 *
 * To produce a pair of files containing abbreviated tables and abbreviated
 * image data, one would proceed as follows:
 *
 *		initialize JPEG object
 *		set JPEG parameters
 *		set destination to table file
 *		jpeg_write_tables(cinfo);
 *		set destination to image file
 *		jpeg_start_compress(cinfo, FALSE);
 *		write data...
 *		jpeg_finish_compress(cinfo);
 *
 * jpeg_write_tables has the side effect of marking all tables written
 * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
 * will not re-emit the tables unless it is passed write_all_tables=TRUE.
 */

GLOBAL(void)
jpeg_write_tables (j_compress_ptr cinfo)
{
  if (cinfo->global_state != CSTATE_START)
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

  /* (Re)initialize error mgr and destination modules */
  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
  (*cinfo->dest->init_destination) (cinfo);
  /* Initialize the marker writer ... bit of a crock to do it here. */
  jinit_marker_writer(cinfo);
  /* Write them tables! */
  (*cinfo->marker->write_tables_only) (cinfo);
  /* And clean up. */
  (*cinfo->dest->term_destination) (cinfo);
  /*
   * In library releases up through v6a, we called jpeg_abort() here to free
   * any working memory allocated by the destination manager and marker
   * writer.  Some applications had a problem with that: they allocated space
   * of their own from the library memory manager, and didn't want it to go
   * away during write_tables.  So now we do nothing.  This will cause a
   * memory leak if an app calls write_tables repeatedly without doing a full
   * compression cycle or otherwise resetting the JPEG object.  However, that
   * seems less bad than unexpectedly freeing memory in the normal case.
   * An app that prefers the old behavior can call jpeg_abort for itself after
   * each call to jpeg_write_tables().
   */
}

我尝试了什么：



i尝试添加#defined< string.h>但是我无法构建

What I have tried:

i have tried by adding #defined<string.h> but i am not able to build

推荐答案

C / C ++是一种区分大小写的语言。 sizeof 运算符全部为小写。



您问题中的代码使用 SIZEOF 这似乎是一个宏定义，可能在其中一个包含的头文件中定义。如果你看一下 jinclude.h [ ^ ]文件您将找到定义（并注释为何使用它）：

C/C++ is a case sensitive language. The sizeof operator is all lower case.

The code from your question uses SIZEOF which seems to be a macro definition which is probably defined in one of the included header files. If you have a look at the jinclude.h[^] file you will find the definition (and a comment why it is used):

#define SIZEOF(object) ((size_t) sizeof(object))

所以它应该有效。请查看错误消息：它会通知您发生错误的文件名和行号。如果它是你的一个源文件，你应该使用 sizeof 。



如需进一步的帮助（如果你不是能够自己解决问题），你应该添加完整的错误信息和错误发生在您的问题的代码行。了解您正在使用的编译器可能也很有帮助。

So it should work. Have a look at the error message: It informs you about the file name and line number where the error occured. If it is one of your source files you should use sizeof.

For further help (if you are not able to solve the problem yourself), you should add the full error message and the code line where the error occured to your question. It may be also helpful to know which compiler you are using.

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