我在Visual Studio 2012 Pro中有一个C++DLL类型的项目，但我无法将其编译为CLR - 为什么会这样？

我有一个c++项目，它是DLL类型，我在里面创建了一个C文件。现在我需要使用CLR，因为我想在以后的。net c#中使用DLL。

现在在一般项目属性中我有:

Target Extension: .dll
Configuration Type: Dynamic Library (.dll)

公共语言运行时支持:(之前没有公共语言运行时支持)，编译时没有任何错误，但我无法将硬盘上的DLL添加到我的c#项目。

现在我把它改成:Common Language Runtime Support (/clr)

但是现在当我尝试编译项目时，我得到这个错误:

错误1错误D8045:无法编译C文件'ENCODER.C'与/clr选择

文件encode.c包含c语言内容。如果我在没有CLR的情况下编译它，没有错误，但我不能在以后的。net c#项目中添加DLL。

我也试着改变在C/c++>高级>编译为:编译为C代码(/TC)但是它并没有修复错误。

我还能做什么?

/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
/**
 * @file
 * common internal and external API header
 */
#ifndef AVUTIL_COMMON_H
#define AVUTIL_COMMON_H
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "attributes.h"
#include "version.h"
#include "libavutil/avconfig.h"
#if AV_HAVE_BIGENDIAN
#   define AV_NE(be, le) (be)
#else
#   define AV_NE(be, le) (le)
#endif
//rounded division & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
/* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFSIGN(a) ((a) > 0 ? 1 : -1)
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
/* misc math functions */
/**
 * Reverse the order of the bits of an 8-bits unsigned integer.
 */
#if FF_API_AV_REVERSE
extern attribute_deprecated const uint8_t av_reverse[256];
#endif
#ifdef HAVE_AV_CONFIG_H
#   include "config.h"
#   include "intmath.h"
#endif
/* Pull in unguarded fallback defines at the end of this file. */
#include "common.h"
#ifndef av_log2
av_const int av_log2(unsigned v);
#endif
#ifndef av_log2_16bit
av_const int av_log2_16bit(unsigned v);
#endif
/**
 * Clip a signed integer value into the amin-amax range.
 * @param a value to clip
 * @param amin minimum value of the clip range
 * @param amax maximum value of the clip range
 * @return clipped value
 */
static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
{
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
    if (amin > amax) abort();
#endif
    if      (a < amin) return amin;
    else if (a > amax) return amax;
    else               return a;
}
/**
 * Clip a signed 64bit integer value into the amin-amax range.
 * @param a value to clip
 * @param amin minimum value of the clip range
 * @param amax maximum value of the clip range
 * @return clipped value
 */
static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
{
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
    if (amin > amax) abort();
#endif
    if      (a < amin) return amin;
    else if (a > amax) return amax;
    else               return a;
}
/**
 * Clip a signed integer value into the 0-255 range.
 * @param a value to clip
 * @return clipped value
 */
static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
{
    if (a&(~0xFF)) return (-a)>>31;
    else           return a;
}
/**
 * Clip a signed integer value into the -128,127 range.
 * @param a value to clip
 * @return clipped value
 */
static av_always_inline av_const int8_t av_clip_int8_c(int a)
{
    if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
    else                  return a;
}
/**
 * Clip a signed integer value into the 0-65535 range.
 * @param a value to clip
 * @return clipped value
 */
static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
{
    if (a&(~0xFFFF)) return (-a)>>31;
    else             return a;
}
/**
 * Clip a signed integer value into the -32768,32767 range.
 * @param a value to clip
 * @return clipped value
 */
static av_always_inline av_const int16_t av_clip_int16_c(int a)
{
    if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
    else                      return a;
}
/**
 * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
 * @param a value to clip
 * @return clipped value
 */
static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
{
    if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;
    else                                         return (int32_t)a;
}
/**
 * Clip a signed integer to an unsigned power of two range.
 * @param  a value to clip
 * @param  p bit position to clip at
 * @return clipped value
 */
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
{
    if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
    else                   return  a;
}
/**
 * Add two signed 32-bit values with saturation.
 *
 * @param  a one value
 * @param  b another value
 * @return sum with signed saturation
 */
static av_always_inline int av_sat_add32_c(int a, int b)
{
    return av_clipl_int32((int64_t)a + b);
}
/**
 * Add a doubled value to another value with saturation at both stages.
 *
 * @param  a first value
 * @param  b value doubled and added to a
 * @return sum with signed saturation
 */
static av_always_inline int av_sat_dadd32_c(int a, int b)
{
    return av_sat_add32(a, av_sat_add32(b, b));
}
/**
 * Clip a float value into the amin-amax range.
 * @param a value to clip
 * @param amin minimum value of the clip range
 * @param amax maximum value of the clip range
 * @return clipped value
 */
static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
{
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
    if (amin > amax) abort();
#endif
    if      (a < amin) return amin;
    else if (a > amax) return amax;
    else               return a;
}
/** Compute ceil(log2(x)).
 * @param x value used to compute ceil(log2(x))
 * @return computed ceiling of log2(x)
 */
static av_always_inline av_const int av_ceil_log2_c(int x)
{
    return av_log2((x - 1) << 1);
}
/**
 * Count number of bits set to one in x
 * @param x value to count bits of
 * @return the number of bits set to one in x
 */
static av_always_inline av_const int av_popcount_c(uint32_t x)
{
    x -= (x >> 1) & 0x55555555;
    x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
    x = (x + (x >> 4)) & 0x0F0F0F0F;
    x += x >> 8;
    return (x + (x >> 16)) & 0x3F;
}
/**
 * Count number of bits set to one in x
 * @param x value to count bits of
 * @return the number of bits set to one in x
 */
static av_always_inline av_const int av_popcount64_c(uint64_t x)
{
    return av_popcount((uint32_t)x) + av_popcount(x >> 32);
}
#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
/**
 * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
 *
 * @param val      Output value, must be an lvalue of type uint32_t.
 * @param GET_BYTE Expression reading one byte from the input.
 *                 Evaluated up to 7 times (4 for the currently
 *                 assigned Unicode range).  With a memory buffer
 *                 input, this could be *ptr++.
 * @param ERROR    Expression to be evaluated on invalid input,
 *                 typically a goto statement.
 */
#define GET_UTF8(val, GET_BYTE, ERROR)
    val= GET_BYTE;
    {
        uint32_t top = (val & 128) >> 1;
        if ((val & 0xc0) == 0x80)
            ERROR
        while (val & top) {
            int tmp= GET_BYTE - 128;
            if(tmp>>6)
                ERROR
            val= (val<<6) + tmp;
            top <<= 5;
        }
        val &= (top << 1) - 1;
    }
/**
 * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
 *
 * @param val       Output value, must be an lvalue of type uint32_t.
 * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
 *                  to native byte order.  Evaluated one or two times.
 * @param ERROR     Expression to be evaluated on invalid input,
 *                  typically a goto statement.
 */
#define GET_UTF16(val, GET_16BIT, ERROR)
    val = GET_16BIT;
    {
        unsigned int hi = val - 0xD800;
        if (hi < 0x800) {
            val = GET_16BIT - 0xDC00;
            if (val > 0x3FFU || hi > 0x3FFU)
                ERROR
            val += (hi<<10) + 0x10000;
        }
    }
/**
 * @def PUT_UTF8(val, tmp, PUT_BYTE)
 * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
 * @param val is an input-only argument and should be of type uint32_t. It holds
 * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
 * val is given as a function it is executed only once.
 * @param tmp is a temporary variable and should be of type uint8_t. It
 * represents an intermediate value during conversion that is to be
 * output by PUT_BYTE.
 * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
 * It could be a function or a statement, and uses tmp as the input byte.
 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
 * executed up to 4 times for values in the valid UTF-8 range and up to
 * 7 times in the general case, depending on the length of the converted
 * Unicode character.
 */
#define PUT_UTF8(val, tmp, PUT_BYTE)
    {
        int bytes, shift;
        uint32_t in = val;
        if (in < 0x80) {
            tmp = in;
            PUT_BYTE
        } else {
            bytes = (av_log2(in) + 4) / 5;
            shift = (bytes - 1) * 6;
            tmp = (256 - (256 >> bytes)) | (in >> shift);
            PUT_BYTE
            while (shift >= 6) {
                shift -= 6;
                tmp = 0x80 | ((in >> shift) & 0x3f);
                PUT_BYTE
            }
        }
    }
/**
 * @def PUT_UTF16(val, tmp, PUT_16BIT)
 * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
 * @param val is an input-only argument and should be of type uint32_t. It holds
 * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
 * val is given as a function it is executed only once.
 * @param tmp is a temporary variable and should be of type uint16_t. It
 * represents an intermediate value during conversion that is to be
 * output by PUT_16BIT.
 * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
 * in desired endianness. It could be a function or a statement, and uses tmp
 * as the input byte.  For example, PUT_BYTE could be "*output++ = tmp;"
 * PUT_BYTE will be executed 1 or 2 times depending on input character.
 */
#define PUT_UTF16(val, tmp, PUT_16BIT)
    {
        uint32_t in = val;
        if (in < 0x10000) {
            tmp = in;
            PUT_16BIT
        } else {
            tmp = 0xD800 | ((in - 0x10000) >> 10);
            PUT_16BIT
            tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);
            PUT_16BIT
        }
    }

#include "mem.h"
#ifdef HAVE_AV_CONFIG_H
#    include "internal.h"
#endif /* HAVE_AV_CONFIG_H */
#endif /* AVUTIL_COMMON_H */
/*
 * The following definitions are outside the multiple inclusion guard
 * to ensure they are immediately available in intmath.h.
 */
#ifndef av_ceil_log2
#   define av_ceil_log2     av_ceil_log2_c
#endif
#ifndef av_clip
#   define av_clip          av_clip_c
#endif
#ifndef av_clip64
#   define av_clip64        av_clip64_c
#endif
#ifndef av_clip_uint8
#   define av_clip_uint8    av_clip_uint8_c
#endif
#ifndef av_clip_int8
#   define av_clip_int8     av_clip_int8_c
#endif
#ifndef av_clip_uint16
#   define av_clip_uint16   av_clip_uint16_c
#endif
#ifndef av_clip_int16
#   define av_clip_int16    av_clip_int16_c
#endif
#ifndef av_clipl_int32
#   define av_clipl_int32   av_clipl_int32_c
#endif
#ifndef av_clip_uintp2
#   define av_clip_uintp2   av_clip_uintp2_c
#endif
#ifndef av_sat_add32
#   define av_sat_add32     av_sat_add32_c
#endif
#ifndef av_sat_dadd32
#   define av_sat_dadd32    av_sat_dadd32_c
#endif
#ifndef av_clipf
#   define av_clipf         av_clipf_c
#endif
#ifndef av_popcount
#   define av_popcount      av_popcount_c
#endif
#ifndef av_popcount64
#   define av_popcount64    av_popcount64_c
#endif

错误在行:if ((a+0x80000000u) &~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;