Visual Studio 2008发布版本不装饰DLL导出 [英] Visual Studio 2008 release build not decorating DLL exports

问题描述

我在Visual Studio 2008中构建一个C ++ DLL，供Borland C ++ Builder 6中编写的C应用程序使用。

我的调试DLL构建导出方法带下划线。然而在我的版本DLL构建方法不装饰导致链接器错误在C + + B uilder。 （对于两种构建类型，请参见下面的dumpbin.exe的输出）

我已经检查了调试和发布配置的编译器选项，看不到任何可能导致这个问题。

我已经管理它解决问题。 Borland工具implib将Visual Studio .lib文件转换为C ++ Builder .lib文件，可以添加下划线。

头文件methods.h b $ b

  #ifndef METHODS_H 
 #define METHODS_H 
 
 #ifdef ENCRYPTION_EXPORTS 
 #define DLLEXPORT __declspec（dllexport）
 #else 
 #define DLLEXPORT __declspec（dllimport）
 #endif 
 
 #ifdef __cplusplus 
 externC
 {
 #endif 
 
 DLLEXPORT BOOL EncryptString（char * szPlain，char * szEncrypted）; 
 DLLEXPORT BOOL DecryptString（char * szEncrypted，char * szPlain）; 
 DLLEXPORT BOOL EncryptInitialise（void）; 
 DLLEXPORT void EncryptExit（void）; 
 
 #ifdef __cplusplus 
} 
 #endif 
 
 #endif 
  

用于调试版本的Dumpbin.exe输出

dumpbin / EXPORTS encryption.dll

  Microsoft（R）COFF / PE Dumper版本9.00.30729.01 
版权所有（C）Microsoft Corporation。版权所有。 
 
转储文件encryption.dll 
 
文件类型：DLL 
 
包含以下对encryption.dll的导出
 
 00000000特征
 50B8B22E时间日期戳日期11月30日13:18:38 2012 
 0.00版本
 1序数基数
 4函数数量
 4数量名称
 
序数提示RVA名称
 
 1 0 000308F7 DecryptString = @ ILT + 2290（_DecryptString）
 2 1 00031635 EncryptExit = @ ILT + 5680（_EncryptExit）
 3 2 000303CF EncryptInitialise = @ ILT + 970（_EncryptInitialise）
 4 3 0003003C EncryptString = @ ILT + 55（_EncryptString）
 
摘要
 
 5000 .data 
 1000 .idata 
 13000 .rdata 
 5000 .reloc 
 1000 .rsrc 
 64000 .text 
 2F000 .textbss 
  
 
 
 
 发布版本的Dumpbin.exe输出 
 
 
 dumpbin / EXPORTS encryption.dll 
 
 
 
 
 
  Microsoft PE Dumper版本9.00.30729.01 
版权所有（C）Microsoft Corporation。版权所有。 
 
转储文件encryption.dll 
 
文件类型：DLL 
 
包含以下对encryption.dll的导出
 
 00000000特征
 50B8BE14时间日期戳记十一月30日星期三14:09:24 2012 
 0.00版本
 1序数基数
 4函数数量
 4数量名称
 
序数提示RVA名称
 
 1 0 00001A10 DecryptString 
 2 1 000012C0 EncryptExit 
 3 2 00001370 EncryptInitialise 
 4 3 00001820 EncryptString 
 
摘要
 
 4000 .data 
 4000 .rdata 
 2000 .reloc 
 1000 .rsrc 
 F000 .text 
   
 
解决方案
这里是一篇关于调用约定和名称装饰。名称装饰可能会被您项目中的* .def文件覆盖。
 
I'm building a C++ DLL in Visual Studio 2008 to be used by a C application written in Borland C++ Builder 6. 

My debug DLL build exports methods decorated with an underscore. However in my release DLL build the methods are not decorated causing linker errors in C++ Builder. (See below for output for dumpbin.exe for both build types)

I've checked the compiler options for both debug and release configuration and cannot see anything that might be causing this problem.  

I've managed it get around the problem. The Borland tool implib, which converts Visual Studio .lib files to a C++ Builder .lib files, can add an underscore. But I would like to understand why the exports are not being decorated.

Header file methods.h
#ifndef METHODS_H
#define METHODS_H

#ifdef ENCRYPTION_EXPORTS
#define DLLEXPORT __declspec(dllexport)
#else
#define DLLEXPORT __declspec(dllimport)
#endif

#ifdef __cplusplus
extern "C"
{
#endif

DLLEXPORT BOOL EncryptString(char *szPlain, char *szEncrypted);
DLLEXPORT BOOL DecryptString(char *szEncrypted, char *szPlain);
DLLEXPORT BOOL EncryptInitialise(void);
DLLEXPORT void EncryptExit(void);

#ifdef __cplusplus
}
#endif

#endif
Dumpbin.exe output for debug build

  
dumpbin /EXPORTS encryption.dll


Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation.  All rights reserved.

Dump of file encryption.dll

File Type: DLL

  Section contains the following exports for encryption.dll

    00000000 characteristics
    50B8B22E time date stamp Fri Nov 30 13:18:38 2012
        0.00 version
           1 ordinal base
           4 number of functions
           4 number of names

    ordinal hint RVA      name

          1    0 000308F7 DecryptString = @ILT+2290(_DecryptString)
          2    1 00031635 EncryptExit = @ILT+5680(_EncryptExit)
          3    2 000303CF EncryptInitialise = @ILT+970(_EncryptInitialise)
          4    3 0003003C EncryptString = @ILT+55(_EncryptString)

  Summary

        5000 .data
        1000 .idata
       13000 .rdata
        5000 .reloc
        1000 .rsrc
       64000 .text
       2F000 .textbss
Dumpbin.exe output for release build

  
dumpbin /EXPORTS encryption.dll


Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation.  All rights reserved.

Dump of file encryption.dll

File Type: DLL

  Section contains the following exports for encryption.dll

    00000000 characteristics
    50B8BE14 time date stamp Fri Nov 30 14:09:24 2012
        0.00 version
           1 ordinal base
           4 number of functions
           4 number of names

    ordinal hint RVA      name

          1    0 00001A10 DecryptString
          2    1 000012C0 EncryptExit
          3    2 00001370 EncryptInitialise
          4    3 00001820 EncryptString

  Summary

        4000 .data
        4000 .rdata
        2000 .reloc
        1000 .rsrc
        F000 .text

解决方案
here is an article about calling conventions and name decoration. the name decoration may be overruled by a *.def file in your project.

                        
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