Dll2lib探究

//为无LIB的DLL制作LIB函数符号输入库  

  本文介绍了在VC中针对无LIB时的DLL隐式链接,制作可供VC++使用的LIB函数符号输入库。具体步骤如下：  

   

    一、使用VC++的工具DUMPBIN将DLL中的导出函数表导出到一定义(.DEF)文件  

  EXAMPLE：    

   

  DUMPBIN   VideoDeCoder.dll   /EXPROTS   /OUT:VideoDeCoder.def  

    二、将导出的.DEF文件整理为一符合.DEF个数的函数导出文件  

  EXAMPLE：VideoDeCoder.DEF   文件内容如下Dump   of   file   VideoDeCoder.dll                                                                      

                                                                                                                                                 

                  File   Type:   DLL                                                                                                    

                                                                                                                                                 

                      Section   contains   the   following   exports   for   VideoDeCoder.dll      

                                                                                                                                                 

                                        0   characteristics                                                                        

                          3D49E48F   time   date   stamp   Fri   Aug   02   09:46:55   2002                      

                                  0.00   version                                                                                        

                                        1   ordinal   base                                                                              

                                      11   number   of   functions                                                                

                                      11   number   of   names                                                                        

                                                                                                                                                 

                          ordinal   hint   RVA             name                                                                    

                                                                                                                                                 

                                      1         0   00010F60   _TM_ClearDecoderBuff@4                                

                                      2         1   00010E80   _TM_CloseDecoder@4                                        

                                      3         2   00010F00   _TM_DecodePicture@4                                      

                                      4         3   00010ED0   _TM_DecodePictureHeader@4                          

                                      5         4   00010FD0   _TM_GetFileEnd@4                                            

                                      6         5   00011030   _TM_GetUValue@4                                              

                                      7         6   00011060   _TM_GetVValue@4                                              

                                      8         7   00011000   _TM_GetYValue@4                                              

                                      9         8   00010E10   _TM_OpenDecoder@8                                          

                                    10         9   00010F30   _TM_ReturnType@4                                            

                                    11         A   00010F90   _TM_SetFileEnd@8                                            

                                                                                                                                                 

                      Summary                                                                                                              

                                                                                                                                                 

                                  2000   .data                                                                                            

                                  1000   .rdata                                                                                          

                                  1000   .reloc                                                                                          

                                15000   .text    

  按照以下方法整理:  

  1)添加LIB说明   LIBRARY   "VideoDeCoder"                         ;"xx"为DLL名称  

  DESCRIPTION   "VideoDeCoder   library"      

  2)去掉导出函数说明端以外的内容,在LIB说明下添加   "EXPROTS"   说明导出函数   LIBRARY   "VideoDeCoder"  

  DESCRIPTION   "VideoDeCoder   library"  

   

  EXPORTS  

                          ordinal   hint   RVA             name                                                      

                                                                                                                                   

                                      1         0   00010F60   _TM_ClearDecoderBuff@4                          

                                      2         1   00010E80   _TM_CloseDecoder@4                          

                                      3         2   00010F00   _TM_DecodePicture@                          

                                      4         3   00010ED0   _TM_DecodePictureH                          

                                      5         4   00010FD0   _TM_GetFileEnd@4                              

                                      6         5   00011030   _TM_GetUValue@4                                

                                      7         6   00011060   _TM_GetVValue@4                                

                                      8         7   00011000   _TM_GetYValue@4                                

                                      9         8   00010E10   _TM_OpenDecoder@8                            

                                    10         9   00010F30   _TM_ReturnType@4                              

                                    11         A   00010F90   _TM_SetFileEnd@8    

  3)将所有的函数放至行首,去掉   "hint"   和   "RVA"   数据,留下函数的序号   "ordinal"   ,在序号前加上   "@"   符号   形成   "_导出函数名@参数字节和   @序号"   此种格式(__stdcall   方式调用导出的函数符号是   "函数名称@参数字节和").   最后形成.DEF文件如下:   LIBRARY   "VideoDeCoder"  

      DESCRIPTION   "VideoDeCoder   library"  

   

      EXPORTS  

               

      TM_ClearDecoderBuff@4                           @1          

      TM_CloseDecoder@4                                   @2          

      TM_DecodePicture@4                                 @3          

      TM_DecodePictureHeader@4                     @4          

      TM_GetFileEnd@4                                       @5          

      TM_GetUValue@4                                         @6          

      TM_GetVValue@4                                         @7          

      TM_GetYValue@4                                         @8          

      TM_OpenDecoder@8                                     @9          

      TM_ReturnType@4                                     @10          

      TM_SetFileEnd@8                                     @11    

    三、使用VC++的LIB工具,带/DEF:(.def文件名)   /MACHINE:IX86(80X86机器),就输出符合VC++格式的的LIB文件了.    

  EXAMPLE:LIB   /DEF:VideoDeCoder.def   /MACHINE:IX86  

    四、接时带上LIB文件链接;注意的是当有些动态库DUMPBIN的只有函数名,无"@nn"的参数格式,如C++Builder写的DLL,输出就只有函数名符号,链接时就会报错:   error   LNK2002:unresolved   external   symbol   "functionname@nn"   提示程序中引入的函数符号无法识别,这时只要将DEF文件中相应的函数名称改为functionname@nn方式,重新建立   LIB,重新链接即可.  

   

   

  另:有一个叫dll2lib的软件更方便一些，就是确认函数参数和返回值有点