[Mingw与VC++互操作] MingW使用VC编译的dll

采用ming C编译，将ming/bin加入path
(注:pythonxx.dll一般在winnt/system32下，以下操作后文件如xx.def,xx.a放到python/libs下)

1)pexports python24.dll >python24.def

2)dlltool --dllname python24.dll --def python24.def --output-lib libpython24.a

使用sqlite3,只有.dll和.def文件,为了直接用它,需要一个lib文件,使用以下命令行好了:) lib /def:xx.def /out:xx.lib lib是vc++带的工具. 下面是ms 官方的连接: http://support.microsoft.com/kb/q131313/

pexports 这个工具似乎在vc和mingw默认安装里都没有


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 /EXPORTS /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.