Question

GNU GCC正在修改我导入的函数名称，即使我在声明中使用 extern “C”。

我刚开始使用Code :: Blocks和GNU GCC从Borland C ++ Builder 6.0 Pro迁移现有项目并开发一些未来的项目。从长远来看，我将1）制作.dll，我想交给使用各种平台的终端开发人员（即.dll不会严格保留在内部。）和2）制作程序Code ::使用这些.dll的块。

当我尝试迁移第一个在Borland C ++ Builder下工作的项目时，即使我将它们声明为“extern”C“，它也会破坏导入的函数名称。”

例如，以下（简化）代码在编译器开始链接后产生错误：

   #include <windows.h>

   #include <stdio.h>

   #include <cstdlib>

   #include "dsound.h"

   //#include "CGG_Cpp_DInterface.h"
   //The following are relevent items taken from CGG_Cpp_DInterface.h
   struct CrimsonReply1{
   unsigned int Echo;
   unsigned int Result;
   unsigned int ReplyType;
   unsigned int Reserved1;
   unsigned int Reserved2;
   char* OutputString;
   double Reply[32];
   };

   extern "C" __declspec(dllimport) int CrimsonCommandProc(/*I'm not going to list all the arguments here*/);
   extern "C" __declspec(dllimport) int TranslateCrimsonReply1(int, CrimsonReply1*, int);
   #define CGG_SETUP               0x20000001
   #define CGG_SHUTDOWN            0x20000005
   #define CGG_WINDOWED            0x0000002F
   #define CGG_RECTANGLE           0x00000024
   #define CGG_STRETCHTOCLIENT     0x00000028
   #define CGG_DUMPALLREPLIES      0
   //End of items taken from CGG_Cpp_DInterface.h
   extern "C" LRESULT CALLBACK WndProc(HWND hWnd, UINT messg, WPARAM wParam, LPARAM lParam );

   char szProgName[] = "Age Games:  Animal Reader";
   char message[] = "";
   extern "C"{

   int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPreInst, LPSTR lpszCmdLine, int nCmdShow)
   { //Win32 entry-point routine
     MSG WinEvent;//long pointer to an event message sent by Windows to the application
     WNDCLASSEX WinClass;//A Windows Class Struct
     RECT WindowRect;//A structure to describe the position and size of the window.
     HWND WinHand;

     /*Other Variables-------------------------------------------------------------*/
     CrimsonReply1 CrimsonReply;


     /*------------------------------------------------------------------------------
     Set up a window, register it, and create it.
     ------------------------------------------------------------------------------*/

     /*set up window class and register it*/
     /*All the standard window initialization is in here.  It's not relevent to the problem.*/
    /*------------------------------------------------------------------------------
    begin the message loop
    ------------------------------------------------------------------------------*/

    LPDIRECTSOUND* DirectSoundObject;
    HRESULT Result = DirectSoundCreate(NULL, DirectSoundObject, NULL);
    if (Result == DS_OK && *DirectSoundObject) Result = (*DirectSoundObject)->SetCooperativeLevel(WinHand, DSSCL_NORMAL);
    if (Result != DS_OK) return(0);
    int ReplyPointer = CrimsonCommandProc(CGG_SETUP,NULL,(double)(int)WinHand,NULL,CGG_WINDOWED,NULL,
                              CGG_RECTANGLE,NULL,800,NULL,600,NULL,
                              CGG_STRETCHTOCLIENT);
    if (ReplyPointer) ReplyPointer = TranslateCrimsonReply1(ReplyPointer, &CrimsonReply, CGG_DUMPALLREPLIES);

    while(GetMessage(&WinEvent, NULL, 0, 0))
    {
      DispatchMessage(&WinEvent);
    }
    /*------------------------------------------------------------------------------
    Shutdown.
    ------------------------------------------------------------------------------*/

    ReplyPointer = CrimsonCommandProc(CGG_SHUTDOWN);
    if (ReplyPointer) ReplyPointer = TranslateCrimsonReply1(ReplyPointer, &CrimsonReply, CGG_DUMPALLREPLIES);

    return(WinEvent.wParam);
  } //end of WinMain()

  }

此代码产生以下错误：

  C:\Development\AnimalReader\Animal Reader.cpp|91|undefined reference to `DirectSoundCreate@12'|
  C:\Development\AnimalReader\Animal Reader.cpp|96|undefined reference to `_imp__CrimsonCommandProc'|
  C:\Development\AnimalReader\Animal Reader.cpp|97|undefined reference to `_imp__TranslateCrimsonReply1'|
  C:\Development\AnimalReader\Animal Reader.cpp|107|undefined reference to `_imp__CrimsonCommandProc'|
  C:\Development\AnimalReader\Animal Reader.cpp|108|undefined reference to `_imp__TranslateCrimsonReply1'|

因此，它使用@ 12修改DirectSoundCreate函数名称，即使我使用的是microsoft的dsound.h文件（将其置于'extern“C”'块中）并且它使用 _重写CrimsonCommandProc imp __ 即使我把所有东西都放在'extern'C“范围内。”如何让GNU GCC编译器停止修改名称？（两者都用于导入dll函数，最终用于创建dll时）

或者，我没有与GNU GCC结婚。如果有另一个编译器是A）Free，B）跨平台，而且C）可以与DirectX .lib文件一起使用（最好是在新版本发布时会有支持的东西），我可以使用它。

Answer 1

DirectSoundCreate声明为WINAPI，是__stdcall的宏：

 extern HRESULT WINAPI DirectSoundCreate(...);

它赋予它@ 12装饰。您可能会收到链接器错误，因为您没有链接dsound.lib。或者你的任何版本都缺少导出，在SDK文件的mingw版本中并不罕见。

您正在获取__imp前缀，因为您声明了函数__declspec（dllimport）。只需删除它。

如何阻止GNU GCC破坏dll导入函数名称

1 个答案: