即使我在声明中使用extern“C”,GNU GCC 也会破坏我导入的函数名称。
我刚刚开始使用 Code::Blocks 和 GNU GCC 将现有项目从 Borland C++ Builder 6.0 Pro 迁移出来并开发一些 future 的项目。从长远来看,我将 1) 制作 .dll,并将其交给使用各种平台的最终开发人员(即 .dll 将不会严格保留在内部。)2) 在Code::使用这些 .dll 的 block 。
当我尝试迁移在 Borland C++ Builder 下运行的第一个项目时,即使我将导入的函数名称声明为“extern“C””,它也会损坏它们。
例如,以下(简化的)代码在编译器开始链接后会产生错误:
#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()
}
此代码会产生以下错误:
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 来破坏 DirectSoundCreate 函数名称,即使我使用的是微软的 dsound.h 文件(将其放入“extern “C”” block 中)并且它使用 _ 来破坏 CrimsonCommandProc imp__ 即使我将所有内容都放在“extern“C”的范围内。如何让 GNU GCC 编译器停止修改名称? (无论是导入 dll 函数时还是最终创建 dll 时)
或者,我并没有嫁给 GNU GCC。如果有另一个编译器 A) 免费、B) 跨平台、C) 可处理 DirectX .lib 文件(最好是新版本发布时支持的编译器),我可以使用它。
最佳答案
DirectSoundCreate 被声明为 WINAPI,一个 __stdcall 的宏:
extern HRESULT WINAPI DirectSoundCreate(...);
这给了它@12装饰。您可能会收到链接器错误,因为您没有链接 dsound.lib。或者您拥有的任何版本都缺少导出,这在 mingw 版本的 SDK 文件中并不罕见。
您获得 __imp 前缀是因为您声明了函数 __declspec(dllimport)。只需删除它即可。
关于c++ - 如何阻止 GNU GCC 修改 dll 导入函数名称,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8992906/