我已经在Windows 7 64位上用C++准备了一个非常简单的DLL程序。我制作了两个版本,即64位和32位。我使用链接器和带有-m32
标志设置的编译器进行编译的32位项目。我使用-std=c++11
。这是它的代码:
主文件
#ifndef __MAIN_H__
#define __MAIN_H__
#include <windows.h>
/* To use this exported function of dll, include this header
* in your project.
*/
#ifdef BUILD_DLL
#define DLL_EXPORT __declspec(dllexport)
#else
#define DLL_EXPORT __declspec(dllimport)
#endif
#ifdef __cplusplus
extern "C"
{
#endif
void DLL_EXPORT SomeFunction(const LPCSTR sometext);
#ifdef __cplusplus
}
#endif
#endif // __MAIN_H__
main.cpp
#include "main.h"
// a sample exported function
void DLL_EXPORT SomeFunction(const LPCSTR sometext)
{
MessageBoxA(0, sometext, "DLL Message", MB_OK | MB_ICONINFORMATION);
}
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
MessageBoxA(0, "DLL_PROCESS_ATTACH", "DLL Message", MB_OK | MB_ICONINFORMATION);
break;
case DLL_PROCESS_DETACH:
MessageBoxA(0, "DLL_PROCESS_DETACH", "DLL Message", MB_OK | MB_ICONINFORMATION);
break;
case DLL_THREAD_ATTACH:
MessageBoxA(0, "DLL_THREAD_ATTACH", "DLL Message", MB_OK | MB_ICONINFORMATION);
break;
case DLL_THREAD_DETACH:
MessageBoxA(0, "DLL_THREAD_DETACH", "DLL Message", MB_OK | MB_ICONINFORMATION);
break;
}
return TRUE; // succesful
}
DLL可以很好地编译,并且可以在32位版本中很好地工作。但是,当我通过删除所有内容的
-m32
选项编译为64位时,出现链接器错误:obj \ Release \ main.o:main.cpp ||未定义对`_imp_MessageBoxA'|的引用
用
-m64
替换无济于事。这是我的MingW版本详细信息:Using built-in specs.
COLLECT_GCC=x86_64-w64-mingw32-g++.exe
COLLECT_LTO_WRAPPER=E:/Program\ Files\ (x86)/CodeBlocks/MinGW/bin/../libexec/gcc/x86_64-w64-mingw32/5.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-5.1.0/configure --build=x86_64-w64-mingw32 --enable-targets=all --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-libgomp --enable-lto --enable-graphite --enable-cxx-flags=-DWINPTHREAD_STATIC --disable-build-with-cxx --disable-build-poststage1-with-cxx --enable-libstdcxx-debug --enable-threads=posix --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-libstdcxx-threads --enable-libstdcxx-time --with-gnu-ld --disable-werror --disable-nls --disable-win32-registry --prefix=/mingw64tdm --with-local-prefix=/mingw64tdm --with-pkgversion=tdm64-1 --with-bugurl=http://tdm-gcc.tdragon.net/bugs
Thread model: posix
gcc version 5.1.0 (tdm64-1)
我可能做错了什么?是否可能需要包含一个特殊的64位Windows header ?非常感谢您的指导! :)
最佳答案
固定,我是个白痴。很久以前,我已经在“编译器和调试器”下的链接器设置中将-m32
设置为永久标记。删除它,现在可以正常使用了。
关于c++ - 使用CodeBlocks编译64位DLL会导致链接器错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37447097/