C 未定义的引用`WinMain@16'mingw正在转换为DLL
我正在尝试将给定的C代码转换为DLL文件。我尝试编译给定的代码,但不起作用。它给了我一个错误C 未定义的引用`WinMain@16'mingw正在转换为DLL,c,visual-studio,C,Visual Studio,我正在尝试将给定的C代码转换为DLL文件。我尝试编译给定的代码,但不起作用。它给了我一个错误 .\sample.cpp:16:66: warning: passing NULL to non-pointer argument 5 of 'void* CreateThread(LPSECURITY_ATTRIBUTES, DWORD, LPTHREAD_START_ROUTINE, PVOID, DWORD, PDWORD)' [-Wconversion-null] c:/mingw/bin/..
.\sample.cpp:16:66: warning: passing NULL to non-pointer argument 5 of 'void* CreateThread(LPSECURITY_ATTRIBUTES, DWORD, LPTHREAD_START_ROUTINE, PVOID, DWORD, PDWORD)' [-Wconversion-null]
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingw32.a(main.o):(.text.startup+0xb0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
我已经试着在网上查找答案,同时查看语法,似乎还可以
我的代码
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
extern "C" __declspec(dllexport)
DWORD WINAPI MessageBoxThread(LPVOID lpParam) {
MessageBox(NULL, "Hello world!", "Hello World!", NULL);
return 0;
}
extern "C" __declspec(dllexport)
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved) {
switch (ul_reason_for_call) {
case DLL_PROCESS_ATTACH:
CreateThread(NULL, NULL, MessageBoxThread, NULL, NULL, NULL);
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
我正在使用Visual Studio 2017社区版15.8.1版作为参考。我使用File | New | project创建了一个简单的DLL项目,并删除了除dllmain.cpp之外的所有文件。我必须修改项目属性以禁用预编译头的使用。dllmain.cpp中的代码为: 链接:
/OUT:"D:\GNUHome\Projects\testDll\Debug\testDll.dll" /MANIFEST /NXCOMPAT /PDB:"D:\GNUHome\Projects\testDll\Debug\testDll.pdb" /DYNAMICBASE "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib"/IMPLIB:"D:\GNUHome\Projects\testDll\Debug\testDll.lib" /DEBUG /DLL /MACHINE:X86 /INCREMENTAL /PGD:"D:\GNUHome\Projects\testDll\Debug\testDll.pgd" /SUBSYSTEM:WINDOWS /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Debug\testDll.dll.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /TLBID:1
由于您没有使用本机Microsoft toos CL和LINK,因此您需要查找或准备所使用的工具链之间的映射,您没有提到该工具链,但它似乎来自错误消息和Microsoft的工具链
如果我不得不猜测,我会怀疑问题是由于链接命令行中的/DLL标志引起的。您可能需要使用与mingw共享的东西。但是,这只是猜测。在visual studio中,检查属性并检查“系统”属性是否设置为DLL而不是Windows。您的代码似乎是正确的,但是错误表明您是为windows应用程序编译的。@thurizas我想我在VS CodeVS code中找不到它。VS code是一个文本编辑器。VisualStudio是一个IDE。在VS代码中找不到该选项。但是您可以使用mingw编译dll。您仍然应该为此使用Visual Studio IDE。显示如何调用编译器。可能您是在告诉它构建一个.exe而不是.dll
/JMC /permissive- /GS /analyze- /W3 /Zc:wchar_t /ZI /Gm- /Od /sdl /Fd"Debug\vc141.pdb" /Zc:inline /fp:precise /D "WIN32" /D "_DEBUG" /D "TESTDLL_EXPORTS" /D "_WINDOWS" /D "_USRDLL" /D "_WINDLL" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /RTC1 /Gd /Oy- /MDd /FC /Fa"Debug\" /EHsc /nologo /Fo"Debug\" /Fp"Debug\testDll.pch" /diagnostics:classic
/OUT:"D:\GNUHome\Projects\testDll\Debug\testDll.dll" /MANIFEST /NXCOMPAT /PDB:"D:\GNUHome\Projects\testDll\Debug\testDll.pdb" /DYNAMICBASE "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib"/IMPLIB:"D:\GNUHome\Projects\testDll\Debug\testDll.lib" /DEBUG /DLL /MACHINE:X86 /INCREMENTAL /PGD:"D:\GNUHome\Projects\testDll\Debug\testDll.pgd" /SUBSYSTEM:WINDOWS /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Debug\testDll.dll.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /TLBID:1