go LoadDLL whose dependencies are not in System or System32
php小编百草在这里为大家介绍一种常见的错误提示:“go LoadDLL 其依赖项不在 System 或 System32 中”。当我们在使用go语言编写程序时,有时会遇到这个错误提示,表示我们的程序在加载动态链接库时找不到依赖项所在的路径。这个问题可能会导致程序无法正常运行,因此我们需要解决这个问题才能继续进行开发工作。在本文中,我们将详细介绍如何解决这个错误,并提供一些常见的解决方法和技巧。
问题内容
我正在尝试从 windows 上的 go 加载库,如下所示:
citect, err := syscall.loaddll("c:\\program files (x86)\\aveva plant scada\\bin\\bin (x64)ctapi.dll")
问题是该库在该目录中也有依赖项。结果是错误“找不到指定的模块”。我很确定它失败是因为其他 dll 中未满足的依赖关系。
系统调用是否有某种方法可以强制 dll 搜索路径?
更新
我认为我遇到的问题是因为我指定了 load_library_search_user_dirs 但我尝试加载的库也需要标准搜索路径。我添加了 load_library_search_default_dirs,现在它给了我一个有意义的句柄。
func main() { fmt.Println("hello") dllPath := "C:\\Program Files (x86)\\AVEVA Plant SCADA\\Bin\\Bin (x64)" kernel, _ := windows.LoadDLL("kernel32.dll") defer kernel.Release() sdd, err := kernel.FindProc("SetDefaultDllDirectories") if err != nil { panic(err) } r1, _, err := sdd.Call(windows.LOAD_LIBRARY_SEARCH_SYSTEM32) if r1 == 0 { panic(err) } addd, err := kernel.FindProc("AddDllDirectory") if err != nil { panic(err) } chars := StringToWideCharPtr(dllPath) r1, _, err = addd.Call(uintptr(unsafe.Pointer(chars))) fmt.Printf("result of add dll directory: %d\n", r1) if r1 == 0 { panic(err) } h, err := windows.LoadLibraryEx("CtApi.dll", 0, 0) if err != nil { panic(err) } fmt.Printf("library: %v\n", h) }
解决方法
尝试在golang.org/x/sys/windows
包中使用loadlibraryex
,它支持load_library_search_*
标志(参见使用 load_library_search 标志的搜索顺序)。
package main import ( "golang.org/x/sys/windows" ) func main() { name := "C:\\Program Files (x86)\\AVEVA Plant SCADA\\Bin\\Bin (x64)CtApi.dll" h, err := windows.LoadLibraryEx(name, 0, windows.LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR) if err != nil { panic(err) } dll := &windows.DLL{ Name: name, Handle: h, } // use the dll }
请注意,load_library_search_*
标志并非在所有 windows 版本上都可用。请参阅此处的代码注释。
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