Golang如何调用windows下的dll动态库中的函数

package mainimport ( 'fmt' 'syscall' 'time' 'unsafe')const ( MB_OK = 0x00000000 MB_OKCANCEL = 0x00000001 MB_ABORTRETRYIGNORE = 0x00000002 MB_YESNOCANCEL = 0x00000003 MB_YESNO = 0x00000004 MB_RETRYCANCEL = 0x00000005 MB_CANCELTRYCONTINUE = 0x00000006 MB_ICONHAND = 0x00000010 MB_ICONQUESTION = 0x00000020 MB_ICONEXCLAMATION = 0x00000030 MB_ICONASTERISK = 0x00000040 MB_USERICON = 0x00000080 MB_ICONWARNING = MB_ICONEXCLAMATION MB_ICONERROR = MB_ICONHAND MB_ICONINFORMATION = MB_ICONASTERISK MB_ICONSTOP = MB_ICONHAND MB_DEFBUTTON1 = 0x00000000 MB_DEFBUTTON2 = 0x00000100 MB_DEFBUTTON3 = 0x00000200 MB_DEFBUTTON4 = 0x00000300)func abort(funcname string, err syscall.Errno) { panic(funcname + ' failed: ' + err.Error())}var ( // kernel32, _ = syscall.LoadLibrary('kernel32.dll') // getModuleHandle, _ = syscall.GetProcAddress(kernel32, 'GetModuleHandleW') user32, _ = syscall.LoadLibrary('user32.dll') messageBox, _ = syscall.GetProcAddress(user32, 'MessageBoxW'))func IntPtr(n int) uintptr { return uintptr(n)}func StrPtr(s string) uintptr { return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))}func MessageBox(caption, text string, style uintptr) (result int) { ret, _, callErr := syscall.Syscall9(messageBox, 4, 0, StrPtr(text), StrPtr(caption), style, 0, 0, 0, 0, 0) if callErr != 0 { abort('Call MessageBox', callErr) } result = int(ret) return}//func GetModuleHandle() (handle uintptr) {// if ret, _, callErr := syscall.Syscall(getModuleHandle, 0, 0, 0, 0); callErr != 0 {// abort('Call GetModuleHandle', callErr)// } else {// handle = ret// }// return//}// windows下的第二种DLL方法调用func ShowMessage2(title, text string) { user32 := syscall.NewLazyDLL('user32.dll') MessageBoxW := user32.NewProc('MessageBoxW') MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))}func main() { // defer syscall.FreeLibrary(kernel32) defer syscall.FreeLibrary(user32) //fmt.Printf('Retern: %dn', MessageBox('Done Title', 'This test is Done.', MB_YESNOCANCEL)) num := MessageBox('Done Title', 'This test is Done.', MB_YESNOCANCEL) fmt.Printf('Get Retrun Value Before MessageBox Invoked: %dn', num) ShowMessage2('windows下的第二种DLL方法调用', 'HELLO !') time.Sleep(3 * time.Second)}func init() { fmt.Print('Starting Upn')}

补充：go 调用windows dll 的三种方法

第三种方法是从Gosrcinternalsyscallwindowssysdll源码中找到的，三种方法的具体区别还不是很明晰，

初步判断：lazy应该是相当于动态库，其余两种直接把库加载到内存。

package mainimport('fmt''syscall''time' 'unsafe')const ( MB_OK = 0x00000000 MB_OKCANCEL = 0x00000001 MB_ABORTRETRYIGNORE = 0x00000002 MB_YESNOCANCEL = 0x00000003 MB_YESNO = 0x00000004 MB_RETRYCANCEL = 0x00000005 MB_CANCELTRYCONTINUE = 0x00000006 MB_ICONHAND = 0x00000010 MB_ICONQUESTION = 0x00000020 MB_ICONEXCLAMATION = 0x00000030 MB_ICONASTERISK = 0x00000040 MB_USERICON = 0x00000080 MB_ICONWARNING = MB_ICONEXCLAMATION MB_ICONERROR = MB_ICONHAND MB_ICONINFORMATION = MB_ICONASTERISK MB_ICONSTOP = MB_ICONHAND MB_DEFBUTTON1 = 0x00000000 MB_DEFBUTTON2 = 0x00000100 MB_DEFBUTTON3 = 0x00000200 MB_DEFBUTTON4 = 0x00000300) func abort(funcname string, err syscall.Errno) { panic(funcname + ' failed: ' + err.Error())} var ( user32, _ = syscall.LoadLibrary('user32.dll') messageBox, _ = syscall.GetProcAddress(user32, 'MessageBoxW')) func IntPtr(n int) uintptr { return uintptr(n)} func StrPtr(s string) uintptr { return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))} func MessageBox(caption, text string, style uintptr) (result int) { ret, _, callErr := syscall.Syscall9(messageBox, 4, 0, StrPtr(text), StrPtr(caption), style, 0, 0, 0, 0, 0) if callErr != 0 { abort('Call MessageBox', callErr) } result = int(ret) return} //func GetModuleHandle() (handle uintptr) {// if ret, _, callErr := syscall.Syscall(getModuleHandle, 0, 0, 0, 0); callErr != 0 {// abort('Call GetModuleHandle', callErr)// } else {// handle = ret// }// return//} // windows下的第二种DLL方法调用func ShowMessage2(title, text string) { user32 := syscall.NewLazyDLL('user32.dll') MessageBoxW := user32.NewProc('MessageBoxW') MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))} // windows下的第三种DLL方法调用func ShowMessage3(title, text string) { user32,_ := syscall.LoadDLL('user32.dll') MessageBoxW,_ := user32.FindProc('MessageBoxW') MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))} func main() { defer syscall.FreeLibrary(user32) num := MessageBox('Done Title', 'This test is Done.', MB_YESNOCANCEL) fmt.Printf('Get Retrun Value Before MessageBox Invoked: %dn', num) ShowMessage2('windows下的另一种DLL方法调用', 'HELLO !')ShowMessage3('windows下的第三种DLL方法调用', 'lyslyslys !') time.Sleep(3 * time.Second)} func init() { fmt.Print('Starting Upn')} ​

以上为个人经验，希望能给大家一个参考，也希望大家多多支持优爱好网。如有错误或未考虑完全的地方，望不吝赐教。