fix: rebuild MES as compilable go-zero+ent backend (renamed bj_power_mes), restore 3 workstation projects from pristine original, align naming; all Go projects go build clean

bj_power_mes/single.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	modkernel32     = syscall.NewLazyDLL("kernel32.dll")
+	procCreateMutex = modkernel32.NewProc("CreateMutexW")
+	procCloseHandle = modkernel32.NewProc("CloseHandle")
+	user32          = syscall.NewLazyDLL("user32.dll")
+	procMessageBox  = user32.NewProc("MessageBoxW")
+)
+
+const MB_OK = 0x00000000
+
+const MB_ICONWARNING = 0x00000030
+
+func MessageBox(title, msg string) {
+	procMessageBox.Call(
+		0,
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(msg))),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(title))),
+		MB_OK|MB_ICONWARNING,
+	)
+}
+
+var ErrAlreadyExists = fmt.Errorf("程序已在运行")
+
+func createMutex(name string) (uintptr, error) {
+	n, _ := syscall.UTF16PtrFromString(name)
+
+	r, _, err := procCreateMutex.Call(
+		0,
+		0,
+		uintptr(unsafe.Pointer(n)),
+	)
+
+	if r == 0 {
+		return 0, err
+	}
+
+	if errno, ok := err.(syscall.Errno); ok && errno == 183 { // ERROR_ALREADY_EXISTS
+		return 0, ErrAlreadyExists
+	}
+
+	return r, nil
+}
+
+func lock() {
+	mutex, err := createMutex("back_cover_mutex")
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer procCloseHandle.Call(mutex)
+}