go - golang 中的 EnumChildWindows 回调函数

Question

在 main 中使用包 lxn/win:

win.EnumChildWindows(hw, printme, 0)

然后在 main 之后:

func printme(HWND win.HANDLE, LPARAM uintptr) { //HWND hwnd, LPARAM lParam
    spew.Dump(HWND)
}

我得到:

.\test.go:40: cannot use printme (type func(win.HANDLE, uintptr)) as type uintptr in argument to win.EnumChildWindows

error:exit status 2

我不明白错误信息。

Answer 1

我让它工作于:

win.EnumChildWindows(hwnd, syscall.NewCallback(printme), 0)

func printme(hwnd uintptr, lParam uintptr) uintptr {
    spew.Dump(hwnd)
    fmt.Printf("getWindowText: '%s'\n", getWindowText(hwnd))
    return 1 // true to continue
}

参见 lxn/win issue 19 :

The callback signature is wrong: it has to return a value of type int32 (C BOOL) that is nonzero if the function should continue enumeration.
See MSDN.

For example, it could be:

func printme(hwnd uintptr, lParam uintptr) int32 {
    spew.Dump(hwnd)
    return 1 // true to continue
}