Question

Using package lxn/win in main:

win.EnumChildWindows(hw, printme, 0)

Then after main:

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

I get:

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

error:exit status 2

I don't understand the error message.

Answer 1

我让它可以使用：

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
}

请参见lxn/win issue 19：

回调签名是错误的：如果函数应继续枚举，则它必须返回类型为int32（C BOOL）的非零值。
  See MSDN。

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

EnumChildWindows callback function in golang

1 个答案: