Comments (10)
HuakunShen
commented on September 4, 2024
It seems like doing this makes image writing works on Linux Ubuntu, even without triggering changed. Why does this happen?
And this will block the program.
changed := clipboard.Write(clipboard.FmtImage, sampleImgBuf)
select {
case <-changed:
println(`Image Updated`)
}from clipboard.
changkun
commented on September 4, 2024
On Linux, you must keep the application running so that others can read your data. See #15 for another discussion. Closing because this is not a bug, and feel free to reopen the issue if this is actually a bug.
from clipboard.
HuakunShen
commented on September 4, 2024
@changkun Thanks, I kind of noticed that the program has to be running. I did a work-around with xclip.
Is it the same on Windows? I also can't write image on Windows.
from clipboard.
changkun
commented on September 4, 2024
That's not a requirement on Windows. Is the problem reproducible on latest release?
from clipboard.
HuakunShen
commented on September 4, 2024
@changkun Yes I tried to write an image on Windows on the latest release and it doesn't work.
Here is my sample code.
package main
import (
"encoding/base64"
"golang.design/x/clipboard"
"log"
)
func main() {
if err := clipboard.Init(); err != nil {
log.Fatal(err)
}
base64Str := "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"
imgBuf, err := base64.StdEncoding.DecodeString(base64Str)
if err != nil {
log.Fatal(err)
}
clipboard.Write(clipboard.FmtImage, imgBuf)
}from clipboard.
HuakunShen
commented on September 4, 2024
And if I use select to monitor changed, there is a deadlock.
changed := clipboard.Write(clipboard.FmtImage, imgBuf)
select {
case <-changed:
println(`"text data" is no longer available from clipboard.`)
}fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive (nil chan)]:
main.main()
C:/Users/username/Desktop/clipboard-app/main.go:20 +0xce
from clipboard.
changkun
commented on September 4, 2024
Is your image png encoded?
from clipboard.
HuakunShen
commented on September 4, 2024
@changkun Yes, if you copy the base64 string to https://onlinepngtools.com/convert-base64-to-png
The image can be rendered.
from clipboard.
HuakunShen
commented on September 4, 2024
Wait, it seems like it's not png encoded even if it can be displayed.
I tried to take a screenshot and read it to string with go clipboard, then write it back. It works!
So does this mean other type of image encoding are not supported?
I will experiment a few more things, thanks!
from clipboard.
changkun
commented on September 4, 2024
As documented in the API, the image buffer must be png encoded: https://pkg.go.dev/golang.design/x/clipboard#Write
It is recommended that you encode it using image/png package to encode the bytes buffer
There are underlying implementation reasons, but it is not important for users who are not interested in the details.
from clipboard.
Related Issues (20)
- can't work in the win service HOT 5
- Build fails with "error: implicit declaration of function 'nanosleep'" HOT 1
- PNG data overwritten on Windows HOT 4
- How to watch copy file in windows10 HOT 3
- First thanks for your contribution. Maybe it's a stupid question, may i ask why can`t copy jpg image HOT 1
- Feature Request: Support to read and write raw content (without any formatting) from and into clipboards
- Housekeeping: update golang version and library dependencies HOT 2
- Windows 32-bit system will get stuck when executing. HOT 3
- Windows: Write an image encoded to PNG after being loaded as JPEG messes up the image HOT 5
- TestClipboardMultipleWrites only write text,no image. HOT 1
- The shortcut key Ctrl+C cannot be detected when copying images. HOT 4
- Remove cgo requirements on macOS HOT 2
- suggestion: making `Write` blocking instead of returning a channel HOT 30
- Add *BSD support
- Hangs / slow on Linux
- Don't panic when headless HOT 1
- Is `clipboard.Write(clipboard.FmtImage, []byte)` not design to copy any other format than `PNG`? HOT 1
- 可以做成像 electron 那样，同时写入多种内容么，例如同时写入 text 和 html
- Crashing on wayland
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