vova616 / screenshot Goto Github PK

I am getting the following exception while taking a screenshot on Ubuntu.

XGB: conn.go:47: Could not get authority info: open /var/go/.Xauthority: no such file or directory
XGB: conn.go:48: Trying connection without authority info...
XGB: conn.go:47: Could not get authority info: open /var/go/.Xauthority: no such file or directory
XGB: conn.go:48: Trying connection without authority info...
panic: runtime error: index out of range

goroutine 1 [running]:
panic(0x556a40, 0xc420014130)
	/usr/local/Cellar/go/1.7.4/libexec/src/runtime/panic.go:500 +0x1a1
image.(*RGBA).Opaque(0xc42065c000, 0x62e340)
	/usr/local/Cellar/go/1.7.4/libexec/src/image/image.go:141 +0xc3
image/png.opaque(0x62e340, 0xc42065c000, 0x62c240)
	/usr/local/Cellar/go/1.7.4/libexec/src/image/png/writer.go:60 +0x162
image/png.(*Encoder).Encode(0xc4200e6010, 0x62c5c0, 0xc420054000, 0x62e340, 0xc42065c000, 0x0, 0x0)
	/usr/local/Cellar/go/1.7.4/libexec/src/image/png/writer.go:508 +0x505
image/png.Encode(0x62c5c0, 0xc420054000, 0x62e340, 0xc42065c000, 0x0, 0x0)
	/usr/local/Cellar/go/1.7.4/libexec/src/image/png/writer.go:476 +0x6a
main.main()
	/Users/kashishm/Documents/go/src/github.com/sample/example/main.go:42 +0x155

code(from example folder)

func main() {
	img, err := screenshot.CaptureScreen()
	if err != nil {
		panic(err)
	}
	f, err := os.Create("./ss.png")
	if err != nil {
		panic(err)
	}
	err = png.Encode(f, img)
	if err != nil {
		panic(err)
	}
	f.Close()
}

Receive the following:
ERROR x protocol authentication refused: Maximum number of clients reached

continuously from

img, err := screenshot.CaptureScreen()

after running for several hundred iterations.

I have a feeling this is an upstream error as your code seems to close the xgb handle that you create.

I'll try and make a minimal testcase.

If I suppose I have a window descriptor for the application I need, how can I do this?

for {
screenshot.CaptureScreen()
}

I attempted to use this library on my Windows 8.1 laptop and, first, had to change these lines to use uint32, int32 and int32, respectively, in order to get the code to compile.

After that, using https://github.com/AllenDang/w32 caused some runtime fatal errors. I went and found a more up-to-date branch, and found that the fork https://github.com/fromkeith/w32 fixed the fatal errors I was having.

Anyway, this isn't really an issue, but I figured I'd let the author of this library know.

Screenshot (using example program) works fine with I have scaling at 100%. But if I change scaling (say 125% or 150%), screenshot doesn't capture entire screen

After taking a lot of screenshots on Linux, I get the following error:

x protocol authentication refused: Maximum number of clients reachedError

Am I supposed to call something after I take a screenshot.

I also get those logs whenever I take a screenshot:

XGB: conn.go:47: Could not get authority info: EOF
XGB: conn.go:48: Trying connection without authority info...

I couldn't find a way to make this work on mac without using cgo, I will keep searching but the current way is not working at all.

what kind of fps can I expect on a relatively decent mac?

github.com/vova616/screenshot/screenshot_darwin.go:49: cannot use rawData (type C.CFDataRef) as type C.CFTypeRef in argument to func literal

This is the error that is returned:
BadMatch {NiceName: Match, Sequence: 1, BadValue: 569, MinorOpcode: 0, MajorOpcode: 73}

I could imagine that it simply will not work on Wayland but in that case the error message is confusing.

For example: I have screen 1 and screen 2, how can I take a screenshot of 1 or 2?

It is working fine with one display screen but gives a merged screenshot of multiple displays on mac.

I have experienced a panic in BitBlt. This is hardly necessary to trigger panics in your package, when you could just return an error.

panic: BitBlt failed

goroutine 12 [running]:
myproject/vendor/github.com/vova616/screenshot.BitBlt(0xffffffff920134ee, 0x0, 0x0, 0x31c, 0x4c, 0xffffffff90011059, 0xbe4, 0x824, 0xcc0020)
myproject/vendor/github.com/vova616/screenshot/screenshot_windows.go:140 +0xed
myproject/vendor/github.com/vova616/screenshot.CaptureRect(0xbe4, 0x824, 0xf00, 0x870, 0x0, 0x0, 0x0)
myproject/sectionGuard/vendor/github.com/vova616/screenshot/screenshot_windows.go:74 +0x310
main.GetTraybarBackground(0xc04224cf50, 0xc04234b301, 0x0, 0x0)
myproject/main.go:30 +0xfe