GetPixelColor panic runtime: unknown pc 0x692561 when switch rdp

[502647092]

• Robotgo version (or commit ref): v0.93.1
• Go version: go version go1.13.4 windows/amd64
• Gcc version: gcc version 8.1.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project)
• Operating system and bit: Windows10 1909(18363.476)
• Resolution:
• Can you reproduce the bug at Examples:
  • Yes (provide example code)
  • No
  • Not relevant
• Provide example code:

func checkPoint(rect *win.RECT, x, y int, color string) bool {
	pointColor := robotgo.GetPixelColor(int(rect.Left)+x, int(rect.Top)+y)
	log.Printf("checkPoint X: %v Y:%v check: %v color: %v", x, y, color, pointColor)
	return strings.Contains(pointColor, color)
}

• Log gist:

Description

program run on remote desktop
when switch to remote window program will panic

Exception 0xc0000005 0x0 0x8 0x692561
PC=0x692561

runtime: unknown pc 0x692561
stack: frame={sp:0x3a6fdd0, fp:0x0} stack=[0x0,0x3a6feb0)
0000000003a6fcd0:  0000000000000000  0000000000000000
0000000003a6fce0:  000005c0fffffb30  000004d0fffffb30
0000000003a6fcf0:  00000000000000f0  0000000000000000
0000000003a6fd00:  00000000c0000005  0000000000000000
0000000003a6fd10:  0000000000692561  0000000000000002
0000000003a6fd20:  0000000000000000  0000000000000008
0000000003a6fd30:  0000000000000000  0000000000000000
0000000003a6fd40:  0000000000000000  0000000000000000
0000000003a6fd50:  0000000000000000  0000000000000000
0000000003a6fd60:  0000000000000000  0000000000000000
0000000003a6fd70:  0000000000000000  0000000000000000
0000000003a6fd80:  0000000000000000  0000000000000000
0000000003a6fd90:  0000000000000000  0000027700000000
0000000003a6fda0:  0000000000692561  ffffffffffffffff
0000000003a6fdb0:  0000000000000002  0000000003a6fdd0
0000000003a6fdc0:  0000000000000033  0000000000692561
0000000003a6fdd0: <000000000040bda0 <runtime.notewakeup+96>  000000c00003ea80
0000000003a6fde0:  00000000006ce0c8  0000000003a6fe10
0000000003a6fdf0:  0000027700000339  0000000100000001
0000000003a6fe00:  000000c000047e38  000000c000052000
0000000003a6fe10:  000000c000048000  000000000069888c
0000000003a6fe20:  000000c000052780  000000c000052701
0000000003a6fe30:  000000c000052701  0001000003a6fe01
0000000003a6fe40:  000000c000047e38  000000c000052000
0000000003a6fe50:  000000c000047e38  000000000045c113 <runtime.asmcgocall+115>
0000000003a6fe60:  0000000003a6fe90  00000000004398f2 <runtime.park_m+178>
0000000003a6fe70:  000000c000034f00  00000000009d1840
0000000003a6fe80:  0000000000000001  0000000000000238
0000000003a6fe90:  000000c000052780  000000000045a83e <runtime.mcall+94>
0000000003a6fea0:  000000c000034f00  0000000001575ad0
runtime: unknown pc 0x692561
stack: frame={sp:0x3a6fdd0, fp:0x0} stack=[0x0,0x3a6feb0)
0000000003a6fcd0:  0000000000000000  0000000000000000
0000000003a6fce0:  000005c0fffffb30  000004d0fffffb30
0000000003a6fcf0:  00000000000000f0  0000000000000000
0000000003a6fd00:  00000000c0000005  0000000000000000
0000000003a6fd10:  0000000000692561  0000000000000002
0000000003a6fd20:  0000000000000000  0000000000000008
0000000003a6fd30:  0000000000000000  0000000000000000
0000000003a6fd40:  0000000000000000  0000000000000000
0000000003a6fd50:  0000000000000000  0000000000000000
0000000003a6fd60:  0000000000000000  0000000000000000
0000000003a6fd70:  0000000000000000  0000000000000000
0000000003a6fd80:  0000000000000000  0000000000000000
0000000003a6fd90:  0000000000000000  0000027700000000
0000000003a6fda0:  0000000000692561  ffffffffffffffff
0000000003a6fdb0:  0000000000000002  0000000003a6fdd0
0000000003a6fdc0:  0000000000000033  0000000000692561
0000000003a6fdd0: <000000000040bda0 <runtime.notewakeup+96>  000000c00003ea80
0000000003a6fde0:  00000000006ce0c8  0000000003a6fe10
0000000003a6fdf0:  0000027700000339  0000000100000001
0000000003a6fe00:  000000c000047e38  000000c000052000
0000000003a6fe10:  000000c000048000  000000000069888c
0000000003a6fe20:  000000c000052780  000000c000052701
0000000003a6fe30:  000000c000052701  0001000003a6fe01
0000000003a6fe40:  000000c000047e38  000000c000052000
0000000003a6fe50:  000000c000047e38  000000000045c113 <runtime.asmcgocall+115>
0000000003a6fe60:  0000000003a6fe90  00000000004398f2 <runtime.park_m+178>
0000000003a6fe70:  000000c000034f00  00000000009d1840
0000000003a6fe80:  0000000000000001  0000000000000238
0000000003a6fe90:  000000c000052780  000000000045a83e <runtime.mcall+94>
0000000003a6fea0:  000000c000034f00  0000000001575ad0

goroutine 20 [syscall]:
github.com/go-vgo/robotgo._Cfunc_get_pixel_color(0x27700000339, 0x0)
        _cgo_gotypes.go:668 +0x55
github.com/go-vgo/robotgo.GetPixelColor(0x339, 0x277, 0x1, 0x0)
        C:/Users/MiaoWoo/go/pkg/mod/github.com/go-vgo/robotgo@v0.93.1/robotgo.go
:199 +0x3a

[nk9200014]

I have the same problem when using robotgo.FindBitmap(bitmap, nil, 0.1)
but robotgo.FindBitmap(bitmap) can work normally

[nk9200014]

I know where my problem is !
When I use robotgo.FindBitmap(bitmap, nil, 0.1) ,my app will crash after few minutes.
https://github.com/go-vgo/robotgo/blob/master/robotgo.go#L980
I found if the arg is not zero,the sbit will not FreeBitmap().
So I add a condition to it.
In robotgo.go
Before

if len(args) <= 0 {
	FreeBitmap(sbit)
}

After

if len(args) <= 0 {
	FreeBitmap(sbit)
} else if len(args) > 0 && args[0] == nil {
	FreeBitmap(sbit)
}

And the crash never happen again.

[vcaesar]

@nk9200014 Thx, and I fixed this.