electron.clipboard.readText() returns empty string

I try to use require('electron').clipboard.readText() and just get an empty string, although I have some text in the clipboard.

I see this in Console.app (not sure if this is related):

Failed to set up CFPasteboardRef 'Apple CFPasteboard general'. Error: <error: 0x7fffa6d6fda0> { count = 1, transaction: 0, voucher = 0x0, contents =

    "XPCErrorDescription" => <string: 0x7fffa6d70048> { length = 18, contents = "Connection invalid" }

}

How can I fix this?

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

add a comment |

I try to use require('electron').clipboard.readText() and just get an empty string, although I have some text in the clipboard.

I see this in Console.app (not sure if this is related):

Failed to set up CFPasteboardRef 'Apple CFPasteboard general'. Error: <error: 0x7fffa6d6fda0> { count = 1, transaction: 0, voucher = 0x0, contents =

    "XPCErrorDescription" => <string: 0x7fffa6d70048> { length = 18, contents = "Connection invalid" }

}

How can I fix this?

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

add a comment |

I try to use require('electron').clipboard.readText() and just get an empty string, although I have some text in the clipboard.

I see this in Console.app (not sure if this is related):

Failed to set up CFPasteboardRef 'Apple CFPasteboard general'. Error: <error: 0x7fffa6d6fda0> { count = 1, transaction: 0, voucher = 0x0, contents =

    "XPCErrorDescription" => <string: 0x7fffa6d70048> { length = 18, contents = "Connection invalid" }

}

How can I fix this?

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

I try to use require('electron').clipboard.readText() and just get an empty string, although I have some text in the clipboard.

I see this in Console.app (not sure if this is related):

Failed to set up CFPasteboardRef 'Apple CFPasteboard general'. Error: <error: 0x7fffa6d6fda0> { count = 1, transaction: 0, voucher = 0x0, contents =

    "XPCErrorDescription" => <string: 0x7fffa6d70048> { length = 18, contents = "Connection invalid" }

}

How can I fix this?

electron

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

asked Dec 28 '18 at 12:54

Albert

27.7k44171298

add a comment |

1 Answer
1

active

oldest

votes

I think this is because the Electron app was started via execve() in a forked process (fork() +daemon()` actually).

One workaround is to execute /usr/bin/open as a wrapper, like so (pseudo code):

open -a argv[0] --args args[1...]

Or basically this code:

char** args = parse_args(cmd);

char* arg0 = find_in_path(args[0]);

pid_t pid = fork();

if (pid == 0) {

    daemon(1, 0);

#ifdef __APPLE__

    {

        // We cannot directly use `execv` for a GUI app on MacOSX

        // in a forked process

        // (e.g. issues like https://stackoverflow.com/questions/53958926/).

        // But using `open` will work around this.

        int argc = 0;

        for(; args[argc]; ++argc);

        char** args_ext = malloc(sizeof(char*) * (argc + 5));

        arg0 = "/usr/bin/open";

        args_ext[0] = arg0;

        args_ext[1] = "-a";

        args_ext[2] = args[0];

        args_ext[3] = "--args";

        for(int i = 0; ; ++i) {

            args_ext[i + 4] = args[i + 1];

            if(!args[i + 1])

                break;

        }

        args = args_ext;

    }

#endif

    execv(arg0, args);

    exit(-1);

} else if (pid > 0) { // master

    // go on ...

    free(args);

} else {

    // error handling...

}

(Basically via this commit.)

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

add a comment |

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1 Answer
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active

oldest

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1 Answer
1

active

oldest

votes

I think this is because the Electron app was started via execve() in a forked process (fork() +daemon()` actually).

One workaround is to execute /usr/bin/open as a wrapper, like so (pseudo code):

open -a argv[0] --args args[1...]

Or basically this code:

char** args = parse_args(cmd);

char* arg0 = find_in_path(args[0]);

pid_t pid = fork();

if (pid == 0) {

    daemon(1, 0);

#ifdef __APPLE__

    {

        // We cannot directly use `execv` for a GUI app on MacOSX

        // in a forked process

        // (e.g. issues like https://stackoverflow.com/questions/53958926/).

        // But using `open` will work around this.

        int argc = 0;

        for(; args[argc]; ++argc);

        char** args_ext = malloc(sizeof(char*) * (argc + 5));

        arg0 = "/usr/bin/open";

        args_ext[0] = arg0;

        args_ext[1] = "-a";

        args_ext[2] = args[0];

        args_ext[3] = "--args";

        for(int i = 0; ; ++i) {

            args_ext[i + 4] = args[i + 1];

            if(!args[i + 1])

                break;

        }

        args = args_ext;

    }

#endif

    execv(arg0, args);

    exit(-1);

} else if (pid > 0) { // master

    // go on ...

    free(args);

} else {

    // error handling...

}

(Basically via this commit.)

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

add a comment |

I think this is because the Electron app was started via execve() in a forked process (fork() +daemon()` actually).

One workaround is to execute /usr/bin/open as a wrapper, like so (pseudo code):

open -a argv[0] --args args[1...]

Or basically this code:

char** args = parse_args(cmd);

char* arg0 = find_in_path(args[0]);

pid_t pid = fork();

if (pid == 0) {

    daemon(1, 0);

#ifdef __APPLE__

    {

        // We cannot directly use `execv` for a GUI app on MacOSX

        // in a forked process

        // (e.g. issues like https://stackoverflow.com/questions/53958926/).

        // But using `open` will work around this.

        int argc = 0;

        for(; args[argc]; ++argc);

        char** args_ext = malloc(sizeof(char*) * (argc + 5));

        arg0 = "/usr/bin/open";

        args_ext[0] = arg0;

        args_ext[1] = "-a";

        args_ext[2] = args[0];

        args_ext[3] = "--args";

        for(int i = 0; ; ++i) {

            args_ext[i + 4] = args[i + 1];

            if(!args[i + 1])

                break;

        }

        args = args_ext;

    }

#endif

    execv(arg0, args);

    exit(-1);

} else if (pid > 0) { // master

    // go on ...

    free(args);

} else {

    // error handling...

}

(Basically via this commit.)

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

add a comment |

I think this is because the Electron app was started via execve() in a forked process (fork() +daemon()` actually).

One workaround is to execute /usr/bin/open as a wrapper, like so (pseudo code):

open -a argv[0] --args args[1...]

Or basically this code:

char** args = parse_args(cmd);

char* arg0 = find_in_path(args[0]);

pid_t pid = fork();

if (pid == 0) {

    daemon(1, 0);

#ifdef __APPLE__

    {

        // We cannot directly use `execv` for a GUI app on MacOSX

        // in a forked process

        // (e.g. issues like https://stackoverflow.com/questions/53958926/).

        // But using `open` will work around this.

        int argc = 0;

        for(; args[argc]; ++argc);

        char** args_ext = malloc(sizeof(char*) * (argc + 5));

        arg0 = "/usr/bin/open";

        args_ext[0] = arg0;

        args_ext[1] = "-a";

        args_ext[2] = args[0];

        args_ext[3] = "--args";

        for(int i = 0; ; ++i) {

            args_ext[i + 4] = args[i + 1];

            if(!args[i + 1])

                break;

        }

        args = args_ext;

    }

#endif

    execv(arg0, args);

    exit(-1);

} else if (pid > 0) { // master

    // go on ...

    free(args);

} else {

    // error handling...

}

(Basically via this commit.)

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

I think this is because the Electron app was started via execve() in a forked process (fork() +daemon()` actually).

One workaround is to execute /usr/bin/open as a wrapper, like so (pseudo code):

open -a argv[0] --args args[1...]

Or basically this code:

char** args = parse_args(cmd);

char* arg0 = find_in_path(args[0]);

pid_t pid = fork();

if (pid == 0) {

    daemon(1, 0);

#ifdef __APPLE__

    {

        // We cannot directly use `execv` for a GUI app on MacOSX

        // in a forked process

        // (e.g. issues like https://stackoverflow.com/questions/53958926/).

        // But using `open` will work around this.

        int argc = 0;

        for(; args[argc]; ++argc);

        char** args_ext = malloc(sizeof(char*) * (argc + 5));

        arg0 = "/usr/bin/open";

        args_ext[0] = arg0;

        args_ext[1] = "-a";

        args_ext[2] = args[0];

        args_ext[3] = "--args";

        for(int i = 0; ; ++i) {

            args_ext[i + 4] = args[i + 1];

            if(!args[i + 1])

                break;

        }

        args = args_ext;

    }

#endif

    execv(arg0, args);

    exit(-1);

} else if (pid > 0) { // master

    // go on ...

    free(args);

} else {

    // error handling...

}

(Basically via this commit.)

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

edited Dec 28 '18 at 14:48

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

answered Dec 28 '18 at 13:50

Albert

27.7k44171298

add a comment |

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