Getting path of file opened

Discussion in 'Mac Programming' started by Draque, Mar 13, 2015.

  1. Draque macrumors newbie

    Jan 6, 2015
    I'm using Objective C to develop a console app which I've packaged in a .app file. I need it to be able to run on a file when the file is drag/dropped over the app, or an associated file type is double clicked and opened with the app.

    In code, how can I access the full path of the file that's drag/dropped or double clicked? Any assistance would be really appreciated, as I feel like this should be something really basic that I'm missing.

  2. theSeb macrumors 604


    Aug 10, 2010
    Poole, England
  3. Draque thread starter macrumors newbie

    Jan 6, 2015
    I'm actually trying to modify a branch of JavaAppLauncher. Below is the full code. This branch already passes arguments to the app it is bundled in to the specified Java class, which is half of what I need. The remaining half is that when the app is handed a file to open, or the file is dropped on top of the .app file, it should be able to pass the full path of that file to the java program.

    If I can just figure out how to grab that string value, I can pass it in the same way that arguments are currently being passed in.

     * Copyright 2012, Oracle and/or its affiliates. All rights reserved.
     * Copyright 2013, D. R. Commander. All rights reserved.
     * This code is free software; you can redistribute it and/or modify it
     * under the terms of the GNU General Public License version 2 only, as
     * published by the Free Software Foundation.  Oracle designates this
     * particular file as subject to the "Classpath" exception as provided
     * by Oracle in the LICENSE file that accompanied this code.
     * This code is distributed in the hope that it will be useful, but WITHOUT
     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     * version 2 for more details (a copy is included in the LICENSE file that
     * accompanied this code).
     * You should have received a copy of the GNU General Public License version
     * 2 along with this work; if not, write to the Free Software Foundation,
     * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     * or visit if you need additional information or have any
     * questions.
    #import <Cocoa/Cocoa.h>
    #include <dlfcn.h>
    #include <JavaVM/jni.h>
    #define JAVA_LAUNCH_ERROR "JavaLaunchError"
    #define JVM_RUNTIME_KEY "JVMRuntime"
    #define JVM_MAIN_CLASS_NAME_KEY "JVMMainClassName"
    #define JVM_OPTIONS_KEY "JVMOptions"
    #define JVM_ARGUMENTS_KEY "JVMArguments"
    #define UNSPECIFIED_ERROR "An unknown error occurred."
    #define LIBJLI_DYLIB "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/jli/libjli.dylib"
    typedef int (JNICALL *JLI_Launch_t)(int argc, char ** argv,
                                        int jargc, const char** jargv,
                                        int appclassc, const char** appclassv,
                                        const char* fullversion,
                                        const char* dotversion,
                                        const char* pname,
                                        const char* lname,
                                        jboolean javaargs,
                                        jboolean cpwildcard,
                                        jboolean javaw,
                                        jint ergo);
    int launch(char *);
    char **jargv = NULL;
    int jargc = 0;
    bool firstTime = true;
    int main(int argc, char *argv[]) {
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
        int result;
        @try {
            // DRC: I have no idea why this program re-enters itself, but that's
            // why the "firstTime" check is necessary.
            if (argc > 1 && !jargv && firstTime) {
                jargv = &argv[1];
                jargc = argc - 1;
            firstTime = false;
            result = 0;
        } @catch (NSException *exception) {
            NSAlert *alert = [[NSAlert alloc] init];
            [alert setAlertStyle:NSCriticalAlertStyle];
            [alert setMessageText:[exception reason]];
            [alert runModal];
            result = 1;
        [pool drain];
        return result;
    int launch(char *commandName) {
        // Get the main bundle
        NSBundle *mainBundle = [NSBundle mainBundle];
        // Set the working directory to the user's home directory
        chdir([NSHomeDirectory() UTF8String]);
        // Get the main bundle's info dictionary
        NSDictionary *infoDictionary = [mainBundle infoDictionary];
        // Locate the JLI_Launch() function
        NSString *runtime = [infoDictionary objectForKey:@JVM_RUNTIME_KEY];
        const char *libjliPath = NULL;
        if (runtime != nil) {
            NSString *runtimePath = [[[NSBundle mainBundle] builtInPlugInsPath] stringByAppendingPathComponent:runtime];
            libjliPath = [[runtimePath stringByAppendingPathComponent:@"Contents/Home/jre/lib/jli/libjli.dylib"] fileSystemRepresentation];
        } else {
            libjliPath = LIBJLI_DYLIB;
        void *libJLI = dlopen(libjliPath, RTLD_LAZY);
        JLI_Launch_t jli_LaunchFxnPtr = NULL;
        if (libJLI != NULL) {
            jli_LaunchFxnPtr = dlsym(libJLI, "JLI_Launch");
        if (jli_LaunchFxnPtr == NULL) {
            [[NSException exceptionWithName:@JAVA_LAUNCH_ERROR
                                     reason:NSLocalizedString(@"JRELoadError", @UNSPECIFIED_ERROR)
                                   userInfo:nil] raise];
        // Get the main class name
        NSString *mainClassName = [infoDictionary objectForKey:@JVM_MAIN_CLASS_NAME_KEY];
        if (mainClassName == nil) {
            [[NSException exceptionWithName:@JAVA_LAUNCH_ERROR
                                     reason:NSLocalizedString(@"MainClassNameRequired", @UNSPECIFIED_ERROR)
                                   userInfo:nil] raise];
        // Set the class path
        NSString *mainBundlePath = [mainBundle bundlePath];
        NSString *javaPath = [mainBundlePath stringByAppendingString:@"/Contents/Resources/Java"];
        NSMutableString *classPath = [NSMutableString stringWithFormat:@"-Djava.class.path=%@/Classes", javaPath];
        NSFileManager *defaultFileManager = [NSFileManager defaultManager];
        NSArray *javaDirectoryContents = [defaultFileManager contentsOfDirectoryAtPath:javaPath error:nil];
        if (javaDirectoryContents == nil) {
            [[NSException exceptionWithName:@JAVA_LAUNCH_ERROR
                                     reason:NSLocalizedString(@"JavaDirectoryNotFound", @UNSPECIFIED_ERROR)
                                   userInfo:nil] raise];
        for (NSString *file in javaDirectoryContents) {
            if ([file hasSuffix:@".jar"]) {
                [classPath appendFormat:@":%@/%@", javaPath, file];
        // Set the library path
        NSString *libraryPath = [NSString stringWithFormat:@"-Djava.library.path=%@/Contents/Resources/TurboJPEG", mainBundlePath];
        // Get the VM options
        NSArray *options = [infoDictionary objectForKey:@JVM_OPTIONS_KEY];
        if (options == nil) {
            options = [NSArray array];
        // Get the application arguments
        NSArray *arguments = [infoDictionary objectForKey:@JVM_ARGUMENTS_KEY];
        if (arguments == nil) {
            arguments = [NSArray array];
        // Initialize the arguments to JLI_Launch()
        int argc = 1 + [options count] + 2 + [arguments count] + 1 + jargc;
        char *argv[argc];
        int i = 0;
        argv[i++] = commandName;
        argv[i++] = strdup([classPath UTF8String]);
        argv[i++] = strdup([libraryPath UTF8String]);
        for (NSString *option in options) {
            option = [option stringByReplacingOccurrencesOfString:@APP_ROOT_PREFIX withString:[mainBundle bundlePath]];
            argv[i++] = strdup([option UTF8String]);
        argv[i++] = strdup([mainClassName UTF8String]);
        for (NSString *argument in arguments) {
            argument = [argument stringByReplacingOccurrencesOfString:@APP_ROOT_PREFIX withString:[mainBundle bundlePath]];
            argv[i++] = strdup([argument UTF8String]);
        if (jargc > 0 && jargv) {
            int j;
            for (j = 0; j < jargc; j++) {
                if (!strncmp(jargv[j], "-psn", 4)) {
                argv[i++] = jargv[j];
        // Invoke JLI_Launch()
        return jli_LaunchFxnPtr(argc, argv,
                                0, NULL,
                                0, NULL,

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