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cocoa + dmg 文件 + 追溯其路径

转载 作者:行者123 更新时间:2023-12-03 16:53:24 28 4
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我遇到的情况是,我的 .dmg 文件将位于包含我的应用程序的可移动存储设备上。当我双击它时,它将安装在我的本地计算机上,并且安装的卷内将是我的 .app (应用程序文件)。现在,我希望我的应用程序在我的 dmg 文件安装到本地计算机上后自动启动。现在我的应用程序还需要有关实际 dmg 文件所在位置的信息,例如其在可移动存储设备上的路径。这是否可能,如果可以,我如何找到挂载该卷的 dmg 文件的路径。

谢谢

最佳答案

  1. 在 Mac OS X 中无法自动启动应用程序。存在一些安全原因。唯一可以自动启动的是 .pkg 文件,而且只能通过 Safari AFAIK。

  2. 可以确定应用程序所在的 DMG 文件。为此,您必须使用 IOKit。尝试使用 IORegistryExplorer。

一些可能对您有帮助的代码

这是我第一次尝试使用 IOKit,它是出于其他目的,但仍然应该有帮助。

// hopefully all needed headers
#include <sys/stat.h>

#include <IOKit/IOKitLib.h>
#include <IOKit/IOBSD.h>
#include <CoreFoundation/CoreFoundation.h>

/* First we want to get the major and minor BSD number
* of the DMG that our app is residing on.
*
* char *path is the path of a file that resides on the disk image.
* It is like this: /Volumes/Partition Name/SomeFile
* The simplest method to get such a path is to ask
* NSBundle for the path of the executable.
*/

// look up device number with stat
char *path = "path/to/app";

struct stat stats;
if (stat(path, &stats) != 0) {
return;
}
int bsd_major = major(stats.st_dev);
int bsd_minor = minor(stats.st_dev);

/* Now that we've got the BSD numbers we have to locate the
* IOService that has those numbers. IOKit works with
* CoreFoundation types.
*/

CFTypeRef keys[2] = { CFSTR(kIOBSDMajorKey), CFSTR(kIOBSDMinorKey) };
CFTypeRef values[2];
values[0] = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &bsd_major);
values[1] = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &bsd_minor);

CFDictionaryRef matchingDictionary;
matchingDictionary = CFDictionaryCreate(kCFAllocatorDefault,
&keys, &values,
sizeof(keys) / sizeof(*keys),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);

CFRelease(values[0]);
CFRelease(values[1]);
// IOServiceGetMatchingService uses up one reference to the dictionary
io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault,
matchingDictionary);

if (!service) {
return;
}

/* Now this part is quite different from what I need
* for my application. I'm not sure how this works
* because I'm currently not at my Mac and cannot try it.
*
* You need to go up the IOService chain. It looks like this:
+-o IOHDIXHDDriveOutKernelUserClient
+-o IODiskImageBlockStorageDeviceOutKernel <---- You want to get up here
+-o IOBlockStorageDriver
+-o Apple UDIF read-only compressed (zlib) Media
+-o IOMediaBSDClient
+-o IOApplePartitionScheme
+-o Apple@1
| +-o IOMediaBSDClient
+-o disk image@2 <---- This is the matched IOService!
+-o IOMediaBSDClient
*
* IODiskImage... has a property "Protocol Characteristics" which is a
* dictionary that has the key "Virtual Interface Location Path" which is
* the path to the disk image. There are probably #defines somewhere in
* IOKit for those keys.
*
* This code is NOT tested. It's out of my head and the documentation.
* This goes up 4 times in the hierarchy. Hopefully there aren't more
* than 1 parents.
*/

for (int i = 0; i < 4; i++) {
io_service_t parent;
IORegistryEntryGetParentEntry(service, kIOServicePlane, &parent);
IOObjectRelease(service);
service = parent;
}

/* Getting the property from the IOService is the last step:
*/

CFDictionaryRef characteristics;
characteristics = (CFDictionaryRef)IORegistryEntryCreateCFProperty(service,
CFSTR("Protocol Characteristics"),
kCFAllocatorDefault, 0)

CFStringRef *dmgPath = CFDictionaryGetValue(characteristics,
CFSTR("Virtual Interface Location Path"));
// clean up
IOObjectRelease(service);
CFRetain(dmgPath);
CFRelease(characteristics);

// Use the path

// later
CFRelease(dmgPath);

由于免费桥接支持,大部分工作都可以使用 Foundation 类而不是 CoreFoundation 类来完成。这使得它更容易、更易读。

<小时/>

如果 IOBlockStorageDriver 的父 IOService 是 IODiskImageBlockStorageDeviceOutKernel,则上面的示例代码可以正常工作。如果父 IOService 的名称是“AppleDiskImageDevice”,则 IOService 链看起来有点不同:

  +-o IOHDIXHDDriveOutKernelUserClient
+-o AppleDiskImageDevice <---- You want to get up here
+-o IOBlockStorageDriver
+-o Apple Disk Image Media <---- This is different
+-o IOMediaBSDClient
+-o IOApplePartitionScheme
+-o Apple@1
| +-o IOMediaBSDClient
+-o disk image@2 <---- This is the matched IOService!
+-o IOMediaBSDClient

在上面的for循环之后,您可以获取如下所示的图像文件路径URL字符串:

CFMutableDictionaryRef properties = nil;
IORegistryEntryCreateCFProperties(service, &properties, kCFAllocatorDefault, kNilOptions);
if (properties) {
CFStringRef url = CFDictionaryGetValue(properties, CFSTR("DiskImageURL"));
CFRelease(properties);
}
IOObjectRelease(service);

关于cocoa + dmg 文件 + 追溯其路径,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1785439/

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