我正在尝试在我的 Cocoa 项目中使用一些 Apple 事件来访问终端应用程序。我不想使用嵌入式 AppleScript 或任何已编译的脚本,因此我开始研究 NSAppleEventDescriptor
。
我已经成功使用do script
命令创建了一个新窗口,并且我已经成功从返回值中获取了该窗口。我现在唯一想做的就是获取该窗口的属性。
我现在知道如何获得这样的属性(property),所以我开始谷歌搜索。不幸的是,没有很多关于如何使用 Apple Events 的好例子,而且我没能找到我想要的东西。
所以我开始更深入地挖掘。我做的第一件事就是在终端 .sdef
文件中查找 get
命令的代码。我找不到它,所以我在 /System/
目录上执行了 grep
,然后找到了 /System/Library/Frameworks/AppleScriptKit.framework/Versions/A/Resources/AppleScriptKit.sdef
。我显然找到了 AppleScript 语法的核心。该文件确实具有 getd
四字符代码。
现在我知道我必须使用核心套件中的 getd
事件。然而,该 get-command 的参数是一个 objectSpecifier
。我到处搜索了一个使用 kAEGetData 的示例。但我没能找到任何可以让我学到东西的代码。
所以我在这里问:如何构建这样一个objectSpecifier
描述符?
这是我已经得到的:
创建和获取选项卡描述符的代码
NSAppleEventDescriptor *createEvent;
NSAppleEventDescriptor *scriptParam;
AppleEvent aeReply;
OSErr err;
/* Make the do script event */
createEvent = [NSAppleEventDescriptor
appleEventWithEventClass:kAECoreSuite
eventID:kAEDoScript
targetDescriptor:_applicationDescriptor
returnID:kAutoGenerateReturnID
transactionID:kAnyTransactionID];
if(createEvent == nil) {
NSLog(@"%s Failed to create a do script event",
__PRETTY_FUNCTION__);
return nil;
}
/* Make script parameter */
scriptParam = [NSAppleEventDescriptor descriptorWithString:@"echo Hello World"];
if(scriptParam == nil) {
NSLog(@"%s Failed to create the script parameter",
__PRETTY_FUNCTION__);
return nil;
}
/* Set parameter */
[createEvent setParamDescriptor:scriptParam forKeyword:keyDirectObject];
/* Send event */
err = AESendMessage([createEvent aeDesc], &aeReply,
kAEWaitReply | kAENeverInteract, kAEDefaultTimeout);
if(err != noErr) {
NSLog(@"%s Failed to send the create command",
__PRETTY_FUNCTION__);
return nil;
}
/* Retrieve information */
{
/* SEE BELOW TO SEE HOW I GET THE WINDOW DESCRIPTOR */
}
现在我尝试并成功获取该选项卡的窗口
// NSAppleEventDescriptor *ansr is set to the result of the code above
NSAppleEventDescriptor *mainObj;
NSAppleEventDescriptor *desiredClass;
NSAppleEventDescriptor *window;
mainObj = [ansr paramDescriptorForKeyword:keyDirectObject];
if([mainObj descriptorType] != typeObjectSpecifier) {
NSLog(@"%s Main object was not an object specifier",
__PRETTY_FUNCTION__);
return nil;
}
desiredClass = [mainObj paramDescriptorForKeyword:keyAEDesiredClass];
if([desiredClass typeCodeValue] != kAETerminalTab) {
NSLog(@"%s Main object's desired class was not a Terminal tab",
__PRETTY_FUNCTION__);
return nil;
}
window = [mainObj paramDescriptorForKeyword:keyAEContainer];
if(window == nil) {
NSLog(@"%s Couldn't get container of the tab",
__PRETTY_FUNCTION__);
return nil;
}
desiredClass = [window paramDescriptorForKeyword:keyAEDesiredClass];
if([desiredClass typeCodeValue] != cWindow) {
NSLog(@"%s The container of the tab was not a window",
__PRETTY_FUNCTION__);
return nil;
}
return window;
现在我无法获取边界属性
// _windowDescriptor is the result of the code above
NSAppleEventDescriptor *getEvent;
NSAppleEventDescriptor *prop;
AppleEvent aeReply;
NSAppleEventDescriptor *reply;
FourCharCode propName;
OSErr err;
propName = keyAEBounds;
/* Create get event */
getEvent = [NSAppleEventDescriptor
appleEventWithEventClass:kAECoreSuite
eventID:kAEGetData
targetDescriptor:_windowDescriptor
returnID:kAutoGenerateReturnID
transactionID:kAnyTransactionID];
if(getEvent == nil) {
NSLog(@"%s Failed to create a get event",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
/* Get property */
prop = [NSAppleEventDescriptor
descriptorWithDescriptorType:typeProperty
bytes:&propName length:sizeof(propName)];
if(prop == nil) {
NSLog(@"%s Failed to create the bounds property",
__PRETTY_FUNCTION__);
return;
}
/* Set parameter */
[getEvent setParamDescriptor:prop forKeyword:keyDirectObject];
/* Exectue */
err = AESendMessage([getEvent aeDesc], &aeReply,
kAEWaitReply | kAENeverInteract, kAEDefaultTimeout);
if(err != noErr) {
NSLog(@"%s Failed to send the get message",
__PRETTY_FUNCTION__);
return;
}
reply = [[NSAppleEventDescriptor alloc] initWithAEDescNoCopy:&aeReply];
[reply autorelease];
NSLog(@"Bounds: %@", reply);
正如所解释的,上面的代码有效,直到最后一个 block 。
预先感谢您的帮助。
最佳答案
感谢 Rob Keniger,我已经成功实现了我想要的目标。
显然我必须创建一个记录描述符,设置我想要的属性,然后强制它到typeObjectSpecifier
。
此外,我将窗口描述符设置为 Apple 事件的接收器是错误的。您始终必须解决应用程序本身的问题,并将直接对象的 from
(keyAEContainer
) 属性设置为您想要的窗口。
这是工作代码,其中包含一些 NSLog
语句:
- (NSRect)bounds {
// ! ! !
// _windowDescriptor is an instance variable which points to a valid
// window NSAppleEventDescriptor
// ! ! !
NSAppleEventDescriptor *getEvent;
NSAppleEventDescriptor *objSpec;
NSAppleEventDescriptor *propEnum, *propType, *propSeld;
AppleEvent aeReply;
NSAppleEventDescriptor *reply;
FourCharCode propName;
OSErr err;
propName = keyAEBounds;
/* Create get event */
getEvent = [NSAppleEventDescriptor
appleEventWithEventClass:kAECoreSuite
eventID:kAEGetData
targetDescriptor:[[FTMTerminalApp sharedApp] AEDescriptor]
returnID:kAutoGenerateReturnID
transactionID:kAnyTransactionID];
if(getEvent == nil) {
NSLog(@"%s Failed to create a get event",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
/* Get property */
/* create object specifier main ojcect */
objSpec = [[[NSAppleEventDescriptor alloc] initRecordDescriptor]
autorelease];
if(objSpec == nil) {
NSLog(@"%s Failed to create the object specifier",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
NSLog(@"%s Created object specifier %@",
__PRETTY_FUNCTION__, objSpec);
/* create property enum, we want a property */
propEnum = [NSAppleEventDescriptor
descriptorWithEnumCode:formPropertyID];
if(propEnum == nil) {
NSLog(@"%s Failed to create the property enum",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
NSLog(@"%s Created property enum %@",
__PRETTY_FUNCTION__, propEnum);
[objSpec setDescriptor:propEnum forKeyword:keyAEKeyForm];
/* create prop type */
propType = [NSAppleEventDescriptor
descriptorWithTypeCode:typeProperty];
if(propType == nil) {
NSLog(@"%s Failed to create the property type",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
NSLog(@"%s Created property type %@",
__PRETTY_FUNCTION__, propType);
[objSpec setDescriptor:propType forKeyword:keyAEDesiredClass];
/* create property key data */
propSeld = [NSAppleEventDescriptor
descriptorWithTypeCode:keyAEBounds];
if(propSeld == nil) {
NSLog(@"%s Failed to create the bounds property type",
__PRETTY_FUNCTION__);
return NSZeroRect;
}
NSLog(@"%s Created property key data %@",
__PRETTY_FUNCTION__, propSeld);
[objSpec setDescriptor:propSeld forKeyword:keyAEKeyData];
/* Set destination */
NSLog(@"%s Setting from key %@",
__PRETTY_FUNCTION__, _windowDescriptor);
[objSpec setDescriptor:_windowDescriptor forKeyword:keyAEContainer];
/* Send message */
objSpec = [objSpec coerceToDescriptorType:typeObjectSpecifier];
NSLog(@"Coerced: %@", objSpec);
[getEvent setParamDescriptor:objSpec forKeyword:keyDirectObject];
err = AESendMessage([getEvent aeDesc], &aeReply,
kAEWaitReply | kAENeverInteract, kAEDefaultTimeout);
if(err != noErr) {
NSLog(@"%s Failed to send the message (event = %@)",
__PRETTY_FUNCTION__, getEvent);
return NSZeroRect;
}
reply = [[NSAppleEventDescriptor alloc] initWithAEDescNoCopy:&aeReply];
NSLog(@"BOUNDS = %@", reply);
[reply autorelease];
return NSZeroRect;
}
我希望这会对某人有所帮助。
关于cocoa - 获取 NSAppleEventDescriptor 的 AppleScript 属性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9762205/