Question

我需要在Mac OS上找出SystemUIServer进程的pid，以便将其交给AXUIElementCreateApplication（pid）;

在shell上很容易通过ps，但我怎么能用C / C ++或Objective-C做呢？

Answer 1

我会检查所有正在运行的进程。

pid_t resultPid = -1;
NSArray *runningApplications = [[NSWorkspace sharedWorkspace] runningApplications];
for (NSRunningApplication *app in runningApplications) {
    pid_t pid = [app processIdentifier];
    if (pid != ((pid_t)-1)) {
        AXUIElementRef appl = AXUIElementCreateApplication(pid);
        id result = nil;
        if(AXUIElementCopyAttributeValue(appl, (CFStringRef)NSAccessibilityTitleAttribute, (void *)&result) == kAXErrorSuccess) {
            if([((NSString*)result) isEqualToString:@"SystemUIServer"]){
                resultPid = pid;
                break;
            }      
        }
    }
}

您还可以使用UIElementUtilities by Apple（它有助于管理AXUIElementRef实例）来获取进程的名称。

Answer 2

感谢Sudo，Yahoo和Google，我找到了以下解决方案：

#include <libproc.h>

int getPid(const char* processname)
{
  pid_t resultPid = -1;
  NSArray *runningApplications = [[NSWorkspace sharedWorkspace] runningApplications];

  for (NSRunningApplication *app in runningApplications) {
    pid_t pid = [app processIdentifier];
    if (pid != ((pid_t)-1)) {

      char nameBuffer[512];
      proc_name(pid, nameBuffer, sizeof(nameBuffer));

      if(!strcmp(processname,nameBuffer)) {
         resultPid=pid;
         break;
      }
    }
  }

  return resultPid;
}

如何在Mac OS上的C / C ++ / Objective-C中找到SystemUIServer进程的PID？

2 个答案: