windows 应用程序注册成服务以后获取默认打印机的问题
最近程序里面需要新增一个打印功能，由于程序需要注册成服务，在获取默认打印机的时候各种方法总是失败，GetProfileString返回2，GetDefaultPrinter好像是返回1081，发个帖，看看有没有大侠接触过的，指导下！！
ps：如果应用程序不注册成服务，直接双击运行，都是可以正常工作的，注册成服务以后就嗝屁了，感觉两种方式的主要区别就是服务没法和用户交互，但是这个获取默认打印机的东东应该不要交互把？！！！
[解决办法]
以下内容仅供参考：
用调试器(OD,WINDBG等)调试服务程序
To debug the initialization code of a service application, the debugger must be attached when the service is started. This is accomplished by creating a registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ProgramName
The ProgramName is the image file for the service application you are debugging. Do not specify a path. For example, the ProgramName might look like MyService.exe.
Under this key create a string data value called Debugger. The value of this string should be set to the full path of the debugger that will be used. For example,
c:\Debuggers\windbg.exe
In addition to setting this registry key, the service application must be marked as "interactive". This allows your service to interact with the desktop, and allows the debugger window to appear on your desktop.
This again requires modifying a registry key: you must bitwise-or the type entry for your service with 0x100 (this is the value for SERVICE_INTERACTIVE_PROCESS according to Winnt.h). The exact location and name of this registry entry varies. For example:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MyServiceKey
Finally, you need to adjust the service application timeout. Otherwise, the service application will kill the debugger within 20 seconds after starting. Adjusting the timeout involves setting an entry in the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
Under this key, create a DWORD data value called ServicesPipeTimeout. Set this entry to the amount of time in milliseconds that you want the service to wait before timing out. For example, 60,000 is one minute, while 86,400,000 is 24 hours.
设置ServicesPipeTimeout后需要重启系统才生效
Now, when the service is started, the debugger will also start. When the debugger starts, it will stop at the initial process breakpoint, before the service has begun running. This allows you to set breakpoints or otherwise configure your debugging session to let you monitor the startup of your service. Another option is to place calls to the DebugBreak function in your service from the point at which you would like to break into the debugger. (For more information, see DebugBreak in the Platform SDK documentation.)
If your service is running with other services in a Service Host Process, you may need to isolate the service into its own Service Host Process.
