spooler API研究——FindFirstPrinterChangeNotification和FindNextPrinterChangeNotification

女爷i 2022-07-14 14:39 310阅读 0赞

直接上代码：

需包含头文件

\#include "Windows.h"  
\#include <WinSpool.h>

\#pragma comment(lib, "Winspool.lib")

int FindChangeNotification()
    {
    	
    	HANDLE hPrinter;
    
      	PRINTER_DEFAULTS pDefault;
    	DEVMODE deMode;
    
        EnumDisplaySettings(m_pPrinters->pPrinterName,ENUM_CURRENT_SETTINGS,&deMode);
    
    	deMode.dmFields = DM_PAPERSIZE|DM_PAPERLENGTH|DM_PAPERWIDTH;
    	deMode.dmPaperSize=DMPAPER_A4;
    
    	pDefault.pDatatype=NULL;
    	pDefault.pDevMode=&deMode;
    	pDefault.DesiredAccess = PRINTER_ACCESS_ADMINISTER ;
    
    	
    	OpenPrinter(m_pPrinters->pPrinterName,&hPrinter,&pDefault);
    
        BYTE cbDataBuf[1024];
        memset(cbDataBuf,0,sizeof(cbDataBuf));
    
    	PRINTER_NOTIFY_OPTIONS pno;
    	pno.Version=2;
    	pno.Flags= PRINTER_NOTIFY_OPTIONS_REFRESH;
    	pno.Count=1;
    
    	PRINTER_NOTIFY_OPTIONS_TYPE pnotype;
    	pnotype.Type=JOB_NOTIFY_TYPE;
    	pnotype.Count=1;
    
    	unsigned short fields = JOB_NOTIFY_FIELD_NOTIFY_NAME;
    	pnotype.pFields=&fields;
    	pno.pTypes= &pnotype;
    
    	PRINTER_NOTIFY_INFO *pnInfo=NULL;
    	DWORD dwChange;
    
    	HANDLE hNotify;
    
    	//创建变化结构体
    	hNotify = FindFirstPrinterChangeNotification(hPrinter,PRINTER_CHANGE_ADD_JOB,0,&pno);
    
    	while(true)
    	{
    		WaitForSingleObject(hNotify,0xFFFFFFFF);
    
    		//捕捉打印请求
    		FindNextPrinterChangeNotification(hNotify,&dwChange,&pno,(void**)&pnInfo);
    
    	    DWORD dwNeed = 0;
    	    DWORD dwReturned=0;
    
    	    EnumJobs(hPrinter,0,10,2,NULL,0,&dwNeed,&dwReturned);
    	    BYTE * pdata = (BYTE*)malloc(dwNeed);
    	    memset(pdata,0,dwNeed);
    	    
    		EnumJobs(hPrinter,0,10,2,pdata,dwNeed,&dwNeed,&dwReturned);
    	    
    		JOB_INFO_2* pjob = (JOB_INFO_2*) pdata;
    	    DWORD dwJobID = pjob[dwReturned-1].JobId;
    
    	 
    	   SetJob(hPrinter,dwJobID,0,NULL,JOB_CONTROL_PAUSE);
    
    	
    	   free(pdata);
    	}
    	
    	Sleep(10);
    	
    	ClosePrinter(hPrinter);
    
    	return 0;
    
    }