spooler API研究——打印机任务截获和设置

梦里梦外; 2022-07-14 14:39 298阅读 0赞

直接上代码：

需包含头文件如下：

\#include "Windows.h"  
\#include <WinSpool.h>      
\#pragma comment(lib, "Winspool.lib")

void ShowPrinterStatus()
    {
         HANDLE printerHandle;                //打印机设备句柄
         PRINTER_INFO_2* pPrinterInfo = NULL;
    	 while(1)
    	 {
    
    		 //检测打开打印机设备是否成功
    		 if(!OpenPrinter(m_pPrinters->pPrinterName, &printerHandle, NULL))
    		 {
    			 return;
    		 }     
    	
    
    		 DWORD nByteNeeded;
    		 DWORD nReturned;
    		 DWORD nByteUsed;
         
    		 //通过调用GetPrinter()函数得到作业数量     
    		 GetPrinter(printerHandle, 2, NULL, 0, &nByteNeeded);
    		 pPrinterInfo = (PRINTER_INFO_2*)malloc(nByteNeeded);
    		 GetPrinter(printerHandle, 2, (LPBYTE)pPrinterInfo, nByteNeeded, &nByteUsed);
         
    	
    		 //通过调用EnumJobs()函数枚举打印任务
    		 JOB_INFO_2* pJobInfo = NULL;
    		 EnumJobs(printerHandle, 0, pPrinterInfo->cJobs, 2, NULL, 0, 
    			 (LPDWORD)&nByteNeeded, (LPDWORD)&nReturned);
    		 pJobInfo = (JOB_INFO_2*)malloc(nByteNeeded);
    		 ZeroMemory(pJobInfo, nByteNeeded);
    		 EnumJobs(printerHandle, 0, pPrinterInfo->cJobs, 2, (LPBYTE)pJobInfo, nByteNeeded, 
    			 (LPDWORD)&nByteUsed, (LPDWORD)&nReturned);
         
    		 //检测当前是否有打印任务
    		 if(pPrinterInfo->cJobs != 0)
    		 {
    			 
    			//打印第一个任务
    			printf("%d:%s\n",pJobInfo[0].JobId,pJobInfo[0].pDocument);
    			
    			//将第一个任务挂起
    			SetJob(printerHandle,pJobInfo[0].JobId,2,NULL,JOB_CONTROL_PAUSE);		
    
    		 }
    		
    		 
    		free(pPrinterInfo);
    		
    		//关闭打印机设备
    		ClosePrinter(printerHandle);
    
    		Sleep(10);
    
    	 }     
         
    }