有关使用窗口API的问题 [英] A question about using window API

问题描述

为什么无法打开添加的打印机"A"?

 #include   ><   windows.h  > 
 #include   <   winspool.h  > 

 int  WINAPI WinMain(HINSTANCE hInstance，HINSTANCE hPrevInstance，
    LPSTR lpCmdLine， int  nCmdShow)
{
HANDLE hprinter =  0 ;
DEVMODE DevMode = { 0 };
PRINTER_DEFAULTS printerDe = { 0 ，& DevMode，PRINTER_ACCESS_USE};
LPSTR printer_name [ 5 ];
printer_name [ 0 ] = "  ;
PRINTER_INFO_2 pPrinter;
pPrinter.pPrinterName = " ;
pPrinter.pPortName = " ;
pPrinter.pDriverName = " ;
pPrinter.pPrintProcessor = " ;
pPrinter.pServerName = NULL;
pPrinter.pShareName = NULL;
pPrinter.pComment = NULL;
pPrinter.pLocation = NULL;
pPrinter.pDevMode = NULL;
pPrinter.pSepFile = NULL;
pPrinter.pDatatype = NULL;
pPrinter.pParameters = NULL;

LPPRINTER_INFO_2 pPrinter2 =& pPrinter;
hprinter = AddPrinter(NULL， 2 ，(LPBYTE)pPrinter2);
INT i =  0 ;
如果(！OpenPrinter(printer_name [i]，& hprinter，& printerDe))
{
MessageBox(NULL，" ，" 打开"，MB_OK)；
}
</winspool.h></windows.h> 

解决方案

if(!OpenPrinter(printer_name[i],&hprinter,&printerDe))

为什么使用下标([i])引用字符串?在尝试实现诸如此类的更高级的API调用之前，您最好花一些时间使用C/C ++的语言基础知识(指针，数组，函数，循环等).

Why the added printer "A" cannot be opened?

#include <windows.h>
#include <winspool.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow)
{
	HANDLE hprinter=0;
	DEVMODE DevMode={0};
	PRINTER_DEFAULTS printerDe={0,&DevMode,PRINTER_ACCESS_USE};
	LPSTR printer_name[5];
	printer_name[0]="A";
	PRINTER_INFO_2 pPrinter;
	pPrinter.pPrinterName="A"; 
	pPrinter.pPortName="LPT1:";			
	pPrinter.pDriverName="B";
	pPrinter.pPrintProcessor="C";
	pPrinter.pServerName=NULL;
	pPrinter.pShareName=NULL;
	pPrinter.pComment=NULL;
	pPrinter.pLocation=NULL;
	pPrinter.pDevMode=NULL;
	pPrinter.pSepFile=NULL;
	pPrinter.pDatatype=NULL;
	pPrinter.pParameters=NULL;
	
	LPPRINTER_INFO_2 pPrinter2=&pPrinter;
	hprinter=AddPrinter(NULL,2,(LPBYTE)pPrinter2);
	INT i=0;
	if(!OpenPrinter(printer_name[i],&hprinter,&printerDe))
	{
		MessageBox(NULL,"Fail Open","open",MB_OK);
	}
</winspool.h></windows.h>

解决方案

if(!OpenPrinter(printer_name[i],&hprinter,&printerDe))

Why are you using a subscript ([i]) to reference a string? You would be better spending some more time with the language basics of C/C++ (pointers, arrays, functions, loops, etc) before trying to implement a more advanced API call such as this.

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