[英]C++ printer don't want to print
我的代码有错误。 我的打印机名为“ XP-58”,无法从C ++程序打印文本。 但是,当我从notepat运行打印时,它可以正常工作。 我的C ++代码
int _tmain(int argc, _TCHAR* argv[])
{
LPTSTR printerName = (LPTSTR)_T("XP-58");
CString str = "la-la-la";
LPBYTE pByte = new BYTE[str.GetLength() + 1];
memcpy(pByte, (VOID*)LPCTSTR(str), str.GetLength());
DWORD count = 7;
BOOL result = RawDataToPrinter(printerName, pByte, count);
std::cout << result << std::endl;
system("pause");
return 0;
}
我从这里使用功能https://msdn.microsoft.com/en-us/library/windows/desktop/dd162959(v=vs.85).aspx
如您所见,程序结束后我得到结果“ std :: cout <<结果<< std :: endl;” 结果始终显示为“ 1”。
这是什么问题? 我可能需要设置打印机的指定端口吗? 我的打印机连接到USB002端口。 从记事本开始打印时,我在“打印队列管理器”中看到此端口,但是从程序中添加任务后,在管理器中看不到任何端口。 请帮忙)
完整代码
#include "stdafx.h"
#include <Windows.h>
#include <Winspool.h>
#include <CommDlg.h>
#include <math.h>
#include <atlstr.h>
#include <iostream>
BOOL RawDataToPrinter(LPTSTR szPrinterName, LPBYTE lpData, DWORD dwCount)
{
BOOL bStatus = FALSE;
HANDLE hPrinter = NULL;
DOC_INFO_1 DocInfo;
DWORD dwJob = 0L;
DWORD dwBytesWritten = 0L;
// Open a handle to the printer.
bStatus = OpenPrinter( szPrinterName, &hPrinter, NULL );
if (bStatus) {
// Fill in the structure with info about this "document."
DocInfo.pDocName = (LPTSTR)_T("chargebox barcode check");
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = (LPTSTR)_T("RAW");
// Inform the spooler the document is beginning.
dwJob = StartDocPrinter( hPrinter, 1, (LPBYTE)&DocInfo );
if (dwJob > 0) {
// Start a page.
bStatus = StartPagePrinter( hPrinter );
if (bStatus) {
// Send the data to the printer.
bStatus = WritePrinter( hPrinter, lpData, dwCount, &dwBytesWritten);
EndPagePrinter (hPrinter);
}
// Inform the spooler that the document is ending.
EndDocPrinter( hPrinter );
}
// Close the printer handle.
ClosePrinter( hPrinter );
}
// Check to see if correct number of bytes were written.
if (!bStatus || (dwBytesWritten != dwCount)) {
bStatus = FALSE;
} else {
bStatus = TRUE;
}
return bStatus;
}
int _tmain(int argc, _TCHAR* argv[])
{
LPTSTR printerName = (LPTSTR)_T("XP-58");
CStringW str = L"unicode";
int bytelen = 2 * str.GetLength();
LPBYTE pByte = new BYTE[bytelen];
memcpy(pByte, str, bytelen);
DWORD count = bytelen;
BOOL result = RawDataToPrinter(printerName, pByte, count);
std::cout << GetLastError() << std::endl;
std::cout << result << std::endl;
system("pause");
return(0);
}
打印机不知道您已完成所有内容的发送,因此无法打印。
要完成一行,您需要在字符串中添加字符"\\r\\n"
。
完成页面后,在字符串中添加"\\f"
。
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