我的代码中有错误。我的打印机名称是" XP-58"不会从C ++程序打印文本。 但是当我从notepat运行打印时,它会正确地工作。 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;
}
我在这里使用函数https://msdn.microsoft.com/en-us/library/windows/desktop/dd162959(v=vs.85).aspx
正如你所看到的,我在节目结束后得到了结果&#34; std :: cout&lt;&lt;结果&lt;&lt;的std :: ENDL;&#34;结果总是显示&#34; 1&#34;。
问题是什么? 可能是我需要为打印机设置指定端口?我的打印机连接到USB002端口。 当我从记事本开始打印时,我在&#34;打印队列管理器&#34;中看到了这个端口,但是当从我的程序中添加任务时,我看不到管理器中的任何端口。 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);
}
答案 0 :(得分:2)
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,您需要将字符"\r\n"
添加到字符串中。
完成页面后,将"\f"
添加到字符串中。