[英]Windows GDI Printer error StartDocPrinter
實際上我正在使用Qt打印,需要將RAW命令(ESCP命令)發送到打印機。 經過一些搜索,我發現我需要使用Windows API來完成它。
請參閱此主題: win32-c-print-string-to-printer
我創建了如下代碼:
const QString pName = "EPSON LX-300+ /II";
LPBYTE lpData;
BOOL bStatus = FALSE;
HANDLE hPrinter = NULL;
DOC_INFO_1 DocInfo;
DWORD dwPrtJob = 0L;
DWORD dwBytesWritten = 0L;
LPTSTR printerName = new wchar_t[pName.length() + 1];
pName.toWCharArray(printerName);
printerName[pName.length()] = '\0';
QString so = "\x1b@Is it works?";
QByteArray ba = so.toUtf8();
lpData = (unsigned char*)(ba.data());
DWORD dwCount = ba.length();
qDebug() << so;
bStatus = OpenPrinter(printerName, &hPrinter, NULL);
if(bStatus) {
DocInfo.pDocName = (LPTSTR)_T("My Document");
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = (LPTSTR)_T("RAW");
dwPrtJob = StartDocPrinter (
hPrinter,
1,
(LPBYTE)&DocInfo);
qDebug() << GetLastError();
if (dwPrtJob > 0) {
qDebug() << "COMMAND";
// Send the data to the printer.
bStatus = WritePrinter (
hPrinter,
lpData,
dwCount,
&dwBytesWritten);
}
qDebug() << dwCount;
qDebug() << dwBytesWritten;
EndDocPrinter (hPrinter);
// Close the printer handle.
bStatus = ClosePrinter(hPrinter);
qDebug() << bStatus;
}
if (!bStatus || (dwCount != dwBytesWritten)) {
bStatus = FALSE;
} else {
bStatus = TRUE;
}
delete printerName;
並且代碼在StartDocPrinter上失敗,它返回0表示失敗。 並使用GetLastError(),函數返回1804.並參考此 ,錯誤是ERROR_INVALID_DATATYPE。 我不確定它是什么錯誤。 我嘗試使用不同的DocInfo.pDatatype來“RAW”,“TEXT”和“XPS_PASS”,結果是一樣的。
我有什么辦法可以解決它嗎?
DOC_INFO_1 DocInfo;
DocInfo.pDocName = (LPTSTR)_T("My Document");
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = (LPTSTR)_T("RAW");
這個演員歸結為
DocInfo.pDocName = (wchar_t*)L"My Document";
...
其中pDocName
被聲明為wchar_t*
這是錯誤的,並且pDocName
只是隱藏錯誤和警告。 盡量避免使用Microsoft T
宏,這些宏已經過時且無用。 請改用C ++ char
和wchar_t*
。 要在Windows中聲明UTF16寬字符串,請使用L
前綴。 正確用法如下:
DOC_INFO_1 DocInfo;
wchar_t docName[100], dataType[100];
wcscpy_s(docName, 100, L"Print Job");
wcscpy_s(dataType, 100, L"RAW");
DocInfo.pDocName = docName;
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = dataType;
例:
const QString pName = "EPSON LX-300+ /II";
wchar_t printerName[100];
pName.toWCharArray(printerName);
pName[pName.length()] = '\0';
HANDLE hprinter;
if (OpenPrinter(printerName, &hprinter, NULL))
{
DOC_INFO_1 DocInfo;
wchar_t docName[100], dataType[100];
wcscpy_s(docName, 100, L"Print Job");
wcscpy_s(dataType, 100, L"RAW");
DocInfo.pDocName = docName;
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = dataType;
DWORD printJob = StartDocPrinter(hprinter, 1, (LPBYTE)&DocInfo);
if (printJob && StartPagePrinter(hprinter))
{
MessageBox(0, L"StartPagePrinter OKAY", 0, 0);
DWORD written = 0;
int buflen = 100;
char *buf = new char[buflen];
strcpy_s(buf, buflen, "123");
if (WritePrinter(hprinter, buf, 3, &written))
MessageBox(0, L"OKAY", 0, 0);
delete[]buf;
EndPagePrinter(hprinter);
EndDocPrinter(hprinter);
}
ClosePrinter(hprinter);
}
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