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DCLibraries/dCArun/datei.cpp

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// written by Thomas Sax, Jan.2022
#include "datei.h"
// -------------------------------------------------------------------------------------------------
// ------------------------------------------------------ create csv file -------------------------------
// -------------------------------------------------------------------------------------------------
QByteArray datei_writeArray, datei_tempArray;
void csv_startCreatingFile(void)
{
datei_writeArray.clear();
datei_tempArray.clear();
}
void csv_addTextToFile(QString myText)
{
datei_writeArray.append(myText.toLatin1());
datei_writeArray.append(FILESEPERATOR);
}
void csv_addIntToFile(int myValue)
{
//qulonglong ullt=12345678901234567890; // max 1,844 x10^19
datei_tempArray.setNum(myValue,10); // accepted types: short, ushort, int, uint,
// qlonglong, qulonglong, float, double
// numerbase can be 2...36(!),10=dec
datei_writeArray.append(datei_tempArray);
datei_writeArray.append(FILESEPERATOR);
}
void csv_addUintToFile(uint myValue)
{
datei_tempArray.setNum(myValue,10);
datei_writeArray.append(datei_tempArray);
datei_writeArray.append(FILESEPERATOR);
}
void csv_addLongvalToFile(qlonglong myValue)
{
datei_tempArray.setNum(myValue,10);
datei_writeArray.append(datei_tempArray);
datei_writeArray.append(FILESEPERATOR);
}
void csv_addUlongvalToFile(qulonglong myValue)
{
datei_tempArray.setNum(myValue,10);
datei_writeArray.append(datei_tempArray);
datei_writeArray.append(FILESEPERATOR);
}
/*
void csv_addCurrentTimeToFile(void)
{
uint8_t hour, minute, sec, ui8buf[20];
char buf[20];
config_getSysTime(&hour, &minute, &sec);
GetTimeString(hour, minute, sec, 0, 1, ui8buf);
for (uint8_t nn=0; nn<20; nn++)
buf[nn]=char(ui8buf[nn]);
datei_writeArray.append(buf,8); // time string
datei_writeArray.append(FILESEPERATOR);
}
void csv_addCurrentDateToFile(void)
{
uint16_t year;
uint8_t month, day, ui8buf[20];
char buf[20];
config_getSystemDate(&year, &month, &day);
//qDebug()<<"date year: "<<year;
GetDateString(day, month, 0x20, uint8_t(year%100), 0, 0, ui8buf);
for (uint8_t nn=0; nn<20; nn++)
buf[nn]=char(ui8buf[nn]);
datei_writeArray.append(buf, 10); // date string
datei_writeArray.append(NEWLINEINFILE);
}
*/
void csv_addNewlineToFile(void)
{
datei_writeArray.chop(1); // Komma weg
datei_writeArray.append(NEWLINEINFILE);
}
QByteArray csv_readbackArray(void)
{
return datei_writeArray;
}
/*
QByteArray csv_writeContent_testValues(void)
{
QByteArray myBA, tmpBA;
uint8_t modCount=5, modAddr=23;
uint8_t hour, minute, sec, month, day, ui8buf[20];
uint16_t year, modType=45678;
char buf[20];
uint32_t modNrDIs=1234567890;
uint8_t modNrAIs=4, modNrCtr=2, modNrDOs=8;
int modNrAOs=-2;
myBA.clear();
tmpBA.clear();
myBA.append("scan time");
myBA.append(FILESEPERATOR);
datei_getSysTime(&hour, &minute, &sec);
GetTimeString(hour, minute, sec, 0, 1, ui8buf);
for (uint8_t nn=0; nn<20; nn++)
buf[nn]=char(ui8buf[nn]);
myBA.append(buf,8); // time string
myBA.append(FILESEPERATOR);
datei_getSystemDate(&year, &month, &day);
//qDebug()<<"date year: "<<year;
GetDateString(day, month, 0x20, uint8_t(year%100), 0, 0, ui8buf);
for (uint8_t nn=0; nn<20; nn++)
buf[nn]=char(ui8buf[nn]);
myBA.append(buf, 10); // date string
myBA.append(NEWLINEINFILE);
myBA.append("number of modules");
myBA.append(FILESEPERATOR);
tmpBA.setNum(modCount,10); //2nd para = number base 2, 8, 10 or 16 (bin, oct, dec, hex)
myBA.append(tmpBA);
myBA.append(NEWLINEINFILE);
myBA.append("busaddr");
myBA.append(FILESEPERATOR);
myBA.append("type");
myBA.append(FILESEPERATOR);
myBA.append("NrOfDI");
myBA.append(FILESEPERATOR);
myBA.append("NrOfAI");
myBA.append(FILESEPERATOR);
myBA.append("NrOfCtrIn");
myBA.append(FILESEPERATOR);
myBA.append("NrOfDO");
myBA.append(FILESEPERATOR);
myBA.append("NrOfAO");
myBA.append(NEWLINEINFILE);
tmpBA.setNum(modAddr,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modType,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modNrDIs,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modNrAIs,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modNrCtr,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modNrDOs,10);
myBA.append(tmpBA);
myBA.append(FILESEPERATOR);
tmpBA.setNum(modNrAOs,10);
myBA.append(tmpBA);
myBA.append(NEWLINEINFILE);
return myBA;
}
*/
// -------------------------------------------------------------------------------------------------
// ------------------------------------------------------ parse csv file -------------------------------
// -------------------------------------------------------------------------------------------------
// first: QByteArray datei_readFromFile(QString filename);
uint32_t csv_nrOfEntriesInFile(QByteArray readFromFile)
{
// count sequences between FILESEPERATOR and NEWLINEINFILE
uint32_t filSize=0, pp=0;
char oneByt=0;
int filLen=readFromFile.size();
if(filLen>1)
filSize=uint32_t(filLen);
else
return 0;
// 1) find position of seperators
for (uint32_t ii=0; ii<filSize; ii++)
{
oneByt=readFromFile[ii];
if (oneByt==FILESEP1 || oneByt==FILESEP2 || oneByt==NEWLINEINFILE)
pp++;
}
// now: pp = number of seperators
// oneByt = last byte in file. If it's not a seperator then
// there's one more entry (last entry without termination)
if (oneByt !=FILESEP1 && oneByt !=FILESEP2 && oneByt !=NEWLINEINFILE)
pp++;
//qDebug()<<"csv: nr of sequences="<< pp;
return pp;
}
QByteArray csv_getOneFileSequence(QByteArray sourceFile, uint32_t sequNr)
{
// seperate file content in single sequences between FILESEPERATOR and NEWLINEINFILE
// and return "entryNr" - entry
// for this first step leave data type QByteArray
// 2nd step can change in numbers and strings
QByteArray sequence;
uint32_t sepPos[MAXNUMBEROFSEQUENCES];
uint32_t filSize=0, pp=0, ii, start=0, ende=0;
char oneByt;
int filLen, mm;
filLen=sourceFile.size();
//qDebug()<<"fillen="<< filLen;
if(filLen<10)
return "";
filSize=uint32_t(filLen);
if (sequNr>MAXNUMBEROFSEQUENCES)
return "";
// 1) find position of seperators
for (ii=0; ii<filSize; ii++)
{
oneByt=sourceFile[ii];
if (oneByt==FILESEP1 || oneByt==FILESEP2 || oneByt==NEWLINEINFILE)
{
sepPos[pp++]=ii;
}
}
// now: pp = number of entries
//qDebug()<<"nr of seperators="<< pp;
if (sequNr>=pp)
return "";
// 2) get sequence
if (sequNr==0)
{
start=0;
ende=sepPos[sequNr];
} else
if (sequNr>0)
{
start=sepPos[sequNr-1]+1;
ende=sepPos[sequNr];
}
//qDebug()<<"datei getOneFileSequence start/ende: "<<start << " " << ende;
if (start>=ende)
return "";
//return "-err3-";
sequence.clear();
//batmp.clear();
pp=0;
for (ii=start; ii<ende; ii++)
{
mm=int(ii);
if (mm>=int(filSize))
mm=0;
oneByt=sourceFile.at(mm);
sequence.append(oneByt);
}
return sequence;
}
int csv_getEntryAsInt(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA, myVA;
int entry=0;
bool ok;
myVA.clear();
myBA = csv_getOneFileSequence(sourceFile, sequNr);
//qDebug()<<"datei getEntryAsInt, sequence: " << myBA;
entry=myBA.toInt(&ok,16);
if (ok)
{
//qDebug()<<"datei getEntryAsInt, number: " << entry;
return entry;
}
//qDebug()<<"datei getEntryAsInt, error " << myBA;
return 0;
}
int32_t csv_getEntryAsLong(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
long entry=0;
bool ok;
entry=myBA.toLong(&ok,10);
if (ok)
return entry;
return 0;
}
uint8_t csv_getEntryAsUshort(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
uint8_t entry=0;
bool ok;
entry=uint8_t(myBA.toUShort(&ok,10));
if (ok)
return entry;
return 0;
}
uint16_t csv_getEntryAsUint(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
uint16_t entry=0;
bool ok;
entry=uint16_t(myBA.toUInt(&ok,10));
if (ok)
return entry;
return 0;
}
uint32_t csv_getEntryAsUlong(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
uint32_t entry=0;
bool ok;
entry=myBA.toULong(&ok,10);
if (ok)
return entry;
return 0;
}
uint64_t csv_getEntryAs2Ulong(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
uint64_t entry=0;
bool ok;
entry=myBA.toULongLong(&ok,10);
if (ok)
return entry;
return 0;
}
QString csv_getEntryAsString(QByteArray sourceFile, uint32_t sequNr)
{
QByteArray myBA = csv_getOneFileSequence(sourceFile, sequNr);
QString entry;
//qDebug()<<"datei getEntryAsString, sequence: " << myBA;
entry=myBA.toStdString().c_str();
return entry;
}
// -------------------------------------------------------------------------------------------------
// ------------------------------------------------------ create Json file -------------------------------
// -------------------------------------------------------------------------------------------------
/*
example
QString str = "{"
" \"Herausgeber\": \"Xema\","
" \"Nummer\": \"1234-5678-9012-3456\","
" \"Deckung\": 2e+6,"
" \"Währung\": \"EURO\","
" \"Inhaber\": {"
" \"Name\": \"Mustermann\","
" \"Vorname\": \"Max\","
" \"männlich\": true,"
" \"Hobbys\": [ \"Reiten\", \"Golfen\", \"Lesen\" ],"
" \"Alter\": 42,"
" \"Kinder\": [],"
" \"Partner\": null"
" }"
"}";
*/
QString myJsonCon;
QString tmpStr;
void json_startRecord(void)
{
myJsonCon.clear();
tmpStr.clear();
myJsonCon.append('{');
}
void json_enterIntToRecord(QString attribute, ulong i_value)
{
tmpStr.clear();
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
tmpStr.setNum(i_value);
myJsonCon.append(tmpStr);
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
void json_enterTextToRecord(QString attribute, QString txt_value)
{
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
myJsonCon.append('"');
myJsonCon.append(txt_value);
myJsonCon.append('"');
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
/*
void json_addCurrentTimeToRecord(QString attribute)
{
uint8_t hour, minute, sec, ui8buf[20];
//char buf[20];
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
myJsonCon.append('"');
datei_getSysTime(&hour, &minute, &sec);
GetTimeString(hour, minute, sec, 0, 1, ui8buf);
for (uint8_t nn=0; nn<8; nn++)
myJsonCon.append(ui8buf[nn]);
myJsonCon.append('"');
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
void json_addCurrentDateToRecord(QString attribute)
{
uint16_t year;
uint8_t month, day, ui8buf[20];
//char buf[20];
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
myJsonCon.append('"');
datei_getSystemDate(&year, &month, &day);
GetDateString(day, month, 0x20, uint8_t(year%100), 0, 0, ui8buf);
for (uint8_t nn=0; nn<10; nn++)
myJsonCon.append(ui8buf[nn]);
myJsonCon.append('"');
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
*/
void json_enterArrayToRecord(QString attribute, uint8_t *buf, ulong nrofVals)
{
// add array of numbers with "nrofVals" elements
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
myJsonCon.append('['); // eckig!!!
for (ulong ul=0; ul<nrofVals; ul++)
{
tmpStr.setNum(buf[ul]);
myJsonCon.append(tmpStr);
myJsonCon.append(',');
}
myJsonCon.chop(1); // Komma weg
myJsonCon.append(']'); // eckig!!!
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
void json_enterStructToRecord(QString attribute)
{
// every call must be concluded with "json_finishFile()"
myJsonCon.append('"');
myJsonCon.append(attribute);
myJsonCon.append('"');
myJsonCon.append(':');
myJsonCon.append('{'); // geschweift!!
myJsonCon.append(NEWLINEINFILE);
}
void json_finishStruct(void)
{
myJsonCon.chop(2); // remove , and \r from the end
myJsonCon.append('}');
myJsonCon.append(',');
myJsonCon.append(NEWLINEINFILE);
}
void json_finishRecord(void)
{
myJsonCon.chop(2); // remove , and \r from the end
myJsonCon.append(NEWLINEINFILE);
myJsonCon.append('}');
myJsonCon.append(NEWLINEINFILE);
}
QString json_readbackRecordStr(void)
{
return myJsonCon;
}
QByteArray json_readbackRecordBa(void)
{
return myJsonCon.toLatin1();
}
// -------------------------------------------------------------------------------------------------
// ------------------------------------------------------ parse Json file -------------------------------
// -------------------------------------------------------------------------------------------------
/*
example Json File:
{"temperature":28,
"snow":"no",
"Zeit":"16_21_45",
"sunny":"12h",
"humidity":75,
"wann ":"24.01.2022",
"unterstruktur":{
"day of week":"tuesday",
"year":22,
"month":1,
"day":24},
"fast am":"Ende",
"Puffer":[8,3,9,2,10]
}
*/
// first: QByteArray datei_readFromFile(QString filename);
int json_nrOfPairsInFile(QByteArray filename)
{
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
// key value pair consisting of key (unique string) and value (QJsonValue)
int nrOfPairs=jobj.size();
qDebug() << "my Json file has got: " << nrOfPairs<< "pairs";
return nrOfPairs;
}
bool json_exists(QByteArray filename, QString searchForKey)
{
// look for "searchForKey" =name of the pair (left of : )
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchForKey))
return true;
return false;
}
bool json_remove(QByteArray filename, QString searchFor)
{
// look for "searchFor" =name of the pair (left of : ) and remove the record from file
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchFor))
{
jobj.remove(searchFor);
return true;
}
return false;
}
QString json_searchForStringInFile(QByteArray filename, QString searchFor)
{
// look for "searchFor" =name of the pair (left of : ) and return value of this pair (right of : ) as String
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchFor))
{
return jobj[searchFor].toString(); // toObject(); toArray();
} else
{
//qDebug() << "pairname not found in Json file";
return "";
}
}
int json_searchForIntInFile(QByteArray filename, QString searchFor)
{
// look for "searchFor" =name of the pair (left of : ) and return value of this pair (right of : ) as String
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchFor))
{
return jobj[searchFor].toInt(); // toObject(); toArray();
} else
{
//qDebug() << "number not found in Json file";
return 0;
}
}
bool json_searchForObjectInFile(QByteArray filename, QString searchFor, QJsonObject *oneObject)
{
// return an object from the json file
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchFor))
{
*oneObject = jobj[searchFor].toObject();
return true;
} else
{
//qDebug() << "Object not found in Json file";
return false;
}
}
int json_nrOfPairsInObject(QJsonObject objname)
{
int nrOfPairs=objname.size();
qDebug() << "my Json Object has got: " << nrOfPairs<< "pairs";
return nrOfPairs;
}
QString json_searchForStringInObject(QJsonObject objname, QString searchFor)
{
// look for "searchFor" =name of the pair (left of : ) and return value of this pair (right of : ) as String
if (objname.contains(searchFor))
{
return objname[searchFor].toString();
} else
{
//qDebug() << "string not found in Json object";
return "";
}
}
int json_searchForIntInObject(QJsonObject objname, QString searchFor)
{
// look for "searchFor" =name of the pair (left of : ) and return value of this pair (right of : ) as String
if (objname.contains(searchFor))
{
return objname[searchFor].toInt();
} else
{
//qDebug() << "number not found in Json file";
return 0;
}
}
bool json_searchForArrayInFile(QByteArray filename, QString searchFor, QJsonArray *oneArray)
{
// look for "searchFor" =name of the pair (left of : ) and return value of this pair (right of : ) as String
QJsonDocument jdoc = QJsonDocument::fromJson(filename);
QJsonObject jobj = jdoc.object();
if (jobj.contains(searchFor))
{
*oneArray = jobj[searchFor].toArray();
return true;
} else
{
//qDebug() << "Array not found in Json file";
return false;
}
}
int json_nrOfValuesInArray(QJsonArray arrayname)
{
int nrOfPairs=arrayname.size();
qDebug() << "my Json Array has got: " << nrOfPairs<< "values";
return nrOfPairs;
}
bool json_getValuesOfArray(QJsonArray arrayname, int *buf, int MaxBufferSize)
{
// assuming that the array consists of integers
/* copy to local buffer:
#define MAXNROFARRAYVALUES 100
int buf[MAXNROFARRAYVALUES], ii;
int nrOfPairs=arrayname.size();
if (nrOfPairs>MAXNROFARRAYVALUES)
nrOfPairs=MAXNROFARRAYVALUES;
for (ii=0; ii<nrOfPairs; ii++)
buf[ii]=arrayname[ii].toInt();
*/
// copy to host buffer:
bool ok=true;
int nrOfPairs=arrayname.size();
if (nrOfPairs>MaxBufferSize)
{
ok=false; // got not all
nrOfPairs=MaxBufferSize;
}
for (int ii=0; ii<nrOfPairs; ii++)
buf[ii]=arrayname[ii].toInt();
return ok;
}
/*
void datei_json_readTestFile(QString filename)
{
QByteArray my2Ba;
QString my2Str;
my2Str.clear();
my2Ba=datei_readFromFile(filename);
QJsonDocument jdoc = QJsonDocument::fromJson(my2Ba);
QJsonObject jobj = jdoc.object();
//QJsonParseError jerror;
QJsonObject myObj;
QJsonArray myArray;
// key value pair consisting of key (unique string) and value (QJsonValue)
int nrOfPairs=jobj.size();
qDebug() << "my Json file has got: " << nrOfPairs<< "pairs";
if (jobj.contains("Zeit"))
qDebug() << "my Json file: " << jobj["Zeit"].toString(); // toObject(); toArray();
else
qDebug() << "my Json file contains no Zeit";
if (jobj.contains("Humidity"))
qDebug() << "my Json file: " << jobj["humidity"].toInt();
else
qDebug() << "my Json file contains no Humidity";
if (jobj.contains("month"))
qDebug() << "my Json file: " << jobj["month"].toObject(); // anzeige QJsonObject()
else
qDebug() << "my Json file contains no month";
myObj=jobj["unterstruktur"].toObject();
qDebug() << "my unterstruktur: " << myObj["month"].toInt();
qDebug() << "my unterstruktur: " << myObj["day of week"].toString();
//if (jerror.error == QJsonParseError::NoError)
// qDebug() << "no error";
qDebug() << "my Month: " << myObj["Month"].toInt();
//if (myObj["Month"] == QJsonValue::Undefined)
// qDebug() << "no found"; geht nicht
//if (jerror.error != QJsonParseError::NoError)
// qDebug() << "no found";
myArray=jobj["Puffer"].toArray();
qDebug() << "my array " <<myArray[2].toInt();
//if (jerror.error != QJsonParseError::NoError)
// qDebug() << "no found";
if ( !jobj.contains("Puffer"))
qDebug() << "no Puffer found";
if ( !myArray.contains(20))
qDebug() << "no entry found";
} */
// -------------------------------------------------------------------------------------------------
// ------------------------------------------------------ read, write, copy files -------------------
// -------------------------------------------------------------------------------------------------
void datei_closeFile(QString filename)
{
QFile file(filename);
file.close();
}
QByteArray datei_readFromFile(QString filename)
{
//QFile file("/own/H2B/dc2.hex");
//QFile file(FILENAME_STRUCTURE);
QFile file;
file.setFileName(filename);
QByteArray myBA;
myBA.clear();
if (!file.exists())
{
qDebug()<<"file not exists";
return myBA;
} else
{
if (!file.open(QIODevice::ReadOnly) )
{
qDebug()<<"cannot open";
} else
{
//qDebug()<<"loading file with " << file.size() <<"byte";
myBA = file.readAll();
//qDebug()<<"datei read: " << myBA;
file.close();
}
}
return myBA;
}
bool datei_ifFileExists(QString filename)
{
QFile file;
file.setFileName(filename);
if (file.exists())
return true;
return false;
}
char datei_writeToFile(QString filename, QByteArray content)
{
// retval=0 if successful 1: no write access allowed 2:cannot open to append 3:cannot create new file
QFile file(filename);
QFileInfo myFI(filename);
//if (!myFI.isWritable()) //geht nur bei NTFS, weg.
//{
//file.setPermissions(filename, QFile::WriteOther); geht nicht :(
// qDebug()<<"datei_writeToFile: writing not allowed. set attributes first!";
// return 1;
//}
if (file.exists())
{
if (!file.open(QIODevice::Append))
{
qDebug()<<"datei_writeToFile cannot open to append";
return 2;
} else
{
// add new object to the end of the file
file.write(content);
file.close();
return 0; // OK
}
} else
{
if (!file.open(QIODevice::WriteOnly))
{
qDebug()<<"datei_writeToFile cannot open new";
return 3;
} else
{
qDebug()<<"create new file";
// write first lines into file
file.write(content);
file.close();
return 0; // OK
}
}
return 0;
}
bool datei_copyFile(QString currentFileName, QString newFileName)
{
// retval=true if successful
QFile file;
file.setFileName(currentFileName);
return file.copy(newFileName);
}
bool datei_clearFile(QString filename)
{
// retval=true if successful
QFile file;
file.setFileName(filename);
file.remove(); // 3.2.22 erst ganz löschen wegen Schreibrechten
if (!file.open(QIODevice::WriteOnly))
{
qDebug()<<"datei_clearFile cannot open file to delete";
return false;
} else
{
file.write(0);
file.close();
return true;
}
}
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