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main.cpp
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181 lines (171 loc) · 3.71 KB
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#include <QCoreApplication>
#include <QFile>
#include <QDebug>
#include <QDataStream>
void demo1QDataStream(QFile& file);
void demo2QDataStream(QFile& file);
void demo3QDataStream(QFile& file);
void demo4QDataStream(QFile& file);
void demo2_1QDataStream(QFile& file);
const QString FILE_NAME = "czyQDataStreamDemo.file";
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QFile file(FILE_NAME);
//demo1QDataStream(file);
//demo2QDataStream(file);
//demo3QDataStream(file);
demo4QDataStream(file);
//demo2_1QDataStream(file);
return a.exec();
}
void demo1QDataStream(QFile& file)
{
qDebug()<<__FUNCTION__;
if(file.open(QIODevice::WriteOnly))
{
file.seek(0);
QDataStream out(&file);
char data[256];
memset(data,0,256*sizeof(char));
const char* p = "this is QDataStream demo";
strcpy(data,p);
out<<(data,256);
file.close();
}
else
{
qDebug()<<file.errorString();
}
}
void demo2QDataStream(QFile& file)
{
qDebug()<<__FUNCTION__;
if(file.open(QIODevice::WriteOnly))
{
QDataStream out(&file);
char data[256];
memset(data,0,256*sizeof(char));
const char* p = "this is QDataStream demo";
strcpy(data,p);
out.writeBytes(data,256);
file.close();
}
else
{
qDebug()<<file.errorString();
}
if(file.open(QIODevice::ReadOnly))
{
QDataStream out(&file);
char *data;
uint len;
out.readBytes(data,len);
if(len > 0)
{
qDebug()<<data;
delete[] data;
}
file.close();
}
else
{
qDebug()<<file.errorString();
}
}
void demo3QDataStream(QFile& file)
{
qDebug()<<__FUNCTION__;
if(file.open(QIODevice::WriteOnly))
{
QDataStream out(&file);
char data[256];
memset(data,0,256*sizeof(char));
const char* p = "this is QDataStream demo";
strcpy(data,p);
out.writeRawData(data,256);
file.close();
}
else
{
qDebug()<<file.errorString();
}
if(file.open(QIODevice::ReadOnly))
{
QDataStream out(&file);
char data[256];
memset(data,1,256*sizeof(char));
out.readRawData(data,256);
qDebug()<<data;
file.close();
}
else
{
qDebug()<<file.errorString();
}
}
void demo4QDataStream(QFile& file)
{
qDebug()<<__FUNCTION__;
if(file.open(QIODevice::WriteOnly))
{
QDataStream out(&file);
char data[256];
memset(data,0,256*sizeof(char));
const wchar_t * p = L"this is QDataStream demo 这里还有中文！";
strcpy(data,p);
out.writeRawData(data,256);
file.close();
}
else
{
qDebug()<<file.errorString();
}
if(file.open(QIODevice::ReadOnly))
{
QDataStream out(&file);
char data[256];
memset(data,1,256*sizeof(char));
out.readRawData(data,256);
qDebug()<<data;
file.close();
}
else
{
qDebug()<<file.errorString();
}
}
void demo2_1QDataStream(QFile& file)
{
qDebug()<<__FUNCTION__;
if(file.open(QIODevice::WriteOnly))
{
QDataStream out(&file);
int i = 0;
for (;i<10;++i)
{
out<<i;
}
file.close();
}
else
{
qDebug()<<file.errorString();
}
if(file.open(QIODevice::ReadOnly))
{
QDataStream out(&file);
int i = 0;
for (;i<10;++i)
{
int data;
out>>data;
qDebug() << data;
}
file.close();
}
else
{
qDebug()<<file.errorString();
}
}