[QScintilla] Incremental way of loading a a big file in QScintilla (Very very important)

[Roshni Lalwani]

A gentle reminder

On Mon, Jun 13, 2016 at 6:10 PM, Roshni Lalwani <roshiba81 at gmail.com> wrote:

> A gentle reminder. I am stuck in my problem and your help will he really
> helpful
>
> On Sat, Jun 11, 2016 at 4:01 PM, Roshni Lalwani <roshiba81 at gmail.com>
> wrote:
>
>> If we load the fiile a file in in object of QScintilla  using folllowing
>> code
>>
>>
>> Header myEditor.h
>>
>> class myScintilla: public QScintilla {
>>      public readFile();};
>> #include  "myEditor.h"void myEditor::readFile() {
>>
>>    if (FILE* fp = fopen(ofilename.toLatin1(), "r")) {
>>     QTextStream ts(fp, QIODevice::ReadOnly);
>>     int bufferSize =(1024* 1024)/2;
>>     do {
>>       QString s = ts.read(bufferSize);
>>       append(s);
>>     } while(!ts.atEnd());}
>>
>>
>>
>> there will be still performance issue while reading large files. It took
>> around
>>
>> 1) 25 seconds to read a file of size 1.5 GB. (Machine cores 4 , 16 GB
>> RAM) 2 10 seconds of file of size 512MB (on same machine)
>>
>> Is there any way we can load the file in QScintilla object incrementally
>> based on movement of scrollbar?
>>
>> There is  ILoader in Scintilla::ScintillaEdit that has the capabilty .
>> How Can we have same capability in object of QScintilla  and how Can we
>> use ILoader  in object of QScintilla
>>
>>
>> The Scintilla documentation can be found at:
>>
>> Here’s the basic mechanism to load the source into Scintilla using
>> ILoader. dEditorPtr is an instance of Scintilla::ScintillaEdit. lFileSize
>> is the size of the source file in bytes.
>>
>>
>>
>> char lBuffer[8192];
>>
>> size_t lCnt;
>>
>> ILoader *lLoader = (ILoader*) dEditorPtr->createLoader(lFileSize);
>>
>> FILE* lFP = fopen(ofilename.toLatin1(), “r”);
>>
>> while (!feof(lFP)) {
>>
>>    lCnt = fread(lBuffer, 1, sizeof(lBuffer), lFP);
>>
>>    if (lLoader->AddData(lBuffer, lCnt) != SC_STATUS_OK) {
>>
>>       // report error
>>
>>    }
>>
>> }
>>
>> dEditorPtr->setDocPointer(lLoader->ConvertToDocument());
>>
>>
>
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