c++ - app.exe has triggered a break point, followed by Access violation writing location -

-

i have qt c++ application huge code base. i'm kinda familiar architecture don't know of code. every time application closed, shows message "app.exe has triggered break point" , if hit continue,

"unhandled exception @ 0x6701c95d (qtcored4.dll) in app.exe: 0xc0000005: access violation writing location 0x0c3e9fd8."

with stack trace looking this

enter image description here

i have app verifier hooked , dumps in output window

=========================================================== verifier stop 0000000000000013: pid 0x2654: first chance access violation current stack trace       000000000c3e9fd8 : invalid address being accessed     000000006701c95d : code performing invalid access     000000000008eb40 : exception record. use .exr display it.     000000000008e650 : context record. use .cxr display it. =========================================================== verifier stop continuable.  after debugging use `go' continue. ===========================================================

my question is, how 1 go trying debug find out what's causing issue? don't have experience in unmanaged programming world , i'm lost. appreciated.

chances you've either got memory corruption caused buffer overflow, or double deletion of dangling pointer. sort of thing can happen when calling qt code if don't realise qobject's parent takes ownership of it, bart notes. using app verifier, try running gflags debugging tools windows , enable page heap debugging may localise problem.


Comments

Post a Comment

Popular posts from this blog

delphi - How to convert bitmaps to video? -

-
Image
my application creates images fractals , love feeling of 'flying' around fractal. once saved 2000 bitmaps file , created avi using premiere. experience rather frustrating though succeeded in creating movie. spectacular. of course want create video application. don't care niftyness of codec, compression or whatever. want have video can replay on systems. in past have tried never succeeded. triggered question alas not ffmpeg running. update i decided adapt question , put bounty it. have seen several solutions attractive (because it's simple) seems me taviwrite. tried taviwriter did not succeed. in procedure taviwriter.write; function call around line 370 avierr := avisavev(s, // pchar(filename), nil, // file handler nil, // callback nstreams, // number of streams streams, compoptions); // compress options
Read more

jasper reports - Fixed header in Excel using JasperReports -

-
how can create excel report fixed header using japserreports? mean need header fixed when scroll excel file. this possible adding couple properties in jrxml file each report. take @ advanced excel features freeze panes. if wanted freeze after first column header (down left side basically) this: <statictext> <reportelement style="sans_bold" mode="opaque" x="0" y="60" width="104" height="20" forecolor="#ffffff" backcolor="#666666"> <property name="net.sf.jasperreports.export.xls.auto.filter" value="start"/> <property name="net.sf.jasperreports.export.xls.column.width" value="110"/> <property name="net.sf.jasperreports.export.xls.freeze.column.edge" value="left"/> </reportelement> &
Read more

python - ('The SQL contains 0 parameter markers, but 50 parameters were supplied', 'HY000') or TypeError: 'tuple' object is not callable -

-
import pyodbc,nltk,array cnxn = pyodbc.connect('driver={mysql odbc 5.1 driver};server=127.0.0.1;port=3306;database=information_schema;user=root; password=1234;option=3;') cursor = cnxn.cursor() cursor.execute("use collegedatabase ;") cursor.execute("select * sampledata ; ") cnxn.commit() s=[] j=[] x=[] words = [] w = [] sfq = [] pos=[] entry in cursor: s.append(entry.injury_type),j.append(entry.injury_desc) nltk.tokenize import punktwordtokenizer nltk.corpus import stopwords tokenizer = punktwordtokenizer() english_stops = set(stopwords.words('english')) in range(0,26): # filter stop words tokenizer.tokenize(j[i]) w.append([word word in tokenizer.tokenize(j[i]) if word not in english_stops]) in range(0 , 26):#converting tokenzied text ito string sfq.append(" ".join(w[a])) replacers import regexpreplacer replacer = regexpreplacer() in range (0,26):#pos tagging replacer.repl
Read more