{"id":1731,"date":"2022-08-30T15:18:58","date_gmt":"2022-08-30T15:18:58","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/29\/problem-about-writefile-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:18:58","modified_gmt":"2022-08-30T15:18:58","slug":"problem-about-writefile-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/problem-about-writefile-collection-of-common-programming-errors\/","title":{"rendered":"problem about writefile-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/17ae331d242d3dd9fb2e44d1d1639ae2?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nThePlague<br \/>\nc++ access-violation writefile<br \/>\nSo basically I wish to write a byte array to a file, however the program crashes. Unhandled exception at 0x7766DEE1 (KernelBase.dll) in append.exe: 0xC0000005: Access violation writing location 0x00000000.BYTE *image ; BYTE *bigMem; #define REASONABLY_LARGE_BUFFER 16777216 file = CreateFile(fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);fileSize = GetFileSize(file, NULL);bigMem = (BYTE *)HeapCreate(NULL, REASONABLY_LARGE_BUFFER, 0); image = (BYTE *)<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/101889513654ccabf2cff98d3352e74c?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nYakov<br \/>\nc++ windows writefile freopen<br \/>\nI have wrote the following code:int fd = _dup(fileno(stdout)); FILE* tmp = freopen(&#8220;tmp&#8221;,&#8221;w+&#8221;,stdout); HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE); if (out == INVALID_HANDLE_VALUE){\/\/error } else if (out == NULL) {\/\/error } else {WriteFile(out, &#8220;num&#8221;, sizeof(&#8220;num&#8221;), NULL, NULL);}In the last line I get an assertion &#8220;Unhandled exception&#8230;:Access violation writing location 0x000000&#8221; What could be a problem and the fix for it?Thank you.P.S:Due to limitation of the project I can`t use freopen<\/li>\n<\/ul>\n<p id=\"rop\"><small>Originally posted 2013-11-29 06:24:35. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>ThePlague c++ access-violation writefile So basically I wish to write a byte array to a file, however the program crashes. Unhandled exception at 0x7766DEE1 (KernelBase.dll) in append.exe: 0xC0000005: Access violation writing location 0x00000000.BYTE *image ; BYTE *bigMem; #define REASONABLY_LARGE_BUFFER 16777216 file = CreateFile(fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);fileSize = GetFileSize(file, NULL);bigMem = [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1731","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=1731"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1731\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=1731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=1731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=1731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}