{"id":63366,"date":"2023-12-19T07:11:55","date_gmt":"2023-12-19T07:11:55","guid":{"rendered":"http:\/\/www.accessrepairnrecovery.com\/blog\/?p=63366"},"modified":"2023-12-19T11:51:19","modified_gmt":"2023-12-19T11:51:19","slug":"fix-access-bad-dll-calling-convention-error","status":"publish","type":"post","link":"https:\/\/www.accessrepairnrecovery.com\/blog\/fix-access-bad-dll-calling-convention-error","title":{"rendered":"Access Hacks: Conquer &#8220;Runtime Error 49 Bad DLL Calling Convention&#8221;!"},"content":{"rendered":"<div class=\"8e1a49907eb0ebe2b39ac6355e555698\" data-index=\"1\" style=\"float: none; margin:0px 0 0px 0; text-align:center;\">\n<style>\r\n.leaderboard { width: 320px; height: 100px; }\r\n@media(min-width: 500px) { .leaderboard { width: 468px; height: 60px; } }\r\n@media(min-width: 800px) { .leaderboard { width: 728px; height: 90px; } }\r\n<\/style>\r\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8329139124199643\" crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle leaderboard\"\r\n     style=\"display:inline-block\"\r\n\t data-full-width-responsive=\"true\"\r\n     data-ad-client=\"ca-pub-8329139124199643\"\r\n     data-ad-slot=\"1972481166\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p style=\"text-align: justify;\">Microsoft Access <strong>runtime error 49 bad DLL calling convention<\/strong> typically occurs when there is a mismatch in the calling convention between a DLL (Dynamic Link Library) and the app calling it. This warning message can interrupt the normal functioning of Access software, leading to frustration for users. Therefore, it is necessary to address this problem to maintain the stability of the Access database.<!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-68142\" src=\"https:\/\/www.accessrepairnrecovery.com\/blog\/wp-content\/uploads\/2017\/10\/runtime-error-49-bad-DLL-calling-convention.png\" alt=\"runtime error 49 bad DLL calling convention\" width=\"434\" height=\"245\" \/><\/p>\n<p style=\"text-align: justify;\">In this article, we delve into the intricacies of the above-shown error, discovering its symptoms, causes, and troubleshooting methods.<\/p>\n<div style='margin: 10px 0; clear: both;'><div style='clear: both; border-top: 1px solid #eeeeee; border-bottom: 1px solid #eeeeee; margin: 30px auto; padding: 15px 15px 15px 20px; display: flex; align-items: center; justify-content: space-between;'><div style='margin-bottom: 0; line-height: 1.6; flex-shrink: 1;'><span style='color:#aaa; font-size: 13px;'>Rated <i>Excellent<\/i> on <a rel='nofollow' target='_blank' href='https:\/\/www.trustpilot.com\/review\/www.stellarinfo.com'><span style='color: #aaa;'>Trustpilot<\/span><\/a><\/span><br><strong>Free MS Access Database Repair Tool<\/strong><br>Repair corrupt MDB and ACCDB database files and recover deleted database tables, queries, indexes and records easily. Try Now!<br><div style='margin-top: 5px;'><a style='background: #b10923; border-radius: 25px; color: #ffffff; cursor: pointer; display: inline-block; font-size: 16px; font-weight: 500; padding: 0 16px; height: 40px; line-height: 40px; vertical-align: middle; white-space: nowrap; text-decoration: none; border: none;' href='https:\/\/www.accessrepairnrecovery.com\/blog\/get-access-file-repair-tool' target='_blank'><span style='color: #ffffff;'><i class='fas fa-arrow-alt-circle-down'><\/i><\/span> Download<\/a><br><span style='font-style: italic; display: block; font-size: 10px; margin-top: 10px;'>By clicking the button above and installing Stellar Repair for Access (14.8 MB), I acknowledge that I have read and agree to the <a href='https:\/\/www.accessrepairnrecovery.com\/eula.php' target='_blank'>End User License Agreement<\/a> and <a href='https:\/\/www.accessrepairnrecovery.com\/privacy-policy.php' target='_blank'>Privacy Policy<\/a> of this site.<\/span><\/div><\/div><\/div><\/div>\n<h3 style=\"text-align: left;\"><strong>Quick Navigation:<\/strong><\/h3>\n<ul>\n<li style=\"text-align: left;\"><strong><a href=\"#p1\">Part 1- About Dynamic Link Library &#8211; DLL<\/a><\/strong><\/li>\n<li style=\"text-align: left;\"><strong><a href=\"#p2\">Part 2- Understand Bad DLL Calling Convention Error<\/a><\/strong><\/li>\n<li style=\"text-align: left;\"><strong><a href=\"#p3\">Part 3- Symptoms Of Access Bad DLL Calling Convention\u00a0<\/a><\/strong><\/li>\n<li style=\"text-align: left;\"><strong><a href=\"#p4\">Part 4- Reasons for the Bad DLL Calling Convention Error<\/a><\/strong><\/li>\n<li style=\"text-align: left;\"><strong><a href=\"#p5\">Part 5- How to Fix Access Error 49 Bad DLL Calling Convention?<\/a><\/strong><\/li>\n<li style=\"text-align: left;\"><strong><a href=\"#p6\">Part 6- Issue Encountered due to Bad DLL Calling Convention (Error 49)<\/a><\/strong><\/li>\n<\/ul>\n<p style=\"text-align: justify;\">But before starting with the fixes, let&#8217;s grab detailed information on DLL.<\/p>\n<p><a name=\"p1\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>About Dynamic Link Library &#8211; DLL<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-68144\" src=\"https:\/\/www.accessrepairnrecovery.com\/blog\/wp-content\/uploads\/2017\/10\/dll-1.png\" alt=\"Dynamic Link Library - DLL\" width=\"258\" height=\"274\" \/><\/p>\n<p style=\"text-align: justify;\">It\u2019s an important file used in the Windows OS besides this it contains lots of multiple codes as well as procedures that are used for Windows programs.<\/p>\n<p style=\"text-align: justify;\">This <strong>dynamic link library (DLL)<\/strong> file format is created for the smooth running of multiple programs in the system. Using this file, the programs are allowed to use their respective information at the same time. Like any other system files, DLL files are vulnerable to corruption and errors. So when an issue like an error in loading DLL appears, it causes big trouble to users and therefore quick resolution of the error is required.<\/p>\n<p><a name=\"p2\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>Understand Bad DLL Calling Convention Error<\/strong><\/h2>\n<p style=\"text-align: justify;\">A <strong>bad DLL calling convention error<\/strong> occurs when one of the procedures finishes and returns to its calling procedure. However, the error message doesn\u2019t make any sense because you haven\u2019t called any DLL. Debugging and steeping to your code will make you get crazy because everything is perfectly fine in this, yet the error keeps popping up here. Ignoring such errors can result in application crashes, data loss, and compromised user experience.<\/p>\n<p><a name=\"p3\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>Symptoms Of Access Bad DLL Calling Convention\u00a0<\/strong><\/h2>\n<ul style=\"text-align: justify;\">\n<li>When such a Bad DLL calling convention occurs in the system, it crashes the program&#8217;s active window.<\/li>\n<li>Windows function will get changed and systems won\u2019t respond to commands correctly.<\/li>\n<li>At regular intervals, the system will freeze.<\/li>\n<\/ul>\n<p><a name=\"p4\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>Reasons for the Bad DLL Calling Convention Error<\/strong><\/h2>\n<p style=\"text-align: justify;\">Well there are several reasons behind the occurrence of this <strong>error 49 Bad DLL Convention error<\/strong>, so have a look over the most reasonable one:<\/p>\n<ol style=\"text-align: justify;\">\n<li style=\"text-align: left;\">The DLL file is not present directory specified in the path.<\/li>\n<li style=\"text-align: left;\">System hardware has been damaged.<\/li>\n<li style=\"text-align: left;\">The file does not belong to MS Windows DLL<\/li>\n<li style=\"text-align: left;\">Virus attacks on the system have affected the DLL file and have added some strange code and the code does not get removed when virus infection is removed from the system.<\/li>\n<li style=\"text-align: left;\">The file cannot be executed by the DLL.<\/li>\n<li style=\"text-align: left;\">DLL file gives the reference of another DLL file that does not exist<\/li>\n<li style=\"text-align: left;\">Other things that cause potential damage to the DLL file includes Spyware infection, hardware issue, or issues in the Windows registry, etc.<\/li>\n<\/ol>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Also Read:<\/strong>\u00a0<strong><a class=\"row-title\" href=\"https:\/\/www.accessrepairnrecovery.com\/blog\/how-to-solve-error-48-error-in-loading-dll\" aria-label=\"\u201cHow to solve Error 48: Error in loading DLL?\u201d (Edit)\">How to solve Error 48: Error in loading DLL?<\/a><\/strong><\/p>\n<\/blockquote>\n<p><a name=\"p5\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>How to Fix Access Runtime Error 49 Bad DLL Calling Convention?<\/strong><\/h2>\n<p style=\"text-align: justify;\">Here are a few options that you can try to fix error 49. So let\u2019s get started\u2026!<\/p>\n<h3 style=\"text-align: left;\"><strong>Method 1- Check the Library References\u00a0<\/strong><\/h3>\n<p style=\"text-align: justify;\">The very first thing that you need to check is whether the library references for your module code are valid or not.<\/p>\n<p style=\"text-align: justify;\">Go to the <em><strong>VBA IDE&gt; Tools,&gt; References<\/strong> <\/em>to see the list of referenced libraries.\u00a0 So watch carefully that none of the checked items are written \u201cmissing\u201d in front of it.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-67986\" src=\"https:\/\/www.accessrepairnrecovery.com\/blog\/wp-content\/uploads\/2020\/10\/go-to-tools-to-select-references.png\" alt=\"bad dll calling convention\" width=\"462\" height=\"171\" \/><\/p>\n<p style=\"text-align: justify;\">If so, then fix it and your issue will be resolved.<\/p>\n<h3 style=\"text-align: left;\"><strong>Method 2- Compile the State of VBA<\/strong><\/h3>\n<p style=\"text-align: justify;\">With time, the section of the Access database that stores VBA modules code can become bloated and sometimes throws strange errors such as <strong>Bad DLL calling convention<\/strong>. So when you compile and run code, VBA leaves behind the old version of the code which is no longer valid, but it is not removed from the database due to inaccessibility.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.accessrepairnrecovery.com\/blog\/compact-and-repair-access-database\" target=\"_blank\" rel=\"noopener\"><strong>Database compact and repair<\/strong><\/a> addresses the Jet tables in your database code.<\/p>\n<h3 style=\"text-align: left;\"><strong>Method 3- Other Workarounds<\/strong><\/h3>\n<p style=\"text-align: justify;\">Arguments passed to the dynamic-link library (DLL) should match well to those expected by the routine. As, the calling convention works with the type, number, and ordering of the arguments. This error has the following reasons and solutions, so have a look over it.<\/p>\n<ul style=\"text-align: justify;\">\n<li>Your program is calling a routine in a DLL that&#8217;s being passed the wrong type of argument.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Check out whether the argument type agrees with those specified in the declaration of the routine you are calling.<\/p>\n<ul style=\"text-align: justify;\">\n<li>Your program is calling a routine in DLL which passes the wrong number of arguments.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">So, check out that are you passing the same number of arguments indicated in the declaration of the routine you are calling.<\/p>\n<ul style=\"text-align: justify;\">\n<li>Your program is calling a routine in DLL, but not using the <strong>StdCall calling convention<\/strong>.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">If the DLL routine expects arguments by value, then make sure <strong>ByVal<\/strong>\u00a0is specified for those arguments in the declaration for the routine.<\/p>\n<p><a name=\"p6\"><\/a><\/p>\n<h2 style=\"text-align: left;\"><strong>Issue Encountered due to Bad DLL Calling Convention (Error 49)<\/strong><\/h2>\n<h3 style=\"text-align: left;\"><strong>Issue 1- Queries with VBA Code Function Suddenly Fail<\/strong><\/h3>\n<p style=\"text-align: justify;\">When this error appears, you will see that suddenly your VBA code function fails to work. Your queries have the VBA code start failing.<\/p>\n<h3 style=\"text-align: left;\"><strong>Issue 2- Compact and Repair Tool Doesn&#8217;t Work<\/strong><\/h3>\n<p style=\"text-align: justify;\">The initial assumption is that the database somehow gets corrupted, which is true up to some extent. Many of you might have also tried creating a new database and then importing their objects into it. it solves the issue to much extent.<\/p>\n<p style=\"text-align: justify;\">People then resort to creating a new database and importing their objects into it which is time-consuming and a pain. It solves the problem, but there&#8217;s a much easier way to tackle the situation in Compact &amp; Repair. However, due to MS Access bad DLL calling convention error <a href=\"https:\/\/answers.microsoft.com\/en-us\/msoffice\/forum\/all\/ms-access-cannot-compact-and-repair-database-and\/61e6d819-76ce-4abf-ac33-21cde8a9f62e\" target=\"_blank\" rel=\"noopener\">Compact and Repair might fail to work<\/a>.<\/p>\n<h2 style=\"text-align: left;\"><strong>Unique FAQs:<\/strong><\/h2>\n<h4 style=\"text-align: left;\"><strong>Can Access Error 49 Lead to Data Loss?<\/strong><\/h4>\n<p style=\"text-align: justify;\">No, error 49 can only disrupt the workflow, but it cannot directly lead to data loss or corruption.<\/p>\n<h4 style=\"text-align: left;\"><strong>Are There Tools Available for Automatically Detecting DLL Issues in Access?<\/strong><\/h4>\n<p style=\"text-align: justify;\">Yes, there are numerous tools available that can help you to identify and fix DLL-related glitches in Microsoft Access.<\/p>\n<h4 style=\"text-align: left;\"><strong>How Often Should I Update My DLLs to Avoid MS Access Error 49?<\/strong><\/h4>\n<p style=\"text-align: justify;\">You should regularly check for DLL updates and update as needed. This will help you to minimize the risk of compatibility issues.<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong>Also Read: <a href=\"https:\/\/www.accessrepairnrecovery.com\/blog\/fix-access-msain-dll-missing-error\">Fix \u201cCan\u2019t Find Language DLL msain.dll\u201d In MS Access<\/a><\/strong><\/p>\n<\/blockquote>\n<h2 style=\"text-align: left;\"><strong>Final Verdict<\/strong><\/h2>\n<p style=\"text-align: justify;\">Conquering <strong>bad DLL calling convention (error 49)<\/strong> is a challenging task if you are not a pro Access user. However, by following the step-by-step resolution specified in this blog, you can troubleshoot this problem and enjoy a seamless database experience.<\/p>\n<blockquote><p><strong>References:<\/strong><\/p><\/blockquote>\n<ul>\n<li><a href=\"https:\/\/learn.microsoft.com\/en-us\/office\/vba\/language\/reference\/user-interface-help\/bad-dll-calling-convention-error-49\" target=\"_blank\" rel=\"noopener\">https:\/\/learn.microsoft.com\/en-us\/office\/vba\/language\/reference\/user-interface-help\/bad-dll-calling-convention-error-49<\/a><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><div style='margin: 8px 0; clear: both;'><div style='border: 1px solid #e7e7e7; border-radius: 3px; background: #ffffff; color: #000; margin-top: 30px;'><div style='display: inline; background: #fff; padding: 10px; border: 1px solid #e7e7e7; border-bottom-right-radius: 10px; border-top-left-radius: 10px; border-top-right-radius: 10px; margin-left: -1px;'><img src='https:\/\/www.accessrepairnrecovery.com\/blog\/wp-content\/uploads\/2021\/12\/y-bulb.png' alt='tip' style='vertical-align: middle;' width='30px'><strong style='font-size: 18px; vertical-align: middle;'> Still having issues?<\/strong> Fix them with this Access repair tool: <\/div><div style='padding: 1rem; line-height: 1.6;'><p style='margin: 0; font-size: 17px;'>This software repairs & restores all ACCDB\/MDB objects including tables, reports, queries, records, forms, and indexes along with modules, macros, and other stuffs effectively.<\/p><div><ol style='font-size: 17px;'><li><strong><a href='https:\/\/www.accessrepairnrecovery.com\/blog\/get-access-file-repair-tool' target='_blank'>Download Stellar Repair for Access <\/a><\/strong> rated <i>Great<\/i> on Cnet (<i>download starts on this page<\/i>).<\/li><li>Click <strong>Browse<\/strong> and <strong>Search<\/strong> option to locate corrupt Access database.<\/li><li>Click <strong>Repair<\/strong> button to repair & preview the database objects.<\/li><\/ol><\/div><\/div><\/div><\/div>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Microsoft Access runtime error 49 bad DLL calling convention typically occurs when there is a mismatch in the calling convention &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Access Hacks: Conquer &#8220;Runtime Error 49 Bad DLL Calling Convention&#8221;!\" class=\"read-more button\" href=\"https:\/\/www.accessrepairnrecovery.com\/blog\/fix-access-bad-dll-calling-convention-error#more-63366\" aria-label=\"Read more about Access Hacks: Conquer &#8220;Runtime Error 49 Bad DLL Calling Convention&#8221;!\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":63370,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1021],"tags":[523,1753,1752],"class_list":["post-63366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fix-errors","tag-bad-dll-calling-convention-error-49","tag-ms-access-bad-dll-calling-convention","tag-vba-error-49-bad-dll-calling-convention","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Access Hacks: Conquer &quot;Runtime Error 49 Bad DLL Calling Convention&quot;!<\/title>\n<meta name=\"description\" content=\"Don&#039;t let runtime error 49 bad DLL calling convention hinder your progress, join us as we explore the solutions to conquer Access challenges.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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