{"id":236,"date":"2009-10-11T17:05:40","date_gmt":"2009-10-11T11:35:40","guid":{"rendered":"http:\/\/live-42gears-site.pantheonsite.io\/blog\/?p=236"},"modified":"2023-01-04T05:52:53","modified_gmt":"2023-01-04T05:52:53","slug":"simulating-key-presses-with-keybd_event-function","status":"publish","type":"post","link":"https:\/\/www.42gears.com\/nl\/blog\/simulating-key-presses-with-keybd_event-function\/","title":{"rendered":"Simulating key presses in your program with keybd_event function"},"content":{"rendered":"

Out of need or curiosity you might want to know how to send key presses from your native application. The core of the solution involves calling keybd_event() function which has the following prototype.<\/p>\n

VOID keybd_event(BYTE bVk, BYTE bScan, DWORD dwFlags, DWORD dwExtraInfo);<\/em><\/p>\n

bVk is the virtual-key code of the character. bScan is the hardware scan code. dwFlags is an important field. If KEYEVENTF_KEYUP is specified in dwFlags field, the key is being released. If not specified, the key is being pressed.<\/p>\n

Here is a function which simulates pressing of alphanumeric characters. See winuser.h for all available virtual key codes.<\/p>\n

void SendStringKeys(char* pszChars)
\n{
\nwhile (*pszChars != NULL)
\n{
\nif ( (*pszChars >= ‘A’) && (*pszChars <= ‘Z’) )
\n\t\t\tkeybd_event(VK_SHIFT, 0, KEYEVENTF_SILENT, 0); <\/p>\n

\t\tkeybd_event(toupper(*pszChars), 0, KEYEVENTF_SILENT, 0);
\n\t\tkeybd_event(toupper(*pszChars), 0, KEYEVENTF_KEYUP|KEYEVENTF_SILENT, 0);<\/p>\n

\t\tif ( (*pszChars >= ‘A’) && (*pszChars <= ‘Z’) )
\n\t\t\tkeybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP|KEYEVENTF_SILENT, 0); <\/p>\n

\t\tpszChars++;
\n\t}
\n}<\/p><\/blockquote>\n

And here is an example of how to call SendStringKeys<\/em> function.<\/p>\n

int _tmain(int argc, _TCHAR* argv[])
\n{
\nSendStringKeys(“Hello World.”);
\nreturn 0;
\n}<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

Out of need or curiosity you might want to know how to send key presses from your native application. The core of the solution involves calling keybd_event() function which has the following prototype. VOID keybd_event(BYTE bVk, BYTE bScan, DWORD dwFlags, DWORD dwExtraInfo); bVk is the virtual-key code of the character. bScan is the hardware scan…<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[39,8,31],"tags":[54,47],"class_list":["post-236","post","type-post","status-publish","format-standard","hentry","category-development","category-general","category-windows-mobile","tag-programming","tag-windows-mobile"],"acf":[],"yoast_head":"\nSimulating key presses in your program with keybd_event function - 42Gears Mobility Systems<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.42gears.com\/blog\/simulating-key-presses-with-keybd_event-function\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Simulating key presses in your program with keybd_event function\" \/>\n<meta property=\"og:description\" content=\"Out of need or curiosity you might want to know how to send key presses from your native application. The core of the solution involves calling keybd_event() function which has the following prototype. 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