\nscratch program<\/A>\nand make the following changes:\n<\/P>\n\n#define STRICT\n#include <windows.h>\n#include <windowsx.h>\n#include <ole2.h>\n#include <commctrl.h>\n#include <shlwapi.h>\n#include <stdio.h>\n#include <dwmapi.h><\/FONT><\/p>\nHINSTANCE g_hinst; \/* This application’s HINSTANCE *\/\nHWND g_hwndChild; \/* Optional child window *\/\nHTHUMBNAIL g_hthumb;<\/FONT><\/p>\nBOOL\nOnCreate(HWND hwnd, LPCREATESTRUCT lpcs)\n{\n DWM_THUMBNAIL_PROPERTIES props = {};\n HWND hwndTarget;\n if (sscanf(reinterpret_cast<PCSTR>(lpcs->lpCreateParams),\n “%p %ld %ld %ld %ld”, &hwndTarget,\n &props.rcSource.left, &props.rcSource.top,\n &props.rcSource.right, &props.rcSource.bottom) == 5) {\n DwmRegisterThumbnail(hwnd, hwndTarget, &g_hthumb);\n props.dwFlags = DWM_TNP_VISIBLE | DWM_TNP_RECTSOURCE |\n DWM_TNP_RECTDESTINATION;\n props.rcDestination = props.rcSource;\n OffsetRect(&props.rcSource,\n -props.rcSource.left, -props.rcSource.top);\n props.fVisible = TRUE;\n DwmUpdateThumbnailProperties(g_hthumb, &props);\n }<\/FONT>\n return TRUE;\n} <\/p>\nvoid\nOnDestroy(HWND hwnd)\n{\n if (g_hthumb) DwmUnregisterThumbnail(g_hthumb);<\/FONT>\n PostQuitMessage(0);\n}<\/p>\nint WINAPI WinMain(HINSTANCE hinst, HINSTANCE hinstPrev,\n LPSTR lpCmdLine, int nShowCmd)\n{\n …<\/p>\n
hwnd = CreateWindow(\n “Scratch”, \/* Class Name *\/\n “Scratch”, \/* Title *\/\n WS_OVERLAPPEDWINDOW, \/* Style *\/\n CW_USEDEFAULT, CW_USEDEFAULT, \/* Position *\/\n CW_USEDEFAULT, CW_USEDEFAULT, \/* Size *\/\n NULL, \/* Parent *\/\n NULL, \/* No menu *\/\n hinst, \/* Instance *\/\n lpCmdLine<\/FONT>);\n …\n}\n<\/PRE>\n\nOur Little Program passes its command line through to the\nWM_CREATE<\/CODE> message, which parses it as a\npointer (for Visual C++, a hex value with no 0x<\/CODE> prefix)\nand four integers representing the left, top, right, and bottom coordinates\na rectangle within that window.\n(For example, to get the upper left 100 pixels of the window,\npass 0 0 100 100<\/CODE>.)\nIt creates a thumbnail from that window and positions it inside\nthe scratch window.\n<\/P>\n\nUse Spy or whatever program to get a window handle and run the progarm\nwith the window handle and four integers (described above).\nA live slice of the window will appear in the scratch program.\n<\/P>\n
\nMaking it easier to select the target window and a rectangle from it\nis left as an exercise.\nThis is just a Little Program.\n<\/P><\/p>\n","protected":false},"excerpt":{"rendered":"
Today’s Little Program takes a rectangular portion of another application and continuously replicates it in its own client area. You might want to do this if you want to monitor a portion of an application like a custom progress bar, and the application doesn’t use the Windows 7 taskbar progress indicator feature. (Maybe it’s an old […]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[25],"class_list":["post-4393","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
Today’s Little Program takes a rectangular portion of another application and continuously replicates it in its own client area. You might want to do this if you want to monitor a portion of an application like a custom progress bar, and the application doesn’t use the Windows 7 taskbar progress indicator feature. (Maybe it’s an old […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/4393","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=4393"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/4393\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=4393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=4393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=4393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}