c# - Bitmap.Save the whole mage is black, not just the background -


this question has answer here:

i taking screenshot of external application printwindow , want save desktop.

this code :

// proc             process proc = process.getprocessesbyname("procname").single();             intptr hwnd = proc.mainwindowhandle;              // restore proc if minimised             int style = getwindowlong(hwnd, gwl_style);             if ((style & ws_minimize) == ws_minimize)                 showwindow(hwnd, windowshowstyle.restore);              // rect             rect rect;             getwindowrect(new handleref(this, hwnd), out rect);              // screenshot             int width = rect.right - rect.left;             int height = rect.bottom - rect.top;             bitmap bmp = new bitmap(width, height);             using (graphics g = graphics.fromimage(bmp))             {                 intptr dc = g.gethdc();                  if (!printwindow(hwnd, dc, 0))                 {                     int error = marshal.getlastwin32error();                     var exception = new system.componentmodel.win32exception(error);                     debug.writeline("error: " + error + ": " + exception.message);                     return;                 }                  //thread.sleep(200);                 bmp.save(environment.getfolderpath(environment.specialfolder.desktop) + @"\test.jpeg", imageformat.jpeg);                 panel1.backgroundimage = bmp;                 g.releasehdc(dc);             }

the panel1 shows me image, actual screenshot of application. when go desktop, find test.jpeg it's black. why?

thanks !

i have successed @ saving .jpg changing code become :

// screenshot             int width = rect.right - rect.left;             int height = rect.bottom - rect.top;             bitmap bmp = new bitmap(width, height, pixelformat.format24bpprgb);             using (graphics g = graphics.fromimage(bmp))             {                 g.clear(color.white);                 intptr dc = g.gethdc();                  if (!printwindow(hwnd, dc, 0))                 {                     int error = marshal.getlastwin32error();                     var exception = new system.componentmodel.win32exception(error);                     debug.writeline("error: " + error + ": " + exception.message);                     return;                 }                  g.releasehdc(dc);             }              // save screenshot             bmp.save(environment.getfolderpath(environment.specialfolder.desktop) + @"\test.jpg", imageformat.jpeg);             panel1.backgroundimage = bmp;

Comments

Post a Comment

Popular posts from this blog

jOOQ update returning clause with Oracle -

according http://www.jooq.org/doc/3.8/manual/sql-building/sql-statements/update-statement/ jooq doesn't support returning clause in update statements databases except firebird , postgres. does know, still correct oracle jooq? according oracle's documentation, oracle db supports returning clase delete, insert, or update statements. incorrect manual you're right - manual wrong , should fixed: https://github.com/jooq/jooq/issues/5470 single row update returning jooq 3.8 added support single row update .. returning statements. internally, uses callablestatement , pl/sql block of form: begin update "my_table" set "my_table"."column" = 'xyz' "my_table"."id" = 1 returning "my_table"."id", "my_table"."column" ?, ?; ? := sql%rowcount; end; the relevant issue is: https://github.com/jooq/jooq/issues/5190 multi row update returning a...
Read more

java - Warning equals/hashCode on @Data annotation lombok with inheritance -

i have entity inherits other. on other hand, i'm using lombok project reduce boilerplate code, put @data annotation. annotation @data inheritance produces next warning: generating equals/hashcode implementation without call superclass, though class not extend java.lang.object. if intentional, add '@equalsandhashcode(callsuper=false)' type. is advisable add annotation @equalsandhashcode (callsuper = true) or @equalsandhashcode (callsuper = false) ? if not added, 1 callsuper=false or callsuper=true ? the default value false . 1 if don't specify , ignore warning. yes, recommended add @equalsandhashcode annotation on @data annotated classes extend else object. cannot tell if need true or false , depends on class hierarchy, , need examined on case-by-case basis. however, project or package, can configure in lombok.config call super methods if not direct subclass of object. lombok.equalsandhashcode.callsuper = call for configuration system ...
Read more

java - BasicPathUsageException: Cannot join to attribute of basic type -

i using java 8 jpa (hibernate 5.2.1). have clause works perfectly, until introduce clause make use foreign key table values too. i getting following error: basicpathusageexception: cannot join attribute of basic type i think problem related fact have join table, , not sure how create join using join table. employee - employee_category - category model (employee.java): @manytomany(cascade = cascadetype.all, fetch=fetchtype.eager) @jointable ( name="employee_category", joincolumns={ @joincolumn(name="emp_id", referencedcolumnname="id") }, inversejoincolumns={ @joincolumn(name="cat_id", referencedcolumnname="id") } ) private set<category> categories; model (category.java): @id private string id; jpa when introduce following code, fails error above (i think problem new piece of code): join<t, category> category = from.join("id"); predicates.add(criteriabuilder.like(category....
Read more