c# - How to handle Windows API LPTSTR output as a formal parameter output -

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i'm trying determine classname of window calling getclassname() on hwnd receive findwindowbycaption(). it's not working; see classname garbage characters (specifically, 4 question marks , strange non-alphanumeric character). getclassname(), far understand it, writes data caller's buffer.

here's code:

[dllimport("user32.dll", setlasterror = true)] static extern system.intptr findwindow(string lpclassname, string lpwindowname);  [dllimport("user32.dll", entrypoint = "findwindow", setlasterror = true)] static extern system.intptr findwindowbycaption(system.intptr zeroonly, string lpwindowname);  [dllimport("user32.dll")] static extern int getclassname(system.intptr hwnd,                                [param: marshalas(unmanagedtype.lptstr)]                                system.text.stringbuilder lpclassname, int nmaxcount);  ...  system.intptr hwndmywindow = findwindowbycaption(system.intptr.zero, "my window"); if (hwndmywindow != null) {    system.console.writeline("hwndmywindow = {0}", hwndmywindow);    system.text.stringbuilder lpclassname = new system.text.stringbuilder(256);    lpclassname.length = lpclassname.capacity - 2;    int len = getclassname(hwndmywindow, lpclassname, lpclassname.length - 2);    lpclassname.length = len; // set length actual length of classname    system.console.writeline("hwndmywindow = {0}, classname = {1}", hwndmywindow, lpclassname.tostring()); } else {    system.console.writeline("no such window."); }

what doing wrong? lpclassname param of getclassname() output... expected getclassname() write classname stringbuilder, it's not working right.

   [param: marshalas(unmanagedtype.lptstr)]

lptstr not mean think does. way wrote these declarations, unmanagedtype.lpstr can work. or better yet, omit attribute, not necessary @ all, pinvoke marshaller understands stringbuilder.

you invoking 1990s these declarations, using "ansi" versions of these winapi functions. default [dllimport] unfortunately. not make sense use them, nobody runs windows 98 anymore. windows unicode operating system @ heart, write declarations match:

    [dllimport("user32.dll", setlasterror = true, charset = charset.auto)]     static extern system.intptr findwindow(string lpclassname, string lpwindowname);      [dllimport("user32.dll", setlasterror = true, charset = charset.auto)]     static extern int getclassname(system.intptr hwnd,                                     stringbuilder lpclassname, int nmaxcount);

findwindowbycaption() bit cute, don't, pass null 1st argument. note have bug in error handling, findwindow fails intptr.zero, not null. , don't ignore error handling getclassname(). make loud bang throwing system.componentmodel.win32exception.


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