marshalling - c# using SetClipboardData fail with ERROR_INVALID_HANDLE -

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when try set string clipboard native method setclipboarddata. fails , error code 6 error_invalid_handle getlasterror() method. can not find out how fails, here code:

                string copymessage = "need copy clipboard";                 const int gmem_movable = 0x0002;                 const int ghnd = gmem_movable;                  uint format;                 uint bytes;                 intptr hglobal = intptr.zero;                 format = cf_unicodetext;                  byte[] copymessagebytes = encoding.unicode.getbytes(copymessage + "\0");                  // important: setclipboarddata requires memory acquired globalalloc using gmem_movable.                 hglobal = globalalloc(ghnd, (uintptr)copymessagebytes.length);                 if (hglobal == intptr.zero)                 {                     return false;                 }                 marshal.copy(copymessagebytes, 0, hglobal, copymessagebytes.length);                  if (setclipboarddata(format, hglobal).toint64() != 0) // code fails here                 {                     // important: setclipboarddata takes ownership of hglobal upon success.                     hglobal = intptr.zero;                 }                 else                 {                     return false;                 }

i use marshal.copy(byte[] source, int startindex, intptr destination, int length) copy bytes hglobal , right? in case, dose must use native method copymemory() this? why?

thx

i found how fix it. because alloc memory globalalloc(), need call globallock() before copy data, need call globalunlock() after copy.


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