In developing DDE with MFC (DDEML), encounter a confusing problem, some commands provided by DDEML, run normal in the clock function or button event, but running in the thread, the following error:
"A parameter failed to be validated by the ddeml."
Below is two code:
// Clock Void Yd :: TimerProc (long hwnd, long nidevent, long uLapse, long lptimerfunc) {cstring strdata; static aaaa = 0; if (aaa.g_connection) {strdata.format ("T% D", AAAA ); AAA.G_Connection-> Advise ("AAA", (CHAR *) (const char *) strdata);}}
// Thread Uint Yd :: YFDDE (LPVOID PPARAM) {cstring strdata; static aaaa = 0;
While (1) {if (aaa.g_connection) {stradata.format ("% D", AAAA ); AAA.G_Connection-> Advise ("AAA", (CHAR *) STRDATA);
Sleep (3000);}}} Return 0;
The thread and the clock code are exactly the same, but the result is different, it is difficult to have special restrictions on DDLML? This is the reason for MSDN:
The application used a data handle initialized with a different item name handle Than Was Required by The Transaction.
.....................
The Application Used A Client-Side Conversation Handle with a Server-Side Function Or Vice Versa.
The Application Used A Freed Data Handle or String Handle.
More Than One Instance of the Application Used The Same Object.
I haven't figured out what it means.
By the way, who knows that Houjie teacher's "Windows DDE Dynamic Information Exchange" electronic version of the book is downloaded?
