A DDE client application posts a WM_DDE_EXECUTE message to a DDE server application to send a string to the server to be processed as a series of commands. The server application is expected to post a WM_DDE_ACK message in response.
WM_DDE_EXECUTE wParam = (WPARAM) hwnd; // handle of posting application lParam = (LPARAM) hCommands; // handle to global object
The command string is a null-terminated string consisting of one or more opcode strings enclosed in single brackets ([ ]).
Each opcode string has the following syntax, where the parameters list is optional:
The opcode is any application-defined single token. It cannot include spaces, commas, parentheses, brackets, or quotation marks.
The parameters list can contain any application-defined value or values. Multiple parameters are separated by commas, and the entire parameter list is enclosed in parentheses. Parameters cannot include commas or parentheses except inside a quoted string. If a bracket or parenthesis character is to appear in a quoted string, it need not be doubled, as was the case under the old rules.
Following are some valid command strings:
[connect][download(query1,results.txt)][disconnect] [query("sales per employee for each district")] [open("sample.xlm")][run("r1c1")] [quote_case("This is a "" character")] [bracket_or_paren_case("()s or s should be no problem.")]
Note that, under the old rules, parentheses and brackets had to be doubled, as follows:
[bracket_or_paren_case("(())s or []s should be no problem.")]
Servers should be able to parse commands in either form.
The client application posts the WM_DDE_EXECUTE message by calling the PostMessage function, not the SendMessage function.
The client application allocates hCommands by calling the GlobalAlloc function with the GMEM_DDESHARE option.
The server application posts the WM_DDE_ACK message to respond positively or negatively. The server should reuse the hCommands object.
Unless specified otherwise by a sub-protocol, the server should not post the WM_DDE_ACK message until all the actions specified by the execute command string are completed. The one exception to this rule is when the string causes the server to terminate the conversation.
GlobalAlloc, IsWindowUnicode, PackDDElParam, PostMessage, ReuseDDElParam, SendMessage, UnpackDDElParam, WM_DDE_ACK
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