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CONVCONTEXT structure (ddeml.h)

Contains information supplied by a Dynamic Data Exchange (DDE) client application. The information is useful for specialized or cross-language DDE conversations.

Syntax

typedef struct tagCONVCONTEXT {
 UINT cb;
 UINT wFlags;
 UINT wCountryID;
 int iCodePage;
 DWORD dwLangID;
 DWORD dwSecurity;
 SECURITY_QUALITY_OF_SERVICE qos;
} CONVCONTEXT, *PCONVCONTEXT;

Members

cb

Type: UINT

The structure's size, in bytes.

wFlags

Type: UINT

The conversation context flags. Currently, no flags are defined for this member.

wCountryID

Type: UINT

The country/region code identifier for topic-name and item-name strings.

iCodePage

Type: int

The code page for topic-name and item-name strings. Non-multilingual clients should set this member to CP_WINANSI. Unicode clients should set this value to CP_WINUNICODE.

dwLangID

Type: DWORD

The language identifier for topic-name and item-name strings.

dwSecurity

Type: DWORD

A private (application-defined) security code.

qos

Type: SECURITY_QUALITY_OF_SERVICE

The quality of service a DDE client wants from the system during a given conversation. The quality of service level specified lasts for the duration of the conversation. It cannot be changed once the conversation is started.

Remarks

Security Warning

For added security, your application can specify a security code with the dwSecurity member. The application could then examine this value in the DdeCallback function to check the identity of the client application. However, a value that is hard-coded into an application might be discovered. Thus, you may want to provide the security code in some other way, such as through user input.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Header ddeml.h (include Windows.h)

See also

Dynamic Data Exchange Management Library

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