DDE代码
时间: 2023-07-02 12:04:02 浏览: 223
VB6 DDE 代码 ,测试绝对完善可用.rar
DDE(Dynamic Data Exchange)是一种在Windows操作系统中用于应用程序之间进行通信的机制。下面是一个简单的使用DDE进行通信的示例代码:
服务端代码:
```c++
#include <windows.h>
#include <iostream>
HDDEDATA CALLBACK DdeCallback(UINT uType, UINT uFmt, HCONV hconv, HSZ hsz1, HSZ hsz2, HDDEDATA hdata, DWORD dwData1, DWORD dwData2)
{
std::cout << "Received DDE message" << std::endl;
return NULL;
}
int main()
{
// 注册 DDE 服务名
HSZ hszServiceName = DdeCreateStringHandle(NULL, "MyDDEService", CP_WINANSI);
// 注册 DDE 数据项名
HSZ hszItemName = DdeCreateStringHandle(NULL, "MyDDEItem", CP_WINANSI);
// 注册 DDE 服务
HCONV hConv = DdeConnect(NULL, hszServiceName, hszItemName, NULL);
if (hConv == NULL)
{
std::cout << "Failed to connect to DDE service" << std::endl;
return 1;
}
// 注册 DDE 回调函数
DdeInitialize(&DdeCallback, APPCMD_CLIENTONLY, 0);
// 循环等待 DDE 请求
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
// 释放 DDE 字符串句柄
DdeFreeStringHandle(NULL, hszServiceName);
DdeFreeStringHandle(NULL, hszItemName);
return 0;
}
```
客户端代码:
```c++
#include <windows.h>
#include <iostream>
int main()
{
// 获取 DDE 服务名和数据项名
HSZ hszServiceName = DdeCreateStringHandle(NULL, "MyDDEService", CP_WINANSI);
HSZ hszItemName = DdeCreateStringHandle(NULL, "MyDDEItem", CP_WINANSI);
// 连接 DDE 服务
HCONV hConv = DdeConnect(NULL, hszServiceName, hszItemName, NULL);
if (hConv == NULL)
{
std::cout << "Failed to connect to DDE service" << std::endl;
return 1;
}
// 发送 DDE 请求
HSZ hszTopic = DdeCreateStringHandle(NULL, "System", CP_WINANSI);
HSZ hszItem = DdeCreateStringHandle(NULL, "UserName", CP_WINANSI);
HDDEDATA hData = DdeClientTransaction(NULL, 0, hConv, hszItem, CF_TEXT, XTYP_REQUEST, 5000, NULL);
if (hData == NULL)
{
std::cout << "Failed to send DDE request" << std::endl;
return 1;
}
// 获取 DDE 数据
char buffer[1024];
DdeGetData(hData, (unsigned char*)buffer, 1024, 0);
std::cout << "User name: " << buffer << std::endl;
// 释放 DDE 字符串句柄
DdeFreeStringHandle(NULL, hszServiceName);
DdeFreeStringHandle(NULL, hszItemName);
DdeFreeStringHandle(NULL, hszTopic);
DdeFreeStringHandle(NULL, hszItem);
return 0;
}
```
这个示例程序演示了一个简单的DDE通信过程,客户端应用程序向服务端应用程序发送一个DDE请求,服务端应用程序收到请求后输出一条消息。请注意,这只是一个简单的示例,实际的DDE通信可能需要更复杂的处理逻辑。
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