爱华网项目中遇到需要通过VC数据处理,并实时监测中间以及最终数据的方式,由于数据量大,并且现有的WINDOWS下现实界面都不能很好的实时显示.我在网上查了一下,发现WINDOWSDDE功能可能实现项目这个需求.
DDE,中文名叫动态数据交换,是基于WINDOWS系统开发的一种消息传输的通信方案.花了半天时间研究了下,做了个案例,VC6.0下调试通过.很开心.作为一个产品经理,为产品设计搭建好平台,有人的平台,有技术平台,一切目标为了高效的做好产品.
该C++案例如下:
// smdata.cpp : Defines the entry point for the consoleapplication.
//
#include "stdafx.h"
#include "windows.h"
#include <string.h>
#include "ddeml.h"
#include "stdio.h"
HDDEDATA CALLBACK DdeCallback(
UINTuType,// Transaction type.
UINTuFmt,// Clipboard data format.
HCONVhconv, //Handle to the conversation.
HSZhsz1,// Handle to a string.
HSZhsz2,// Handle to a string.
HDDEDATAhdata, // Handle to a global memory object.
DWORDdwData1, // Transaction-specific data.
DWORDdwData2) // Transaction-specific data.
{
return0;
}
void DDEExecute(DWORD idInst, HCONV hConv, char*szCommand)
{
HDDEDATAhData = DdeCreateDataHandle(idInst, (LPBYTE)szCommand,
lstrlen(szCommand)+1, 0, NULL, CF_TEXT, 0);
if(hData==NULL) {
printf("Command failed: %sn", szCommand);
}
else {
DdeClientTransaction((LPBYTE)hData, 0xFFFFFFFF, hConv, 0L, 0,
XTYP_EXECUTE, TIMEOUT_ASYNC, NULL);
}
}
void DDERequest(DWORD idInst, HCONV hConv, char* szItem, char*sDesc)
{
HSZ hszItem= DdeCreateStringHandle(idInst, szItem, 0);
HDDEDATAhData = DdeClientTransaction(NULL,0,hConv,hszItem,CF_TEXT,
XTYP_REQUEST,5000 , NULL);
if(hData==NULL)
{
printf("Request failed: %sn", szItem);
}
else
{
char szResult[255];
DdeGetData(hData, (unsigned char *)szResult, 255, 0);
printf("%s%sn", sDesc, szResult);
}
}
void DDEPoke(DWORD idInst, HCONV hConv, char* szItem, char*szData)
{
HSZ hszItem= DdeCreateStringHandle(idInst, szItem, 0);
DdeClientTransaction((LPBYTE)szData,(DWORD)(lstrlen(szData)+1),
hConv, hszItem, CF_TEXT,
XTYP_POKE, 3000, NULL);
DdeFreeStringHandle(idInst, hszItem);
}
int main(int argc, char* argv[])
{
char szApp[]= "EXCEL";
charszTopic[] = "C:\Test.xls";
//charszTopic[] = "E:\projectaTouchsoftwaretmpTest.xls";
charszCmd1[] = "[APP.MINIMIZE()]";
charszItem1[] = "R1C1"; char szDesc1[] = "A1Contains: ";
charszItem2[] = "R2C1"; char szDesc2[] = "A2Contains: ";
charszItem3[] = "R3C1"; char szData3[] = "Data fromDDE Client";
charszItem4[] = "R3C1"; char szData4[] = "HelloWorld!";
charszItem5[] = "R3C1"; char szData5[16] = "0";
//charszCmd2[] ="[SELECT("R3C1")][FONT.PROPERTIES(,"Bold")][SAVE()][QUIT()]";
charszCmd2[] = "[SELECT("R3C1")][FONT.PROPERTIES(,"Bold")]";
charszCmd3[] = "[SELECT("R3C1")][FONT.PROPERTIES(,"Bold")]";
int i,j,k;
char string[16];
//DDEInitialization
DWORDidInst=0;
UINTiReturn;
iReturn =DdeInitialize(&idInst,(PFNCALLBACK)DdeCallback,
APPCLASS_STANDARD | APPCMD_CLIENTONLY, 0 );
if(iReturn!=DMLERR_NO_ERROR)
{
printf("DDE Initialization Failed: 0xxn", iReturn);
Sleep(1500);
return 0;
}
//StartDDE Server and wait for it to become idle.
HINSTANCEhRet = ShellExecute(0, "open", szTopic, 0, 0, SW_SHOWNORMAL);
if((int)hRet < 33)
{
printf("Unable to Start DDE Server: 0xxn", hRet);
Sleep(1500); DdeUninitialize(idInst);
return 0;
}
Sleep(1000);
//DDEConnect to Server using given AppName and topic.
HSZ hszApp,hszTopic;
HCONVhConv;
hszApp =DdeCreateStringHandle(idInst, szApp, 0);
hszTopic =DdeCreateStringHandle(idInst, szTopic, 0);
hConv =DdeConnect(idInst, hszApp, hszTopic, NULL);
DdeFreeStringHandle(idInst, hszApp);
DdeFreeStringHandle(idInst, hszTopic);
if (hConv ==NULL)
{
printf("DDE Connection Failed.n");
Sleep(1500); DdeUninitialize(idInst);
return 0;
}
//Executecommands/requests specific to the DDE Server.
DDEExecute(idInst, hConv, szCmd1);
DDERequest(idInst, hConv, szItem1, szDesc1);
DDERequest(idInst, hConv, szItem2, szDesc2);
DDEPoke(idInst, hConv, szItem3, szData3);
DDEExecute(idInst, hConv, szCmd2);
for(i=0;i<65536;i++){for(j=0;j<1000;j++){;}}
DDEPoke(idInst, hConv, szItem4, szData4);
DDEExecute(idInst, hConv, szCmd3);
for(i=0;i<65536;i++){for(j=0;j<1000;j++){;}}
for(k=0;k<20;k++) {
itoa(k, string, 10);
printf("%s n", string);
strcpy(szData5, string);
DDEPoke(idInst, hConv, szItem5,szData5);
DDEExecute(idInst, hConv,szCmd3);
for(i=0;i<65536;i++){for(j=0;j<1000;j++){;}}
}
//DDEDisconnect and Uninitialize.
DdeDisconnect(hConv);
DdeUninitialize(idInst);
Sleep(3000);
return1;
}
