我在做一个画面，画面中有一个下接框，一个列表控件，一个趋势曲线控件，一个按钮。
列表和曲线控件组态的变量是一致的，但列表和曲线控件不同时显示出来，按钮用来切换显示列表或曲线。
我的想法是打开该画面时，将列表控件所组态的列名称填充到下拉框控件的列项中去，代码如下。
现在问题是打开该画面时，有时候能够成功填充下拉框，有时候不能填充，没有什么规律。
请各位兄弟给个建议。
//
#include "apdefap.h"
void OnOpenPicture(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName)
{
#pragma option(mbcs)

#define GetObjectA GetObject

int iListCount, iListIndex;
char *strLable;
int i;
BOOL bTrendDis;

__object *pdl=NULL;
__object *pic=NULL;
__object *obj=NULL;

bTrendDis = GetTagBitWait("bTableDisplay");
if(!bTrendDis)
{
pdl = __object_create("PDLRuntime");
if(!pdl)
{
printf("Open pdl = NULL\r\n");
return;
}

pic = pdl->GetPicture("pMain.pMainArea:pTableAndTrend");
if( pic == NULL)
{
__object_delete(pdl);
printf("Open pic = NULL\r\n");
return;
}
//cb2是一个S7flatDropDown控件
obj = pic->GetObject("cb2");
if( obj == NULL)
{
__object_delete(pic);
__object_delete(pdl);
printf("Open obj = NULL\r\n");
return;
}

// obj->Clear( );
//iTrendNo是一个内部变量，表示当前要显示的趋势曲线序号
iListIndex = GetTagSDWordWait("iTrendNo");
//cb3是一个表格控件
iListCount = GetPropWord(lpszPictureName,"cb3","NumItems");

if(iListIndex >= iListCount)
iListIndex = 0;

for(i = 0; i {
SetPropWord(lpszPictureName,"cb3","Index",i);
strLable = GetPropChar(lpszPictureName,"cb3","Name");
printf("Open Picture The Lable is: %s \r\n",strLable);

//cb4是一个趋势曲线控件
SetPropWord(lpszPictureName,"cb4","Index",i);
if(i == iListIndex)
{
SetPropBOOL(lpszPictureName,"cb4","ItemVisible",TRUE);
SetPropChar(lpszPictureName,"cb4","Label",strLable);
}
else
SetPropBOOL(lpszPictureName,"cb4","ItemVisible",FALSE);

obj->AddItem(strLable,i);
}

SetPropWord(lpszPictureName,"cb2","ListIndex",iListIndex);

SetPropWord(lpszPictureName,"cb4","Index",iListIndex);
SetPropChar(lpszPictureName,"cb4","Command","Reload");

printf( "Open Picture iTrendNo is: %d \r\n", iListIndex );
printf( "Open Picture cb3->NumItems is: %d \r\n", iListCount );

iListCount = GetPropWord(lpszPictureName,"cb2","ListCount");
printf( "Open Picture cb2->iListCount is: %d \r\n", iListCount );

__object_delete(obj);
__object_delete(pic);
__object_delete(pdl);
}
}