绘制曲线的c脚本如下
for( i =0; i <= 23; i++ )
{
// Fill data pair with data from X and Y value list
vtDataX.vt = VT_I2;
vtDataX.u.iVal = X_Values[i]; // X-value
vtDataY.vt = VT_I2;
vtDataY.u.iVal = Y_Values[i]; // Y-value

// Set “DataX” property of X-axis
PDLRTSetPropEx( PDLRT_AM_DEFAULT, lpszPictureName, "TrendYX1", "DataX",
VT_VARIANT, (void*)&vtDataX, NULL, NULL, 0, NULL, NULL );

// Set “DataY” property of Y-axis
PDLRTSetPropEx( PDLRT_AM_DEFAULT, lpszPictureName, "TrendYX1", "DataY",
VT_VARIANT, (void*)&vtDataY, NULL, NULL, 0, NULL, NULL );

// Insert X/Y values
SetPropBOOL( lpszPictureName, "TrendYX1", "InsertData", TRUE );

VariantClear( &vtDataX );
VariantClear( &vtDataY );
}
已将X_Values[]和Y_Values[]两个数组改成float型，可控件显示的对应点还是整数。编译时如下语句出现警告：

vtDataX.u.iVal = X_Values[i]; // X-value
vtDataY.u.iVal = Y_Values[i]; // Y-value

警告内容：conversion may loose information
请问是怎么回事，如何将float型的变量传到功能曲线控件中显示？