这段代码是什么意思

[gxx2019]

int iXOff, iYOff, iSample;

iSample = 0;

for( iYOff = 0; iYOff < nYSize; iYOff++ )
{
for( iXOff = 0; iXOff < nXSize; iXOff++ )
{
unsigned char *pabyData;

pabyData = pabySrc + iYOff * nLineOffset + iXOff * nPixelOffset;

if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 1 )
{
padfSamples[iSample++] = *pabyData;
}
else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 2 )
{
padfSamples[iSample++] = ((uint16 *) pabyData)[0];
}
else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 4 )
{
padfSamples[iSample++] = ((uint32 *) pabyData)[0];
}
else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 2 )
{
padfSamples[iSample++] = ((int16 *) pabyData)[0];
}
else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 32 )
{
padfSamples[iSample++] = ((int32 *) pabyData)[0];
}
else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 4 )
{
padfSamples[iSample++] = ((float *) pabyData)[0];
}
else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 8 )
{
padfSamples[iSample++] = ((double *) pabyData)[0];
}
}

pabySrc 是形参传过来的值，为unsigned char*，padfSamples为double*。(（xx*）pabyData)[0]是什么意思啊？

[zhangxfeng112]

[Quote=引用 3 楼 steven_007 的回复:]
padfSamples[iSample++] = ((double *) pabyData)[0];
pabyData 作为指针传给padfSamples[iSample++]

padfSamples 里面存放的是一个个地址。
[/Quote]

瞎扯蛋，无人子弟。

[t1397018]

(（xx*）pabyData)强制装换成xx形的指针

[zhangxfeng112]

padfSamples[iSample++] = ((double *) pabyData)[0];
这句话的意思是把pabyData指向的8个字节，当成一个double类型传给padfsamples[iSample]
然后iSample++;

[steven_007]

padfSamples[iSample++] = ((double *) pabyData)[0];
pabyData 作为指针传给padfSamples[iSample++]

padfSamples 里面存放的是一个个地址。

[猫已经找不回了]

padfSamples[iSample++] = ((uint16 *) pabyData)[0];

这种强制转换很多是不能成功的，得看编译器了。