解释这段代码dst_band->RasterIO(GF_Write, 0, 0, quad1_scans, quad1_pixels, outarr[0], quad1_scans, quad1_pixels, GDT_Float32, 0, 0)
时间: 2024-06-12 22:07:08 浏览: 9
这段代码使用GDAL库中dst_band对象的RasterIO函数,将名为outarr的浮点型二维数组中的数据写入到一个GDAL数据集的一个波段中。具体来说,GF_Write参数表示这是一个写操作;0和0分别表示数据集的起始列和起始行;quad1_scans和quad1_pixels分别表示数据集的列数和行数;outarr[0]表示要写入的数据;GDT_Float32表示要写入的数据类型为32位浮点型;0和0表示输出数据的起始列和起始行,这里表示从第一列第一行开始写入。
相关问题
dst_band->RasterIO(GF_Write, 0, 0, quad1_scans, quad1_pixels, outarr[0], quad1_scans, quad1_pixels, GDT_Float32, 0, 0);
This line of code is using the RasterIO function to write data to a raster band in the destination dataset.
GF_Write: This is a flag indicating that we want to write data to the band.
0, 0: These are the starting pixel and line values in the band where we want to write the data.
quad1_scans, quad1_pixels: These are the width and height of the data we want to write (in pixels and lines).
outarr[0]: This is the array of data we want to write to the band. It must be the same size as quad1_scans * quad1_pixels.
quad1_scans, quad1_pixels: These are the width and height of the data we want to write (in pixels and lines).
GDT_Float32: This is the data type of the data we are writing. In this case, it is 32-bit floating point data.
0, 0: These are the x and y offsets in the source data where we want to start reading the data. Since we are writing data, these values are not used.
if( src_point != NULL ) { src_point[cd_make->dest_index].X = (int32_t)(dl_context.rect.width * cd_make->h_CP) + (int32_t)(((float32_t)dl_context.rect.width * dl_context.mesh_width * (float32_t)cd_make->h_count) + GRPH_CD_OFFSET_TO_ROUND); src_point[cd_make->dest_index].Y = (int32_t)((dl_context.rect.height * cd_make->v_CP) + ((uint32_t)GRPH_CD_MESH_HEIGHT_DEFAULT * cd_make->v_count)); } dest_point[cd_make->dest_index].X = (int32_t)((cd_make->pos[cd_make->pos_index].h_CP_position * GRPH_CD_DST_POINT_SCALE) + GRPH_CD_OFFSET_TO_ROUND); dest_point[cd_make->dest_index].Y = (int32_t)((cd_make->pos[cd_make->pos_index].v_CP_position * GRPH_CD_DST_POINT_SCALE) + GRPH_CD_OFFSET_TO_ROUND);错误为将基本类型的复合表达式转换为无符号的基本类型,修正
要修正错误,您可以将基本类型的复合表达式转换为无符号基本类型。在这种情况下,您可以使用类型转换操作符来执行转换。以下是修改后的代码示例:
```c
if (src_point != NULL) {
src_point[cd_make->dest_index].X = (int32_t)(dl_context.rect.width * cd_make->h_CP) +
(int32_t)(((float32_t)dl_context.rect.width * dl_context.mesh_width * (float32_t)cd_make->h_count) + (uint32_t)GRPH_CD_OFFSET_TO_ROUND);
src_point[cd_make->dest_index].Y = (int32_t)((dl_context.rect.height * cd_make->v_CP) + ((uint32_t)GRPH_CD_MESH_HEIGHT_DEFAULT * cd_make->v_count));
}
dest_point[cd_make->dest_index].X = (int32_t)((cd_make->pos[cd_make->pos_index].h_CP_position * GRPH_CD_DST_POINT_SCALE) + (uint32_t)GRPH_CD_OFFSET_TO_ROUND);
dest_point[cd_make->dest_index].Y = (int32_t)((cd_make->pos[cd_make->pos_index].v_CP_position * GRPH_CD_DST_POINT_SCALE) + (uint32_t)GRPH_CD_OFFSET_TO_ROUND);
```
在这里,我们使用 `(uint32_t)` 将 `GRPH_CD_OFFSET_TO_ROUND` 转换为无符号基本类型。这样就可以将结果赋给对应的变量,并修复了错误。
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