fseek(fp, 1078 + (bmh.biHeight - i - 1) * GET_ALIGN(bmh.biWidth), SEEK_SET);
时间: 2024-05-20 13:16:38 浏览: 12
This line of code seeks to a specific position in a file pointed to by the file pointer 'fp'. The position is calculated using the following formula:
1078 + (bmh.biHeight - i - 1) * GET_ALIGN(bmh.biWidth)
Here, 'bmh' is a struct representing a bitmap image header, and 'i' is an index variable used in a loop. The 'GET_ALIGN' macro is used to calculate the number of bytes needed to align each row of the image data to a 4-byte boundary.
The formula calculates the byte position in the file where the image data for a particular row should begin. The file pointer is then moved to this position using the 'fseek' function, with the 'SEEK_SET' parameter indicating that the position is relative to the beginning of the file. This allows the program to read or write the image data for that row at the correct position in the file.
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