在C++中读取bmp文件的宽和高,可以通过以下步骤实现:
ifstream
,打开bmp文件。#pragma pack(push, 1)
struct BMPFileHeader {
char signature[2];
uint32_t fileSize;
uint32_t reserved;
uint32_t dataOffset;
};
#pragma pack(pop)
#pragma pack(push, 1)
struct BMPInfoHeader {
uint32_t headerSize;
int32_t width;
int32_t height;
uint16_t planes;
uint16_t bitCount;
uint32_t compression;
uint32_t imageSize;
int32_t xPixelsPerMeter;
int32_t yPixelsPerMeter;
uint32_t colorsUsed;
uint32_t colorsImportant;
};
#pragma pack(pop)
width
和height
字段,即可获取bmp文件的宽和高。以下是一个示例代码,演示了如何读取bmp文件的宽和高:
#include <iostream>
#include <fstream>
#pragma pack(push, 1)
struct BMPFileHeader {
char signature[2];
uint32_t fileSize;
uint32_t reserved;
uint32_t dataOffset;
};
#pragma pack(pop)
#pragma pack(push, 1)
struct BMPInfoHeader {
uint32_t headerSize;
int32_t width;
int32_t height;
uint16_t planes;
uint16_t bitCount;
uint32_t compression;
uint32_t imageSize;
int32_t xPixelsPerMeter;
int32_t yPixelsPerMeter;
uint32_t colorsUsed;
uint32_t colorsImportant;
};
#pragma pack(pop)
int main() {
std::ifstream file("example.bmp", std::ios::binary);
if (!file) {
std::cout << "Failed to open bmp file." << std::endl;
return 1;
}
BMPFileHeader fileHeader;
BMPInfoHeader infoHeader;
file.read(reinterpret_cast<char*>(&fileHeader), sizeof(BMPFileHeader));
file.read(reinterpret_cast<char*>(&infoHeader), sizeof(BMPInfoHeader));
std::cout << "Width: " << infoHeader.width << std::endl;
std::cout << "Height: " << infoHeader.height << std::endl;
file.close();
return 0;
}
这段代码假设bmp文件名为"example.bmp",通过ifstream
打开文件,读取文件头和位图信息头,并输出宽和高。请注意,这只是一个简单的示例,实际应用中可能需要进行错误处理和更复杂的操作。
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