生成单通道bmp文件C语言代码

以下是生成单通道bmp文件的C语言代码：

#include <stdio.h>

#pragma pack(push, 1)
typedef struct {
    char signature[2];
    uint32_t fileSize;
    uint32_t reserved;
    uint32_t dataOffset;
} BMPFileHeader;

typedef struct {
    uint32_t headerSize;
    int32_t width;
    int32_t height;
    uint16_t planes;
    uint16_t bitsPerPixel;
    uint32_t compression;
    uint32_t imageSize;
    int32_t xPixelsPerMeter;
    int32_t yPixelsPerMeter;
    uint32_t numColors;
    uint32_t importantColors;
} BMPImageHeader;
#pragma pack(pop)

void generateBMP(char* filename, uint8_t* data, int width, int height) {
    BMPFileHeader fileHeader = {
        .signature = {'B', 'M'},
        .fileSize = sizeof(BMPFileHeader) + sizeof(BMPImageHeader) + width * height,
        .reserved = 0,
        .dataOffset = sizeof(BMPFileHeader) + sizeof(BMPImageHeader)
    };

    BMPImageHeader imageHeader = {
        .headerSize = sizeof(BMPImageHeader),
        .width = width,
        .height = height,
        .planes = 1,
        .bitsPerPixel = 8,
        .compression = 0,
        .imageSize = width * height,
        .xPixelsPerMeter = 0,
        .yPixelsPerMeter = 0,
        .numColors = 256,
        .importantColors = 0
    };

    FILE* file = fopen(filename, "wb");
    fwrite(&fileHeader, sizeof(fileHeader), 1, file);
    fwrite(&imageHeader, sizeof(imageHeader), 1, file);
    fwrite(data, sizeof(uint8_t), width * height, file);
    fclose(file);
}

int main() {
    // 生成一张100x100的单通道bmp图像，像素值为0
    uint8_t data[10000] = {0};
    generateBMP("test.bmp", data, 100, 100);
    return 0;
}

代码中使用了结构体来表示BMP文件头和图像头，这是因为BMP文件使用了特定的格式。在生成BMP文件时，先计算文件头和图像头的内容，然后将数据写入文件中即可。这里只生成了单通道BMP图像，即每个像素只有一个8位的灰度值，其他类型的BMP图像生成方式类似。