c语言 pdf转图片

以下是使用ImageMagick将PDF转换为图片的C语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <wand/MagickWand.h>

int main(int argc, char **argv)
{
    MagickWand *magick_wand;
    MagickBooleanType status;
    MagickPixelPacket pixel;
    PixelIterator *iterator;
    ExceptionInfo *exception;
    char *pdf_file = "example.pdf";
    char *image_file = "example.jpg";
    int width, height;

    MagickWandGenesis();

    exception = AcquireExceptionInfo();
    magick_wand = NewMagickWand();

    status = MagickReadImage(magick_wand, pdf_file);
    if (status == MagickFalse) {
        CatchException(exception);
        fprintf(stderr, "Failed to read PDF file %s\n", pdf_file);
        return 1;
    }

    MagickResetIterator(magick_wand);
    iterator = NewPixelIterator(magick_wand);
    width = MagickGetImageWidth(magick_wand);
    height = MagickGetImageHeight(magick_wand);

    for (int y = 0; y < height; y++) {
        PixelWand **pixels = PixelGetNextIteratorRow(iterator, &width);
        for (int x = 0; x < width; x++) {
            PixelGetMagickColor(pixels[x], &pixel);
            // Do something with the pixel color
        }
        PixelSyncIterator(iterator);
    }

    status = MagickWriteImage(magick_wand, image_file);
    if (status == MagickFalse) {
        CatchException(exception);
        fprintf(stderr, "Failed to write image file %s\n", image_file);
        return 1;
    }

    magick_wand = DestroyMagickWand(magick_wand);
    exception = DestroyExceptionInfo(exception);
    MagickWandTerminus();

    return 0;
}

上述代码使用ImageMagick的MagickWand API读取PDF文件并将其转换为JPEG格式的图像。你可以根据需要更改输出图像的格式。请注意，你需要安装ImageMagick库和开发文件才能编译此代码。