c语言扫描二维码，C语言实现二维码扫描功能

要实现C语言扫描二维码的功能，可以使用开源库zxing（Zebra Crossing SDK）。以下是一个简单的示例代码：

```c

#include

int main() {

// 初始化ZXing库

if (init_barcode_detector(&barcode_detector, NULL) != ZXING_OK) {

printf("无法初始化ZXing库

");

return -1;

}

// 创建二维码图像文件

FILE *fp = fopen("qrcode.png", "wb");

if (fp == NULL) {

printf("无法创建二维码图像文件

");

return -1;

}

// 设置二维码图像文件的宽度和高度

fwrite(("QRCODE", 3), sizeof(char), 1, fp);

fwrite(("WIDTH=200", 11), sizeof(char), 1, fp);

fwrite(("HEIGHT=200", 11), sizeof(char), 1, fp);

fwrite(("TYPE=RGBQUAD", 11), sizeof(char), 1, fp);

fwrite(("COLORSPACE=DeviceGray", 11), sizeof(char), 1, fp);

fwrite(("FILTER=AllColor", 11), sizeof(char), 1, fp);

fwrite(("SUBMAP=PNG8-24", 11), sizeof(char), 1, fp);

fwrite(("SAMPLESIZE=8", 11), sizeof(char), 1, fp);

fwrite(("COLORMODE=RGB", 11), sizeof(char), 1, fp);

fwrite(("CHARSET=UTF-8", 11), sizeof(char), 1, fp);

fwrite(("ERROR_CORRECTAHDR=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_DISCONNECTED=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_ENCODING=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_EXPIRED=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_INVALID_CHARSET=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_LOST_SYNC=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_NEGATIVE_COUNT=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_PARSE_ERROR=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_READ_ERROR=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_CHARACTER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_CHARACTER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_ENTITY=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_ENTITY=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_STRING=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_STRING=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_VALUE=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VALUE=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_VERSION=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VERSION=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_VERSION_NUMBER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VERSION_NUMBER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_VERSION_STRING=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VERSION_STRING=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNKNOWN_VERSION_STRING_NUMBER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VERSION_STRING_NUMBER=0", 11), sizeof(char), 1, fp);

fwrite(("ERROR_UNEXPECTED_VERSION_STRING_STRING=0", 11), sizeof(char), 1, fp);

fclose(fp);

// 读取二维码图像文件

FILE *fp2 = fopen("qrcode.png", "rb");

if (fp2 == NULL) {

printf("无法读取二维码图像文件

");

return -1;

}

// 获取二维码图像文件的宽度和高度

fseek(fp2, 0, SEEK_END);

int width = ftell(fp2);

fseek(fp2, 0, SEEK_SET);

int height = fread(reinterpret_cast(void *)&width, sizeof(int), 1, fp2);

fclose(fp2);

// 创建二维码图像文件的内存缓冲区

unsigned char buffer[width * height];

if (buffer == NULL) {

printf("无法创建二维码图像文件的内存缓冲区

");

return -1;

}

// 读取二维码图像文件的数据到内存缓冲区

fseek(fp2, 0, SEEK_SET);

fread(buffer, sizeof(unsigned char), width * height, fp2);

fclose(fp2);

// 使用zxing库解析二维码图像文件

ZXingError err = zxing::Decoder::getInstance()->decode(buffer, barcode_detector);

if (err != ZXing::OK) {

printf("无法解析二维码图像文件

");

return -1;

}

// 输出二维码图像文件的相关信息

printf("二维码图像文件的宽度: %d

", width);

printf("二维码图像文件的高度: %d

", height);

printf("二维码图像文件的版本号: %s