C++读取 .dbf和.sbn、shx sho abx文件 加水印 输出到其他文件中

读取 .dbf 文件可以使用 DBF 文件的开源库，例如 Dbasepp 或者 libdbf++。读取 .sbn、.shx、.sho、.abx 文件可以使用 ESRI Shapefile 的开源库，例如 GDAL 或者 shapelib。

加水印需要先在要输出的文件中插入水印，可以使用开源的图像处理库，例如 OpenCV。将水印作为图像，先读入要输出的文件，然后在图像上叠加水印，最后将加了水印的图像输出到文件中。

下面是一个简单的示例代码，仅供参考：

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include "dbf.h"
#include "shapefil.h"
#include "opencv2/opencv.hpp"

using namespace std;
using namespace cv;

int main()
{
    // 读取.dbf文件
    DBFHandle dbf = DBFOpen("data.dbf", "rb");
    if (dbf == nullptr) {
        cerr << "Failed to open data.dbf." << endl;
        return -1;
    }

    int recordCount = DBFGetRecordCount(dbf);
    int fieldCount = DBFGetFieldCount(dbf);

    // 读取.shp文件
    SHPHandle shp = SHPOpen("data.shp", "rb");
    if (shp == nullptr) {
        cerr << "Failed to open data.shp." << endl;
        return -1;
    }

    int shapeType;
    int shapeCount;
    double minBound[4], maxBound[4];

    SHPGetInfo(shp, &shapeCount, &shapeType, minBound, maxBound);

    // 读取水印图像
    Mat watermark = imread("watermark.png", IMREAD_UNCHANGED);
    if (watermark.empty()) {
        cerr << "Failed to open watermark.png." << endl;
        return -1;
    }

    // 创建输出文件
    SHPHandle outShp = SHPCreate("output.shp", shapeType);
    DBFHandle outDbf = DBFCreate("output.dbf");

    // 复制.dbf文件的schema
    for (int i = 0; i < fieldCount; i++) {
        char fieldName[12];
        int fieldType, fieldWidth, fieldDecimals;
        fieldType = DBFGetFieldInfo(dbf, i, fieldName, &fieldWidth, &fieldDecimals);
        DBFAddField(outDbf, fieldName, fieldType, fieldWidth, fieldDecimals);
    }

    // 复制.shp文件的geometry
    vector<SHPObject*> shapes;
    for (int i = 0; i < shapeCount; i++) {
        SHPObject* shape = SHPReadObject(shp, i);
        shapes.push_back(shape);
    }

    // 在每个geometry上加水印
    for (int i = 0; i < shapeCount; i++) {
        SHPObject* shape = shapes[i];

        // 读取geometry的bounding box
        double xMin = shape->dfXMin;
        double yMin = shape->dfYMin;
        double xMax = shape->dfXMax;
        double yMax = shape->dfYMax;

        // 在bounding box中心位置叠加水印
        Point2d center((xMin + xMax) / 2, (yMin + yMax) / 2);
        Point2d topLeft(center.x - watermark.cols / 2, center.y - watermark.rows / 2);
        Point2d bottomRight(center.x + watermark.cols / 2, center.y + watermark.rows / 2);

        // 将geometry转换为OpenCV的轮廓
        vector<Point> points;
        for (int j = 0; j < shape->nVertices; j++) {
            double x = shape->padfX[j];
            double y = shape->padfY[j];
            Point pt(x, y);
            points.push_back(pt);
        }
        vector<vector<Point>> contours;
        contours.push_back(points);

        // 创建mask
        Mat mask = Mat::zeros(watermark.size(), CV_8UC1);
        fillPoly(mask, contours, Scalar(255));

        // 叠加水印
        Mat image = imread("data.png", IMREAD_UNCHANGED);
        Mat roi = image(Rect(topLeft, bottomRight));
        Mat maskedWatermark;
        watermark.convertTo(maskedWatermark, CV_8UC4, 255);
        vector<Mat> channels;
        split(maskedWatermark, channels);
        channels[3] = mask;
        merge(channels, maskedWatermark);
        addWeighted(roi, 1, maskedWatermark, 0.5, 0, roi);

        // 将加了水印的geometry写入输出文件
        SHPObject* outShape = SHPCreateSimpleObject(shapeType, shape->nVertices, shape->padfX, shape->padfY, nullptr);
        DBFWriteIntegerAttribute(outDbf, i, 0, DBFReadIntegerAttribute(dbf, i, 0)); // 复制第一个字段（ID）
        for (int j = 1; j < fieldCount; j++) {
            DBFFieldType fieldType = DBFGetFieldInfo(dbf, j, nullptr, nullptr, nullptr);
            if (fieldType == FTDouble) {
                DBFWriteDoubleAttribute(outDbf, i, j, DBFReadDoubleAttribute(dbf, i, j));
            }
            else if (fieldType == FTInteger) {
                DBFWriteIntegerAttribute(outDbf, i, j, DBFReadIntegerAttribute(dbf, i, j));
            }
            else {
                DBFWriteStringAttribute(outDbf, i, j, DBFReadStringAttribute(dbf, i, j));
            }
        }
        SHPWriteObject(outShp, -1, outShape);
        SHPDestroyObject(outShape);
    }

    // 关闭所有文件
    SHPClose(shp);
    DBFClose(dbf);
    SHPClose(outShp);
    DBFClose(outDbf);

    return 0;
}

需要注意的是，上述示例代码仅支持点、线、面三种类型的geometry，如果要支持更多的geometry类型，需要根据实际情况修改代码。此外，示例代码中使用的水印是一个透明的PNG图像，如果要使用其他类型的水印，需要相应地修改代码。