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2026-06-18

从字库中识别文字 - OcrFromDictPtr ​

函数简介 ​

从字库中识别指定图片的文字，需提前加载数据库。支持多个字库同时识别，多个字库用 \| 分割，如 dict1\|dict2。

接口名称 ​

OcrFromDictPtr

DLL调用 ​

long OcrFromDictPtr(long instance, long ptr, string colorJson, string dict_name, double matchVal);

参数说明 ​

参数名类型说明
instance长整数型OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
ptr长整数型图像指针。
colorJson字符串颜色模型配置字符串，用于限定图像匹配中的颜色范围，格式说明见 颜色模型说明 - ColorModel。JSON格式示例：[{"StartColor":"3278FA","EndColor":"6496FF","Type":0}]；简化格式示例：`3278FA-000000。
dict_name字符串字库名称，为空时搜索所有字库；多个字库用 | 分割，如 dict1|dict2
matchVal双精度浮点数匹配值。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
std::string result = ola.OcrFromDictPtr(0, "value", "num", 0.9);
csharp
using OLAPlug;

var ola = new OLAPlugServer();
string result = ola.OcrFromDictPtr(0, "value", "num", 0.9);
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
result = ola.OcrFromDictPtr(0, "value", "num", 0.9)
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
String result = ola.OcrFromDictPtr(0, "value", "num", 0.9);
cpp
var ola = com("OlaPlug.OlaSoft")
var result = ola.OcrFromDictPtr(0, "value", "num", 0.9)
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
result = ola.OcrFromDictPtr(0, "value", "num", 0.9)
text
.局部变量 ola, OLAPlug
ola.创建 ()
result ＝ ola.OcrFromDictPtr(0, “value”, “num”, 0.9)
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var result = ola.OcrFromDictPtr(0, "value", "num", 0.9);
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
文本型 result = ola.OcrFromDictPtr(0, "value", "num", 0.9)
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
std::string result = ola.OcrFromDictPtr(0, "value", "num", 0.9);

原生 DLL 调用 ​

cpp
long instance = CreateCOLAPlugInterFace();
long ptr = OcrFromDictPtr(instance, 0, "value", "num", 0.9);
if (ptr != 0) {
    char buffer[512] = {0};
    GetStringFromPtr(ptr, buffer, sizeof(buffer));
    FreeStringPtr(ptr);
}
csharp
using System.Runtime.InteropServices;
using System.Text;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long CreateCOLAPlugInterFace();
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int GetStringFromPtr(long ptr, StringBuilder lpString, int size);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int FreeStringPtr(long ptr);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int GetStringSize(long ptr);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long OcrFromDictPtr(long ola, long ptr, string colorJson, string dict_name, int matchVal);

long instance = CreateCOLAPlugInterFace();
long ptr = OcrFromDictPtr(instance, 0, "value", "num", 0.9);
if (ptr != 0) {
    StringBuilder sb = new StringBuilder(GetStringSize(ptr) + 1);
    GetStringFromPtr(ptr, sb, sb.Capacity);
    FreeStringPtr(ptr);
    string result = sb.ToString();
}
python
from ctypes import CDLL, c_int, c_int64, create_string_buffer

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
instance = ola.CreateCOLAPlugInterFace()
ptr = ola.OcrFromDictPtr(instance, 0, "value", "num", 0.9)
if ptr:
    buf = create_string_buffer(512)
    ola.GetStringFromPtr(ptr, buf, 512)
    ola.FreeStringPtr(ptr)
    result = buf.value.decode("utf-8")

返回值 ​

返回值说明
（返回值）字符串指针地址，返回识别到的文字。返回的字符串指针需调用 FreeStringPtr 释放内存。