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可以使用Ghostscript DLL直接调用,避免安装完整软件。以下是使用gsdll32.dll的方案:
- #include <windows.h>
- #include "ierrors.h"
- #include "iapi.h"
- #include <opencv2/opencv.hpp>
- // 定义Ghostscript函数指针
- typedef int (GSDLLAPI *PGSEXECUTE)(void *instance, const char *command);
- typedef int (GSDLLAPI *PGSNEW)(void **pinstance, void *caller_handle);
- typedef int (GSDLLAPI *PGSDELETE)(void *instance);
- typedef int (GSDLLAPI *PGSSETARGS)(void *instance, int argc, char **argv);
- class CVectorConverter {
- private:
- HMODULE m_hGsDll;
- void* m_gsInstance;
- PGSNEW m_pgsNew;
- PGSDELETE m_pgsDelete;
- PGSEXECUTE m_pgsExecute;
- PGSSETARGS m_pgsSetArgs;
- public:
- CVectorConverter() : m_hGsDll(NULL), m_gsInstance(NULL) {}
-
- ~CVectorConverter() {
- Cleanup();
- }
-
- bool Initialize(const CString& dllPath = _T("gsdll32.dll")) {
- m_hGsDll = LoadLibrary(dllPath);
- if (!m_hGsDll) return false;
-
- m_pgsNew = (PGSNEW)GetProcAddress(m_hGsDll, "gsapi_new_instance");
- m_pgsDelete = (PGSDELETE)GetProcAddress(m_hGsDll, "gsapi_delete_instance");
- m_pgsExecute = (PGSEXECUTE)GetProcAddress(m_hGsDll, "gsapi_execute");
- m_pgsSetArgs = (PGSSETARGS)GetProcAddress(m_hGsDll, "gsapi_set_args");
-
- if (!m_pgsNew || !m_pgsDelete || !m_pgsExecute) {
- FreeLibrary(m_hGsDll);
- return false;
- }
-
- return (m_pgsNew(&m_gsInstance, NULL) == 0);
- }
-
- cv::Mat ConvertToImage(const CString& inputFile, int dpi = 300,
- int width = 0, int height = 0) {
- if (!m_gsInstance) return cv::Mat();
-
- CString tempFile = _T("temp_output.png");
- CStringA tempFileA(tempFile);
- CStringA inputFileA(inputFile);
-
- // 构建Ghostscript参数
- const char* args[] = {
- "gswin32c",
- "-dNOPAUSE",
- "-dBATCH",
- "-dSAFER",
- "-sDEVICE=png16m",
- CStringA().Format("-r%d", dpi),
- width > 0 && height > 0 ?
- CStringA().Format("-g%dx%d", width, height) : "-dUseCropBox",
- CStringA().Format("-sOutputFile=%s", tempFileA.GetString()),
- inputFileA.GetString(),
- NULL
- };
-
- int argc = 8; // 参数数量
- if (m_pgsSetArgs(m_gsInstance, argc, (char**)args) == 0) {
- if (m_pgsExecute(m_gsInstance) == 0) {
- cv::Mat result = cv::imread(tempFileA.GetString());
- DeleteFile(tempFile);
- return result;
- }
- }
-
- return cv::Mat();
- }
-
- void Cleanup() {
- if (m_gsInstance && m_pgsDelete) {
- m_pgsDelete(m_gsInstance);
- m_gsInstance = NULL;
- }
- if (m_hGsDll) {
- FreeLibrary(m_hGsDll);
- m_hGsDll = NULL;
- }
- }
- };
- // 使用示例
- void ConvertVectorFile() {
- CVectorConverter converter;
- if (converter.Initialize(_T("gsdll32.dll"))) {
- cv::Mat image = converter.ConvertToImage(_T("input.pdf"), 300, 1920, 1080);
- if (!image.empty()) {
- // 处理图像...
- }
- }
- }
复制代码
使用步骤:
1. 从Ghostscript官网下载DLL文件包
2. 将以下文件放在可执行文件目录:
- gsdll32.dll (或gsdll64.dll)
- gsdll32.lib
- gs文件夹(包含字体和资源)
3. 在项目中包含头文件:
ierrors.h 和 iapi.h
优点:
- 无需安装Ghostscript
- 程序可独立分发
- 转换速度快
- 支持所有Ghostscript支持的格式
注意事项:
- 确保DLL版本与项目架构匹配(32/64位)
- 资源文件路径需要正确配置
- 多线程环境下需要适当的同步
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