feature：添加支持sub目录dll加载，避免污染环境变量。

.vscode/settings.json

@@ -84,6 +84,18 @@
         "bit": "cpp",
         "compare": "cpp",
         "concepts": "cpp",
-        "format": "cpp"
+        "format": "cpp",
+        "algorithm": "cpp",
+        "chrono": "cpp",
+        "filesystem": "cpp",
+        "forward_list": "cpp",
+        "fstream": "cpp",
+        "iomanip": "cpp",
+        "list": "cpp",
+        "optional": "cpp",
+        "ratio": "cpp",
+        "sstream": "cpp",
+        "string_view": "cpp",
+        "vector": "cpp"
     }
 }

CMakeLists.txt

@@ -16,8 +16,8 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE}
 
 find_package(OpenSSL REQUIRED)
 add_executable(sha256 sha256.cpp)
-target_link_libraries(sha256 PRIVATE OpenSSL::SSL)
-target_link_libraries(sha256 PRIVATE OpenSSL::Crypto)
+target_link_libraries(sha256 PRIVATE OpenSSL::SSL OpenSSL::Crypto delayimp)
+target_link_options(sha256 PRIVATE "/DELAYLOAD:libcrypto-3-x64.dll")
 add_executable(md5 md5.cpp)
-target_link_libraries(md5 PRIVATE OpenSSL::SSL)
-target_link_libraries(md5 PRIVATE OpenSSL::Crypto)
+target_link_libraries(md5 PRIVATE OpenSSL::SSL OpenSSL::Crypto delayimp)
+target_link_options(md5 PRIVATE "/DELAYLOAD:libcrypto-3-x64.dll")

md5.cpp

@@ -1,25 +1,37 @@
-#include <openssl/md5.h>
 #include <fstream>
-#include <iostream>
 #include <iomanip>
+#include <iostream>
+#include <memory>
+#include <openssl/md5.h>
 #include <sstream>
 #include <vector>
 
-std::string to_hex_string(const unsigned char* hash, size_t length) {
+#ifdef _WIN32
+#include <filesystem>
+#include <windows.h>
+namespace fs = std::filesystem;
+#endif
+
+std::string to_hex_string(const unsigned char* hash, size_t length)
+{
     std::ostringstream oss;
     for (size_t i = 0; i < length; ++i) {
-        oss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(hash[i]);
+        oss << std::hex << std::setw(2) << std::setfill('0')
+            << static_cast<int>(hash[i]);
     }
     return oss.str();
 }
 
-std::string md5_string(const std::string& input) {
+std::string md5_string(const std::string& input)
+{
     unsigned char hash[MD5_DIGEST_LENGTH];
-    MD5(reinterpret_cast<const unsigned char*>(input.c_str()), input.size(), hash);
+    MD5(reinterpret_cast<const unsigned char*>(input.c_str()), input.size(),
+        hash);
     return to_hex_string(hash, MD5_DIGEST_LENGTH);
 }
 
-std::string md5_file(const std::string& filename) {
+std::string md5_file(const std::string& filename)
+{
     std::ifstream file(filename, std::ios::binary);
     if (!file) {
         throw std::runtime_error("Cannot open file: " + filename);
@@ -40,10 +52,18 @@ std::string md5_file(const std::string& filename) {
     return to_hex_string(hash, MD5_DIGEST_LENGTH);
 }
 
-int main(int argc, char* argv[]) {
+int main(int argc, char* argv[])
+{
+
+#ifdef _WIN32
+#include <windows.h>
+    std::string load_dll_dir = fs::path(argv[0]).append("mdsha_dll").string();
+    SetDllDirectory(load_dll_dir.c_str());
+#endif
+
     if (argc != 3) {
         std::cerr << "Usage: " << argv[0] << " <mode> <input>" << std::endl;
-        std::cerr << "Modes:" << std::endl;
+        std::cerr << "Support DelayLoad SubDirectory:mdsha_dll" << std::endl;
         std::cerr << "  -s : Calculate MD5 for a string" << std::endl;
         std::cerr << "  -f : Calculate MD5 for a file" << std::endl;
         return 1;

sha256.cpp

@@ -5,6 +5,12 @@
 #include <sstream>
 #include <vector>
 
+#ifdef _WIN32
+#include <filesystem>
+#include <windows.h>
+namespace fs = std::filesystem;
+#endif
+
 std::string to_hex_string(const unsigned char* hash, size_t length) {
     std::ostringstream oss;
     for (size_t i = 0; i < length; ++i) {
@@ -41,9 +47,16 @@ std::string sha256_file(const std::string& filename) {
 }
 
 int main(int argc, char* argv[]) {
+
+#ifdef _WIN32
+#include <windows.h>
+    std::string load_dll_dir = fs::path(argv[0]).append("mdsha_dll").string();
+    SetDllDirectory(load_dll_dir.c_str());
+#endif
+
     if (argc != 3) {
         std::cerr << "Usage: " << argv[0] << " <mode> <input>" << std::endl;
-        std::cerr << "Modes:" << std::endl;
+        std::cerr << "Support DelayLoad SubDirectory:mdsha_dll" << std::endl;
         std::cerr << "  -s : Calculate SHA-256 for a string" << std::endl;
         std::cerr << "  -f : Calculate SHA-256 for a file" << std::endl;
         return 1;