windows API CryptBinaryToString

2019-11-09 20:34:27

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// windowsapi 直接調用的base64編碼解碼函數// #include <windows.h> #include <Wincrypt.h> #PRagma comment(lib,"crypt32") #include "base64.h" using namespace gloox; static unsigned long get_file_size(const char *path) { unsigned long filesize = -1; FILE *fp; fp = fopen(path, "r"); if(fp == NULL) return filesize; fseek(fp, 0L, SEEK_END); filesize = ftell(fp); fclose(fp); return filesize; } int _tmain(int argc, _TCHAR* argv[]) { const char path[] = "silence.png"; ULONG uSize = get_file_size(path); FILE* fp = fopen(path, "rb"); char* inBuffer = new char[uSize]; ULONG uReaded = fread(inBuffer, 1, uSize, fp); const BYTE* pbBinary = (const BYTE*)inBuffer; DWord dwLen; CryptBinaryToStringA(pbBinary, uSize, CRYPT_STRING_BASE64, NULL, &dwLen); //把二進制序列轉換成字符串 char* pCrypt1 = new char[dwLen]; CryptBinaryToStringA(pbBinary, uSize, CRYPT_STRING_BASE64, pCrypt1, &dwLen);//把二進制序列轉換成字符串 fclose(fp); std::string strIn(pCrypt1); int nIn = strIn.length(); std::string strOut = Base64::encode64(strIn); int nOut = strOut.length(); ////////////////////////////////////////////////////////////// std::string strFile = Base64::decode64(strOut); int nFile = strFile.length(); int nFileSize = strFile.size(); DWORD cbBinary; DWORD dwSkip; DWORD dwFlags; CryptStringToBinaryA(strFile.data(), nFile+1, CRYPT_STRING_BASE64, NULL, &cbBinary, &dwSkip, &dwFlags); BYTE* outBuffer = new BYTE[cbBinary]; CryptStringToBinaryA(strFile.data(), nFile+1, CRYPT_STRING_BASE64, outBuffer, &cbBinary, &dwSkip, &dwFlags); FILE* fp2 = fopen("silence2.png", "wb"); ULONG uWrite = fwrite(outBuffer, 1, uSize, fp2); fclose(fp2); return 0; }

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