取文件MD5 WINAPI

#include <windows.h>
#include <wincrypt.h>
#include <stdio.h>

BOOL GetFileHash(LPCSTR lpFileName, LPSTR lpHash)
{
    BOOL bResult = FALSE;

    HANDLE hFile = CreateFile(lpFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hFile != INVALID_HANDLE_VALUE)
    {
        DWORD dwFileSize = GetFileSize(hFile, NULL);

        if (dwFileSize > 0)
        {
            PBYTE lpBuffer = (PBYTE)VirtualAlloc(NULL, dwFileSize, MEM_COMMIT, PAGE_READWRITE);

            if (lpBuffer != NULL)
            {
                DWORD dwNumOfRead;

                if (ReadFile(hFile, lpBuffer, dwFileSize, &dwNumOfRead, NULL) != FALSE)
                {
                    HCRYPTPROV hProv;

                    if (CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT) != FALSE)
                    {
                        HCRYPTHASH hHash;

                        if (CryptCreateHash(hProv, CALG_MD5, NULL, NULL, &hHash) != FALSE)
                        {
                            if (CryptHashData(hHash, lpBuffer, dwFileSize, NULL) != FALSE)
                            {
                                BYTE bData[16]; DWORD dwDataLen;

                                if (CryptGetHashParam(hHash, HP_HASHVAL, bData, &dwDataLen, NULL) != FALSE)
                                {
                                    if (dwDataLen == 16)
                                    {
                                        LPSTR lpStr = lpHash;

                                        for (DWORD i = 0; i < dwDataLen; i++, lpStr += 2)
                                        {
                                            sprintf(lpStr, "%02X", bData[i]);
                                        }

                                        bResult = TRUE;
                                    }
                                }
                            }

                            CryptDestroyHash(hHash);
                        }

                        CryptReleaseContext(hProv, NULL);
                    }
                }

                VirtualFree(lpBuffer, 0, MEM_RELEASE);
            }
        }

        CloseHandle(hFile);
    }

    return bResult;
}