c++取随机数 c++取MD5值

取MD5

#include <wincrypt.h>  //需要引入的头文件
CString MD5(CONST CString 字符串)
{
	CString MD5str(_T(""));

	CStringA tmp;
	tmp = 字符串;
	char * pp = tmp.GetBuffer();

	HCRYPTPROV hProv;
	if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) 	{return MD5str;}

		

	HCRYPTHASH hHash;
	if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash))
	{
		CryptReleaseContext(hProv, 0);
		return MD5str;
	}
	if (!CryptHashData(hHash, (BYTE *)pp, strlen(pp), 0))
	{
		CryptDestroyHash(hHash);
		CryptReleaseContext(hProv, 0);
		return MD5str;
	}
	DWORD dwSize;
	DWORD dwLen = sizeof(dwSize);
	CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)(&dwSize), &dwLen, 0);
	BYTE* pHash = new BYTE[dwSize];
	dwLen = dwSize;
	CryptGetHashParam(hHash, HP_HASHVAL, pHash, &dwLen, 0);
	for (DWORD i = 0; i<dwLen; i++)
		MD5str.AppendFormat(_T("%02X"), pHash[i]);
	delete[] pHash;
	CryptDestroyHash(hHash);
	CryptReleaseContext(hProv, 0);
	MD5str.MakeLower();
	return MD5str;
}

取随机数:

srand(::GetTickCount());  //置随机数种子 在窗口创建后 执行一次即可

CString 取随机数(int 最小值, int 最大值){
	CString str;
	int a = rand() % (最大值-最小值+1);
	str.Format(_T("%d"), a+最小值);
	return str;
}