dotnettester.cpp

检查操作系统下是否安装了net.framework,以及它的版本号

// dotNetTester: Test for the existance of a specific .Net Framework version and launch an application
// Written by Guy Vider, 25/4/2007, [e-mail] 
// Feel free to use the code whnever and wherever it helps you - just keep this comment in :)

#include "stdafx.h"
#include <afxcoll.h>

#define	KEY		_T("SOFTWARE\\Microsoft\\.NETFramework\\policy")
#define	KEY_LEN	256
#define VERSION	3	


// Check the subkeys of the registry key HKLM\SOFTWARE\Microsoft\.NETFramework\policy
// FW specific keys will appear as subkeys formatted like this: with a V<major>.<minor>
bool CheckRegistryKeyExistance(TCHAR *fwVersion)
{
	HKEY hKey;
	DWORD dwIndex = 0;
	DWORD cbName = KEY_LEN;
	TCHAR sz[KEY_LEN];
	bool result = false;
	
	try
	{
		if(ERROR_SUCCESS == ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, KEY, 0, KEY_READ, &hKey))
		{
			// Iterate through all subkeys
			while ((ERROR_NO_MORE_ITEMS != ::RegEnumKeyEx(hKey, dwIndex, sz, &cbName, NULL, NULL, NULL, NULL)))
			{
				if(!_tcsnicmp(sz, _T("V"), 1))
					_tcsncpy(fwVersion, sz+1, VERSION + 1);
				dwIndex++;
				cbName = KEY_LEN;
			}
			::RegCloseKey(hKey);
			printf("Fraemwork version found: %s\n", fwVersion);
			result = true;
		}
		else
			result = false;
		return result;
	}
	catch(...)
	{
		return false;
	}
}

//Compare the existing and required FW version numbers
bool CompareFWVersions(TCHAR *existing, TCHAR *required)
{
	int existingMajor = atoi(existing);
	int existingMinor = atoi(existing+2);
	int requiredMajor = atoi(required);
	int requiredMinor = atoi(required+2);
	bool result = false;

	// very simple comparison algorithm, really
	if(requiredMajor < existingMajor)
		result = true;
	else if(requiredMajor == existingMajor && requiredMinor <= existingMinor)
		result = true;
	else
		result = false;
	return result;
}

//Run an application  the simplest, shortest way...
void RunApplication(char *path)
{
	printf("Now starting %s...\n", path);
	try
	{
		WinExec(path, SW_SHOW);
	}
	catch(...)
	{
		printf("Couldn't run %s\n", path);
		exit(-4);
	}
}

// Main function
int main(int argc, char* argv[])
{
	TCHAR fwVersion[VERSION];

	// Ensure correct number of parameters
	if(argc < 2 || argc > 3)
	{
		printf("Usage: dotNetTester <minimum FW version (x.y)> [<path of app to run>]\n");
		exit(-1);
	}

	// Check if Framework key exists and get the FW version if yes
	if(CheckRegistryKeyExistance(fwVersion))
	{
		// Compare versions
		if(CompareFWVersions(fwVersion, argv[1]))
		{
			// Launch an application, if the user requested it
			if(3 == argc)
				RunApplication(argv[2]);
		}
		else
		{
			// Minimum FW requirement not met
			printf("Minimum required .Net Framework version is %s, you have version %s installed. Please install the proper .Net Framework\n", argv[1], fwVersion);
			exit(-2);
		}
	}
	else
	{
		// No FW exists
		printf("Please install the latest .Net Framework  - it can be downloaded from Microsoft\n", argv[1], fwVersion);
		exit(-3);
	}
	
	return 0;
}