办公室通过路由器上网，所以不能直接远程桌面登录到自己计算机上，办公室的人都想在宿舍登录到自己的计算机上工作学习，所以可以简单的将路由器的3389端口(windows远程桌面默认使用3389端口)映射到自己的IP上，同时修改其他人计算机的远程桌面端口，然后再相应的将路由器端口映射到自己的IP上即可。
修改远程桌面端口需要修改注册表中的两个值：
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp]
"PortNumber"=dword:00000d3d
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Wds\rdpwd\Tds\tcp]
"PortNumber"=dword:00000d3d
修改两个值，十进制是0-65535，双字十六进制是0x00000000-0x0000FFFF，推荐修改为1024以上。
如何使用windows api编写一个小程序来修改端口呢？接下来就详细的讲讲这个程序应该如何实现，另外在讨论一下如何使用windows api编写简单的windows程序。
下载开源的windows api集成开发环境Code::Blocks (
访问Code::Blocks主页)
建议下载集成mingw的CodeBlocks，这样就不用单独下载安装mingw了，如果不知道什么是mingw，赶紧google一下看看吧。配置好开发环境后，就可以开始下一步啦。
启动Code::Blocks，然后新建一个Win32 GUI Project，这样IDE会自动构建一个对话框，而且程序的基本结构也就构造好了。程序的入口就是WinMain函数，然后就可以在这个基础之上编写我们的程序了。
先确定这个程序有几个窗口，然后修改resource.rc文件，资料都可以去MSDN查找
resource.rc
1
#include "resource.h"
2
3DLG_MAIN DIALOGEX 6,6,269,131
4STYLE 0x90CC0800
5CAPTION "远程桌面连接端口修改器"
6FONT 8,"MS Sans Serif",0,0
7BEGIN
8 CONTROL "",IDC_EDT,"Edit",0x50010000,72,51,170,13,0x00000200
9 CONTROL "十进制(&D)",IDC_RBN_D,"Button",0x50010009,20,81,54,9
10 CONTROL "十六进制(&H)",IDC_RBN_H,"Button",0x50010009,90,81,60,9
11 CONTROL "二进制(&B)",IDC_RBN_B,"Button",0x50010009,164,81,54,9
12 CONTROL "修改(&E)",IDC_BTN_E,"Button",0x50010000,14,107,54,13
13 CONTROL "还原(&B)",IDC_BTN_B,"Button",0x50010000,70,107,54,13
14 CONTROL "关于(&A)",IDC_BTN_A,"Button",0x50010000,126,107,54,13
15 CONTROL "退出(&Q)",IDC_BTN_Q,"Button",0x50010000,198,107,54,13
16 CONTROL "远程桌面端口",IDC_STC,"Static",0x50000000,16,53,52,9
17 CONTROL "基数",IDC_GRP,"Button",0x50000007,14,70,228,24
18 CONTROL "#1013",IDC_IMG,"Static",0x5000020E,0,0,271,44
19END
20ICON_LOH ICON DISCARDABLE "rd.ico"
21BMP_HEAD BITMAP DISCARDABLE "head.bmp"
22
23IDD_DLG_ABOUT DIALOGEX 55,25,151,55
24CAPTION "关于"
25FONT 8,"MS Sans Serif",0,0
26STYLE 0x90CC0000
27BEGIN
28 CONTROL "#1012",IDC_IMG_ABOUT,"Static",0x50000203,14,11,20,19
29 CONTROL "远程桌面链接端口修改器\nloh.wong@qq.com",IDC_STC_ABOUT,"Static",0x50000000,42,11,94,20
30 CONTROL "确定",IDC_BTN_ABOUT,"Button",0x50010000,106,38,40,13
31END
32
resource.rc文件很简单，包括两个对话框，同时对话框里包括了一些简单的控件。
修改resource.h文件，在其中添加一些控件的预定义
resource.h
1#include <windows.h>
2
3// ID of Main Dialog
4#define DLG_MAIN 1000
5
6// ID of Button Controls
7#define IDC_GRP 1003
8#define IDC_STC 1001
9#define IDC_EDT 1002
10#define IDC_RBN_H 1004
11#define IDC_RBN_D 1005
12#define IDC_BTN_E 1006
13#define IDC_BTN_B 1007
14#define IDC_BTN_Q 1008
15#define IDC_BTN_A 1009
16#define IDC_IMG 1010
17#define IDC_RBN_B 1011
18#define ICON_LOH 1012
19#define BMP_HEAD 1013
20
21//About Dialog
22#define IDD_DLG_ABOUT 1017
23#define IDC_STC_ABOUT 1014
24#define IDC_BTN_ABOUT 1015
25#define IDC_IMG_ABOUT 1016
26
编写一些简单的工具函数，主要实现2进制、10进制和16进制之间的相互转换，和一些输入的校验。这个程序做的不是很完善，没有校验一些输入数据。
这里是utils.h文件(H代表16进制，D代表10进制，B代表2进制)
utils.h
1#ifndef UTILS_H_INCLUDED
2#define UTILS_H_INCLUDED
3
4#define H 16
5#define D 10
6#define B 2
7
8#define RD_FALSE 0
9#define RD_TRUE 1
10
11/**//*格式转换*/
12char * strReverse(char *);
13char * DtoDstr(int);
14int CommontoD(char *, int);
15
16char * HtoD(char *);
17char * BtoD(char *);
18
19char * HtoB(char *);
20char * DtoB(char *);
21
22char * BtoH(char *);
23char * DtoH(char *);
24
25/**//*格式检查*/
26int HFormatCheck(char *);
27int BFormatCheck(char *);
28int DFormatCheck(char *);
29
30#endif // UTILS_H_INCLUDED
31
这里是utils.c文件
utils.c
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <math.h>
5#include "utils.h"
6
7//字符串逆序
8char * strReverse(char *str)
9
{
10
int i,j,len = strlen(str);
11 char * res = (char*)malloc(len + 1);
12 memset(res, 0, len + 1);
13
for(i = len - 1, j = 0; i >= 0; i --, j ++){
14 res[j] = str[i];
15
}
16 return res;
17
}
18
19//2，16进制转10进制
20int CommontoD(char *pC, int factor)
21{
22 pC = strReverse(pC);
23 int d_res = 0;
24 int d_num = 0;
25 int i;
26 for(i = strlen(pC) - 1; i >= 0; i --)
27 {
28 if(pC[i] >= '0' && pC[i] <= '9'){
29 d_num = pC[i] - '0';
30 }
31 if(pC[i] >= 'a' && pC[i] <= 'f'){
32 d_num = pC[i] - 87;
33 }
34 if(pC[i] >= 'A' && pC[i] <= 'F'){
35 d_num = pC[i] - 55;
36 }
37 d_res += d_num * pow(factor, i);
38 }
39 return d_res;
40}
41
42//将10进制数转为字符串
43char * DtoDstr(int d_num)
44{
45 char *d_str = (char*)malloc(6);
46 memset(d_str,0,6);
47 int i = 0;
48 while(d_num > 0)
49 {
50 d_str[i++] = (d_num % 10) + '0';
51 d_num /= 10;
52 }
53 return strReverse(d_str);
54}
55//二进制到十进制
56char * BtoD(char *pB)
57{
58 return DtoDstr(CommontoD(pB, B));
59}
60
61//十六进制到十进制
62char * HtoD(char *pH)
63{
64 return DtoDstr(CommontoD(pH, H));
65}
66
67
68//十进制到二进制
69char * DtoB(char *pD)
70{
71 //65535用16个1表示
72 //开17个就够了
73 char *b_str = (char*)malloc(17);
74 memset(b_str,0,17);
75 int d_num = atoi(pD);
76 int i = 0;
77 while(d_num > 0){
78 b_str[i++] = (d_num % 2) + '0';
79 d_num /= 2;
80 }
81 return strReverse(b_str);
82}
83
84//十六进制转二进制
85char * HtoB(char *pH)
86{
87 return DtoB(HtoD(pH));
88}
89
90//十进制到十六进制
91char * DtoH(char *pD)
92{
93 //65535用4个f表示
94 //开5个就够了
95 char *h_str = (char*)malloc(5);
96 memset(h_str,0,5);
97 int d_num = atoi(pD);
98 int bit;
99 int i = 0;
100 while(d_num > 0){
101 bit = d_num % 16;
102 if(bit >= 0 && bit <= 9){
103 h_str[i++] = bit + '0';
104 }
105 else{
106 h_str[i++] = bit + 87;
107 }
108 d_num /= 16;
109 }
110 return strReverse(h_str);
111}
112
113//二进制转十六进制
114char * BtoH(char *pB)
115{
116 return DtoH(BtoD(pB));
117}
118
119//检查16进制数是否合法
120int HFormatCheck(char *pH)
121{
122 if(pH == NULL){
123 return RD_FALSE;
124 }
125
126 int len = strlen(pH);
127 int i;
128 for(i = 0; i < len; i ++)
129 {
130 if(!((pH[i] >= '0' && pH[i] <= '9') || (pH[i] >= 'a' && pH[i] <= 'f') || (pH[i] >= 'A' && pH[i] <= 'F') ))
131 {
132 return RD_FALSE;
133 }
134 }
135 return RD_TRUE;
136}
137//检查2进制数是否合法
138int BFormatCheck(char *pH)
139{
140 if(pH == NULL){
141 return RD_FALSE;
142 }
143
144 int len = strlen(pH);
145 int i;
146 for(i = 0; i < len; i ++)
147 {
148 if(!(pH[i] >= '0' && pH[i] <= '1'))
149 {
150 return RD_FALSE;
151 }
152 }
153 return RD_TRUE;
154}
155
156//检查10进制数是否合法
157int DFormatCheck(char *pH)
158{
159 if(pH == NULL){
160 return RD_FALSE;
161 }
162
163 int len = strlen(pH);
164 int i;
165 for(i = 0; i < len; i ++)
166 {
167 if(!(pH[i] >= '0' && pH[i] <= '9'))
168 {
169 return RD_FALSE;
170 }
171 }
172 return RD_TRUE;
173}
174
175
176
最后是主程序main.c
main.c
1#include <windows.h>
2#include <stdio.h>
3#include <stdlib.h>
4
5#include "utils.h"
6#include "resource.h"
7
8HINSTANCE hInst;
9HICON hIcon;
10int id_pre_checked;
11int port;
12char *buf;
13
14//两个注册表
15HKEY winstations;
16HKEY wds;
17
18//获得十进制的数
19int GetPortNumber(char *port, int IDC)
20{
21 //char * res;
22 if(IDC == IDC_RBN_D)
23 {
24 return atoi(port);
25 }
26 if(IDC == IDC_RBN_H)
27 {
28 return atoi(HtoD(port));
29 }
30 if(IDC == IDC_RBN_B)
31 {
32 return atoi(BtoD(port));
33 }
34 return -1;
35}
36
37//关于窗口
38BOOL CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
39{
40 switch(uMsg)
41 {
42 case WM_INITDIALOG:
43 SendMessage(hwndDlg,WM_SETICON,ICON_BIG,(LPARAM)hIcon);
44 //SendMessage(hwndDlg,WM_SETICON,ICON_SMALL,(LPARAM)hIcon);
45 return TRUE;
46 case WM_CLOSE:
47 EndDialog(hwndDlg, 0);
48 return TRUE;
49
50 case WM_COMMAND:
51 switch(LOWORD(wParam))
52 {
53 case IDC_BTN_ABOUT:
54 EndDialog(hwndDlg, 0);
55 return TRUE;
56 }
57 }
58 return FALSE;
59}
60
61//主窗口
62BOOL CALLBACK DialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
63{
64 switch(uMsg)
65 {
66 case WM_INITDIALOG:
67 //设置十进制是选中状态
68 CheckRadioButton(hwndDlg,IDC_RBN_D,IDC_RBN_B,IDC_RBN_D);
69 id_pre_checked = IDC_RBN_D;
70 buf = (char *)malloc(20);
71
72 //打开注册表
73 RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\Wds\\rdpwd\\Tds\\tcp",0,KEY_ALL_ACCESS,&wds);
74 RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\WinStations\\RDP-Tcp",0,KEY_ALL_ACCESS,&winstations);
75
76 //读取注册表的值
77 DWORD value = 0;
78 DWORD dwType = REG_DWORD;
79 DWORD dwSize = sizeof(DWORD);
80 RegQueryValueEx(wds,"PortNumber",NULL,&dwType,(LPBYTE)&value, &dwSize);
81
82 SetDlgItemText(hwndDlg,IDC_EDT,DtoDstr(value));
83
84 //加载图标
85 hIcon = LoadIcon(hInst,(LPCTSTR)ICON_LOH);
86 SendMessage(hwndDlg,WM_SETICON,ICON_BIG,(LPARAM)hIcon);
87 //SendMessage(hwndDlg,WM_SETICON,ICON_SMALL,(LPARAM)hIcon);
88 return TRUE;
89
90 case WM_CLOSE:
91 EndDialog(hwndDlg, 0);
92 RegCloseKey(wds);
93 RegCloseKey(winstations);
94 return TRUE;
95
96 case WM_COMMAND:
97 switch(LOWORD(wParam))
98 {
99 case IDC_BTN_Q:
100 EndDialog(hwndDlg, 0);
101 return TRUE;
102
103 case IDC_BTN_E:
104 memset(buf,0,20);
105 GetDlgItemText(hwndDlg,IDC_EDT,buf,19);
106 port = GetPortNumber(buf,id_pre_checked);
107 if(RegSetValueEx(wds,"PortNumber",0,REG_DWORD,(LPBYTE)&port, sizeof(DWORD)) || RegSetValueEx(winstations,"PortNumber",0,REG_DWORD,(LPBYTE)&port, sizeof(DWORD)))
108 {
109 printf("Could not set the event message file.");
110 }
111 return TRUE;
112
113 case IDC_BTN_B:
114 port = 3389;
115 if(RegSetValueEx(wds,"PortNumber",0,REG_DWORD,(LPBYTE)&port, sizeof(DWORD)) || RegSetValueEx(winstations,"PortNumber",0,REG_DWORD,(LPBYTE)&port, sizeof(DWORD)))
116 {
117 printf("Could not set the event message file.");
118 }
119 SetDlgItemText(hwndDlg,IDC_EDT,DtoDstr(port));
120 return TRUE;
121
122 case IDC_BTN_A:
123 //MessageBox(hwndDlg, "关于!", "提示信息", MB_ICONINFORMATION);
124 return DialogBox(hInst, MAKEINTRESOURCE(IDD_DLG_ABOUT), hwndDlg, AboutDialogProc);
125 //return TRUE;
126
127 case IDC_RBN_D:
128 memset(buf,0,20);
129 GetDlgItemText(hwndDlg,IDC_EDT,buf,19);
130 if(id_pre_checked == IDC_RBN_H)
131 {
132 SetDlgItemText(hwndDlg, IDC_EDT, HtoD(buf));
133 }
134 if(id_pre_checked == IDC_RBN_B)
135 {
136 SetDlgItemText(hwndDlg,IDC_EDT,BtoD(buf));
137 }
138
139 id_pre_checked = IDC_RBN_D;
140 return TRUE;
141
142 case IDC_RBN_H:
143 memset(buf,0,20);
144 GetDlgItemText(hwndDlg,IDC_EDT,buf,19);
145 if(id_pre_checked == IDC_RBN_D)
146 {
147 SetDlgItemText(hwndDlg, IDC_EDT, DtoH(buf));
148 }
149 if(id_pre_checked == IDC_RBN_B)
150 {
151 SetDlgItemText(hwndDlg,IDC_EDT,BtoH(buf));
152 }
153 id_pre_checked = IDC_RBN_H;
154 return TRUE;
155
156 case IDC_RBN_B:
157 memset(buf,0,20);
158 GetDlgItemText(hwndDlg,IDC_EDT,buf,19);
159 if(id_pre_checked == IDC_RBN_H)
160 {
161 SetDlgItemText(hwndDlg, IDC_EDT, HtoB(buf));
162 }
163 if(id_pre_checked == IDC_RBN_D)
164 {
165 SetDlgItemText(hwndDlg,IDC_EDT,DtoB(buf));
166 }
167 id_pre_checked = IDC_RBN_B;
168 return TRUE;
169 }
170 }
171 return FALSE;
172}
173
174
175int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
176{
177 hInst = hInstance;
178
179 // The user interface is a modal dialog box
180 return DialogBox(hInstance, MAKEINTRESOURCE(DLG_MAIN), NULL, DialogProc);
181}
182
关于使用windows api操作注册表需要注意的是：
1.先打开注册表，获得注册表的句柄，代码为:
1 //打开注册表
2 RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\Wds\\rdpwd\\Tds\\tcp",0,KEY_ALL_ACCESS,&wds);
3 RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\WinStations\\RDP-Tcp",0,KEY_ALL_ACCESS,&winstations);
2.然后在读入注册表的值或是写入注册表的值
例如读取PortNumber的值到变量value中：
//读取注册表的值
DWORD value = 0;
DWORD dwType = REG_DWORD;
DWORD dwSize = sizeof(DWORD);
RegQueryValueEx(wds,"PortNumber",NULL,&dwType,(LPBYTE)&value, &dwSize);
例如写值到PortNumber中：
int port = 3389；
RegSetValueEx(wds,"PortNumber",0,REG_DWORD,(LPBYTE)&port, sizeof(DWORD))
这里是最终程序的截图，[下载这个程序]
