View Messages with spy ++

The spy ++ tool provided by VC has never been used. I found an article on the Internet. It feels better to share it.

Use spy ++ to view messages and send messages to the control program Windows programs are based on message mechanisms, and each program has a variety of messages, To control program running through messages, we only need to care about the command messages in the program. (Wm_command). You can ignore other messages about the program interface. To view the process Run messages in sequence using the tool spy ++ in Visual Studio. Open spy ++, select spy | Windows, and all current windows will be displayed. Some word windows in the main window will also be displayed, such as the toolbar window and editing window. In Find the target window. Below are some of the spy ++ windows displayed when I run spy ++, with the finereader window 001702a6-tooltips_class32 000c01fe-"M" msctfime ul 001c02a0-"Default ime" ime 002401do-tooltips_class32 003b009a-"Microsoft spy ++- [Windows 2] "afx: 100000: 0: 10011: 0: 2600515 00300244-"M" msctfime ul 002e032e-finereadertipwindowclass 004f02b4-tooltips_class32 00410254-"untitled batch-abbyy finereader 7.0 Professional Edition" Finereader7mainwindowclass 003e0370-"DDE Server window" oleddewndclass 005002dc-combolbox 000d02b6-combolbox 00270320-combolbox 00ab0366-combolbox 00a000a4-tooltips_class32 (Note: The above is the result captured by print screen and then identified by finereader) Select finereader, right-click, and select "messages" in the pop-up menu to start Listen to messages in this window. If you do this, you will find that there are a lot of messages and you cannot Find the message you want to view. To select the desired message, we need to filter the message. Select Messages | options: select the messages tab in the pop-up menu. You can see many message filtering options. I want to listen to wm_command messages, so after I clear all, I only select general messages. After the preceding settings, start listening to messages and click the read shortcut in the finereader window. (After setting this button, finereader starts to recognize the selected image), then returns to spy ++ and listens There are still a lot of messages, but you can find the messages we want to view. If you only press one button or Menu, you should be able to find two wm_command messages, one sent Message, a returned message. For more information, see the following description. The following are the messages I have listened to in spy ++. One of them is a wm_command message. <00039> 00410254 r... <00040> 00410254 s ...... command V/policycode: 0 (sent from Menu] wld: 4o2o3 <00041> 00410254 s ...... wm_gettext cchtextmax: 512 Lpsztext: 0012e200 <00042> 00410254 r ...... gettext cchcopied: 72 Lpsztext: 0012e200 f'u' L (Note: The above is the result captured by print screen and then identified by finereader) Double-click the wm_command message to view details about the message, as shown below: Window handle 001f00aa // finereader window handle Nesting level 2 Message 0111 (sent) // wm_command Message ID, which is the sent message Wm_command Wparam ipv9d0b // two parameters of the wm_command message Lparam 00000000 Another wm_command message monitored in spy ++ <00089> 00410254 s ...... wm_gettext cchtextmax: 512 Lpsztext: 0012e1e0 <00090> 00410254 r ...... gettext cchcopied: 71 Lpsztext: 0012e1e0 (V ") <00092> 00410254 s ...... wm_1_y idctrl: 177 pnmh: 0012f988 (Note: The above is the result captured by print screen and then identified by finereader) Double-click the wm_command message to view details about the message, as shown below: Window handle 001f00aa // finereader window handle Nesting level 2 Message 0111 (return) // wm_command Message ID, which is the message Wm_command Wparam ipv9d0b // two parameters of the wm_command message Lparam 00000000 Now that you can view the Message ID and parameters in the program, you can write Program, send the corresponding message to the controlled program to control the program running. Step 1: Open the target program in your program and use the API. For details, see msdn. Hinstance ShellExecute ( Hwnd, Lpctstr lpoperation, Lpctstr lpfile, Lptstr lpparameters, Lpctstr lpdirectory, Int nshowcmd ); In my program, the target program is finereader. The code for opening the program is as follows: Hinstance HRET = 0; HRET = ShellExecute (m_hwnd, Null, "D: \ Program Files \ abbyy finereader 7.0 professional Edition \ finereader.exe ", Null, Null, Sw_hide ); If (INT) HRET <= 32) { MessageBox ("failed to open finereader! "); } Step 2: Find the target window and obtain the handle of the target window. Cwnd * pwnd = NULL; // The program may be slow to start. You need to try multiple times to find the target window. While (pwnd = NULL) { Sleep (1000 ); Pwnd = findwindow (null, "batch-abbyy finereader 7.0 professional Edition "); } Step 3: send a message to the target window. When the finereader starts running, the last batch is automatically opened, so we only use Send message, Let finereader start identification. The wm_command identified by the finereader can be viewed through spy ++. The information is as follows: Message 0111 (sent) Wm_command Wparam rj9d0b Lparam 00000000 Use sendmessage to send the message to the finereader in the following way. Next step : Sendmessage (pwnd-> getsafehwnd (), 0x0111, 0x9d0b, 0 ); After finereader recognition is complete, you can save the result as a file or send it to the clipboard. Choose to make it Send the recognition result to the clipboard. Similarly, use Spy ++ to listen for messages and their parameters, and then send the corresponding messages, As follows: Message 0111 (sent) Wm_command Wparam ipv9da1 Lparam 00000000 : Sendmessage (pwnd-> getsafehwnd (), 0x0111, 0x9da1, 0 ); After performing these operations, the finereader can identify the results directly from the clipboard, The related code is as follows: If (! Isclipboardformatavailable (cf_text )) Return; If (! Openclipboard ()) Return; Hglobal hglb = getclipboarddata (cf_text ); If (hglb! = NULL) { Lptstr = (char *) globallock (hglb ); If (lptstr! = NULL) { MessageBox (lptstr, "recognition result "); Globalunlock (hglb ); } } Emptyclipboard (); Closeclipboard (); Step 4: after the operation, close the target program and send the message. First, I thought it was okay to directly send the wm_quit message. Later I found that it was not enough. I used spy ++ to listen and found that, The wm_close message should be sent. : Sendmessage (pwnd-> getsafehwnd (), wm_close, 0, 0 ); Now, the basic operation is implemented. In fact, I think that, as long as you do well, you can create an interface by yourself. On behalf of the interface. From: http://hi.baidu.com/chenfalei/blog/item/725c9a230237f640ac34de1e.html