在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
*2:)Rf
{F@;45)o 一、实现方法
XJ?@l3D: +Kf::[wP7 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
J,7_5V@jJ a#uJzYB0 #pragma data_seg("shareddata")
1"v;w!uh HHOOK hHook =NULL; //钩子句柄
i3e|j(Gs4 UINT nHookCount =0; //挂接的程序数目
*,'"\n static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
]nfS vPb static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
N" E\o,_ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
"H G:by static int KeyCount =0;
;P2~cQjD; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
~gBqkZ# y? #pragma data_seg()
4a!L/m* ?[m5|ty# 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
][?GJ"O+U .-WCB DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
i^QcW!X& 4
Qw;r BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
@&EP&
$* cKey,UCHAR cMask)
$7BD~U {
k?S-peyRO BOOL bAdded=FALSE;
{|rwIRe for(int index=0;index<MAX_KEY;index++){
Q| xPm: if(hCallWnd[index]==0){
YDmFR,047 hCallWnd[index]=hWnd;
0hNc#x6 HotKey[index]=cKey;
B"Fg`s+]U HotKeyMask[index]=cMask;
-C8awtbC bAdded=TRUE;
>Zr/U!W*? KeyCount++;
Pc4sReo' break;
l;|1C[V }
0j_!)B }
0;XnNz3& return bAdded;
wkIH<w|jb }
w6wXe_N+M //删除热键
lcUL7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
^3r2Q?d\ {
Q7DkhKT BOOL bRemoved=FALSE;
fq F1-% for(int index=0;index<MAX_KEY;index++){
Y:byb68 if(hCallWnd[index]==hWnd){
|20p#]0E+ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
LXK+WB/s hCallWnd[index]=NULL;
9k*'5(D4S HotKey[index]=0;
PMTyiwlm HotKeyMask[index]=0;
|UlScUI, bRemoved=TRUE;
E4{^[=} KeyCount--;
W0nRUAo[ break;
BRW
}
wiFckF/
}
7M$>'PfO }
JgxOxZS`@ return bRemoved;
Af
-{' }
GQ[\R&]q< =)T5Y,+rJ rsc8lSjH DLL中的钩子函数如下:
z{%G c3Mql+@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
N*$Q(K {
e{?~m6 BOOL bProcessed=FALSE;
5q8bM.k\7N if(HC_ACTION==nCode)
].Et&v {
\?GMtM,
if((lParam&0xc0000000)==0xc0000000){// 有键松开
zb9$ switch(wParam)
7%?A0%>6G {
Q}m)Q('Rk case VK_MENU:
c5t?S@b MaskBits&=~ALTBIT;
lJK U^?4S8 break;
$Itehy case VK_CONTROL:
zx\?cF MaskBits&=~CTRLBIT;
D&]SPhX break;
\Mi y+<8$ case VK_SHIFT:
~s88JLw%&u MaskBits&=~SHIFTBIT;
M~wJe@bc break;
]^.#d default: //judge the key and send message
@=@WRPGM*9 break;
km8[azB o }
^TDHPBlG for(int index=0;index<MAX_KEY;index++){
Z,Q)\W<'- if(hCallWnd[index]==NULL)
e&wWlB![ continue;
,!Q2^R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*%Q!22?6F {
'GNT'y_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[S*bN!t bProcessed=TRUE;
d7l0;yR&+ }
jMZ{>l.v }
4INO . }
F7L+bv else if((lParam&0xc000ffff)==1){ //有键按下
:,:r switch(wParam)
` NcWy {
NPKRX Li% case VK_MENU:
U?H!:?,C MaskBits|=ALTBIT;
$7lI Dt break;
bl:.D~@ case VK_CONTROL:
]JtK)9 MaskBits|=CTRLBIT;
3;#v$F8R break;
up`!r;5- case VK_SHIFT:
ci|6SaY* MaskBits|=SHIFTBIT;
#uFP
eu: break;
@Vc*JEW default: //judge the key and send message
\~U8<z break;
,GGr@}) }
lS9rgq<n for(int index=0;index<MAX_KEY;index++){
r1xNU0A if(hCallWnd[index]==NULL)
V[Auw3) continue;
NtSa#$A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#(!> {
lcyan SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
vMDV%E S1t bProcessed=TRUE;
91e&-acA }
3fM~R+p }
$^d,>hJi }
Xb3z<r
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
leX&py for(int index=0;index<MAX_KEY;index++){
b`fPP{mG if(hCallWnd[index]==NULL)
mq su8ti continue;
WHMt$W}% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/J8y[aa SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(q"Nt_y //lParam的意义可看MSDN中WM_KEYDOWN部分
)<t5' +d% }
K`768%q }
GnkNoaU }
jL>IX`,+6 return CallNextHookEx( hHook, nCode, wParam, lParam );
8?h-H#h }
ytKh[Uo Hh4$Qr;R 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
BUuNI_?M#5 PiP\T.XANa BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
y2yW91B, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
OT&J OTk\ hK&jo(V 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
DHd9yP9- >@rsh-Z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
uL\ B[<: {
8dNwi&4 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
"VRc R {
>/Gz*. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
D({%FQ" SaveBmp();
M6[&od return FALSE;
OV_Y`u7YR }
nK)U.SZ …… //其它处理及默认处理
"FwbhD0Gb }
JUt
7 7H %>\^A^ # 4L[8(+V 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
q
okgu$2 L
Me{5H 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
=rMT1 nm_]2z O 二、编程步骤
$0~H~- xlZ"F 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
D .oX>L#: 6*J`2U9Q 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Ep>3%{V :GBWQXb G 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
BxS\"W oJA%t-&%R 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
0&mOu #l 0&}
"!) 5、 添加代码,编译运行程序。
J\^ZRu_K )7l+\t 三、程序代码
L}T:Y). BT.;l I ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
8D@H4O. #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
a;WRTV #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
=iO K($ #if _MSC_VER > 1000
'/trM %< #pragma once
.$pW?C 3e #endif // _MSC_VER > 1000
.&:y+Oww~ #ifndef __AFXWIN_H__
|2z?8lx #error include 'stdafx.h' before including this file for PCH
mtu/kd'( #endif
>~8;H x].d #include "resource.h" // main symbols
pC2ZN class CHookApp : public CWinApp
CZe0kH^:{ {
RY3ANEu+ public:
Vf9PHHH| CHookApp();
{/#^v?, // Overrides
>qk[/\^O // ClassWizard generated virtual function overrides
rf^Q%ds //{{AFX_VIRTUAL(CHookApp)
MB06=N public:
%{WZ virtual BOOL InitInstance();
EhL
8rR virtual int ExitInstance();
`?r]OVe{y //}}AFX_VIRTUAL
_H@Y%"ZHJ6 //{{AFX_MSG(CHookApp)
6;6a.iZ // NOTE - the ClassWizard will add and remove member functions here.
qkVGa%^ // DO NOT EDIT what you see in these blocks of generated code !
PLD6Ug //}}AFX_MSG
QWz5iM DECLARE_MESSAGE_MAP()
a$H*C(wL };
D;VQoO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
&/R`\(hEA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
qKNX^n; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
VO r*YB& BOOL InitHotkey();
mO<sw BOOL UnInit();
^K*uP^B= #endif
k`FCyO C%_^0#8-0 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
2NHuZ.af #include "stdafx.h"
\i_y(; #include "hook.h"
AT Dm$ * #include <windowsx.h>
hp=TWt~ #ifdef _DEBUG
WwG +Xa #define new DEBUG_NEW
l,AK #undef THIS_FILE
O92a*) static char THIS_FILE[] = __FILE__;
<q|IP_ #endif
e[_W( v #define MAX_KEY 100
:&:IZkO #define CTRLBIT 0x04
%{qJkjG #define ALTBIT 0x02
NJK?5{H' #define SHIFTBIT 0x01
hpp>+= #pragma data_seg("shareddata")
Xb +)@Y4h HHOOK hHook =NULL;
b[p<kMTir UINT nHookCount =0;
;ELQIHnD" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
DwM4/m static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
(}E-+:vFU static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
uX_A4ht* static int KeyCount =0;
.
+_IpygQ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
GtI]6t #pragma data_seg()
j$r .&,m HINSTANCE hins;
CY2DxP % void VerifyWindow();
iC- ?F
cA BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
18JhC*in //{{AFX_MSG_MAP(CHookApp)
0=Jf93D5 // NOTE - the ClassWizard will add and remove mapping macros here.
^,S\-Uy9 // DO NOT EDIT what you see in these blocks of generated code!
d.y2`wT //}}AFX_MSG_MAP
eveGCV;@ END_MESSAGE_MAP()
b(&~f@%| +LddW0h+=8 CHookApp::CHookApp()
q)JG_Y.p {
K^z-G=|N // TODO: add construction code here,
qT]Bl+h2 // Place all significant initialization in InitInstance
iw1((&^)" }
Yc;cf%c1 T{=.mW^ x CHookApp theApp;
N}{CL(xi LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/E>z8J$ {
OdX-.FFl BOOL bProcessed=FALSE;
0_JbE if(HC_ACTION==nCode)
SPKen}g {
cGSoAK if((lParam&0xc0000000)==0xc0000000){// Key up
il^SGH switch(wParam)
pKK&+umg {
0[6llcuj case VK_MENU:
cyUNJw MaskBits&=~ALTBIT;
7Cf%v`B4D break;
FI@2KM case VK_CONTROL:
^9T6Ix{= MaskBits&=~CTRLBIT;
^Q8m)0DP break;
n=v4m_e case VK_SHIFT:
it!i'lG MaskBits&=~SHIFTBIT;
!fdni}f) break;
{#M=gDhbX default: //judge the key and send message
u:H@]z(x break;
9_IR%bm }
Bu?"b=B* for(int index=0;index<MAX_KEY;index++){
!v\m%t|. if(hCallWnd[index]==NULL)
5xW)nEV continue;
M52kau if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(zkh`8L {
@ [_I| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Db({k,P'Y bProcessed=TRUE;
GEP YSp }
'N,3]Soi }
2L.UEAt }
|E@G sw else if((lParam&0xc000ffff)==1){ //Key down
JA7HO| switch(wParam)
6 .DJRY {
g-xbb&] case VK_MENU:
;@K,>$ur- MaskBits|=ALTBIT;
G[u_Uu=> break;
W.p->,N case VK_CONTROL:
$I_04k#t MaskBits|=CTRLBIT;
s<0yQ-=.?N break;
>VP\@xt(R[ case VK_SHIFT:
YlOYgr^ MaskBits|=SHIFTBIT;
W#'c6Hq2c break;
&:L8; m default: //judge the key and send message
{neE(0c break;
9BLz }
tjk Y[ for(int index=0;index<MAX_KEY;index++)
*sf9(%j {
] d| -r:4 if(hCallWnd[index]==NULL)
o)n8,k&nm continue;
"Ks%! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!Dkz6B* {
mh44 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
d%9I*Qo0, bProcessed=TRUE;
sAk~`(:4! }
'.~vN L+
O }
@FkNT~OZ }
O60j C;{F if(!bProcessed){
S$%/9^\jF for(int index=0;index<MAX_KEY;index++){
` 2|~Z
H if(hCallWnd[index]==NULL)
.&7=ZY>E continue;
/0SG if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&{&lCBN SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
H*|Bukgt/M }
&.kg8|s{ }
f&`v-kiAn= }
)Tngtt D return CallNextHookEx( hHook, nCode, wParam, lParam );
9 N=KU }
[gzU/: UE7P =B BOOL InitHotkey()
D]y6*Ha {
}3:TPW5S if(hHook!=NULL){
eJ{"\c( nHookCount++;
g^)> -$= return TRUE;
2EE/xnwX }
2 )RW*Qu;+ else
toTAWT D hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
\Qk:\aLR if(hHook!=NULL)
9Lz)SYd nHookCount++;
Vu`dEvL? return (hHook!=NULL);
o~P8=1t }
8f^URN<x BOOL UnInit()
l0D.7>aj {
[$[t.m if(nHookCount>1){
~R)w
9uq nHookCount--;
58e{WC return TRUE;
^0{S!fs }
*B:{g>0 BOOL unhooked = UnhookWindowsHookEx(hHook);
n^&QOII@> if(unhooked==TRUE){
R~RY:[5?w nHookCount=0;
*kyy''r hHook=NULL;
8" 8{Nf-" }
xDADJ>u2K return unhooked;
m$LZ3=v%8 }
W\~ZmA. "r"]NyM BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
T>f-b3dk {
)STt3. BOOL bAdded=FALSE;
S"3g 1yU^_ for(int index=0;index<MAX_KEY;index++){
;SC|VcbyH if(hCallWnd[index]==0){
$Uewv
+ hCallWnd[index]=hWnd;
6w1:3~a HotKey[index]=cKey;
vMRKs#&8 HotKeyMask[index]=cMask;
LiV]!*9$KG bAdded=TRUE;
KMbBow3o*~ KeyCount++;
bjT0Fi0- break;
A5H[g`& }
!uO|T'u0a }
e:7aVOm return bAdded;
;'o>6I7Ph }
?N|PgNu X @XIwp2A{+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'.kbXw0} {
*;gi52tM BOOL bRemoved=FALSE;
R:ar85F for(int index=0;index<MAX_KEY;index++){
7H>dv' if(hCallWnd[index]==hWnd){
^Ws~h\{% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
|g;XC^!%=o hCallWnd[index]=NULL;
,RT\&Ze5 HotKey[index]=0;
{?L}qV HotKeyMask[index]=0;
[e^i". bRemoved=TRUE;
@~N#)L^ KeyCount--;
El+]}D" break;
?5GjH~ }
3t_5Xacj }
/?6y2 t }
=G72`]#- return bRemoved;
9n%W-R. }
7olA@;$ 92tb`' void VerifyWindow()
QB@*/Le {
dkn_`j\v for(int i=0;i<MAX_KEY;i++){
X0P$r6 ; if(hCallWnd
!=NULL){ q;AQ6k(
if(!IsWindow(hCallWnd)){ tllg$CQ5
hCallWnd=NULL; e| l?NXRX
HotKey=0; bQeYFY#^
HotKeyMask=0; Ux<h`
s
KeyCount--; D0]9
-h
} SMy&K[hJ[
} ]E3g8?L
} ;kF p)*i
} 23fAc"@ B
9"aTF,'F/
BOOL CHookApp::InitInstance() v m$v[
{ zld>o3K}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); gI%n(eY
hins=AfxGetInstanceHandle(); So 5{E4[
InitHotkey(); c~C W-%wN
return CWinApp::InitInstance(); i'u;"ot=
} 7xcYM
qqAsh]Z
int CHookApp::ExitInstance() !3&}r
{ h}d7M55#|
VerifyWindow(); =0-qBodbl
UnInit(); H9Z3.F(2
return CWinApp::ExitInstance(); E:tUbWVp
} NR [VGZj
?=G H{
%E
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m6gr!aT
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S`^W#,rj
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I"!{HnSG`
#if _MSC_VER > 1000 >fdN`W}M
#pragma once 0k>&MkM\^
#endif // _MSC_VER > 1000 6]3ZUH;
-,tYfQ;:
class CCaptureDlg : public CDialog ]aR4U`
{ Ij8tBT?jlL
// Construction e{O5y8,
public: :Ry24X
BOOL bTray; %qHT!aP
BOOL bRegistered; n"
~*9'
BOOL RegisterHotkey(); pWp2{G^XB
UCHAR cKey; ^/uGcz|.
UCHAR cMask; izw}25SW
void DeleteIcon(); ^`7t@G$ D
void AddIcon(); 4tU~ ^z
UINT nCount; ba ?k:b
void SaveBmp(); L_r &'B
CCaptureDlg(CWnd* pParent = NULL); // standard constructor N'1~ wxd
// Dialog Data >KPJ74R
//{{AFX_DATA(CCaptureDlg) ]4yvTP3[Rm
enum { IDD = IDD_CAPTURE_DIALOG }; O+$70
CComboBox m_Key; MocH>^,
BOOL m_bControl; &1{k^>oz
BOOL m_bAlt; ["M>
BOOL m_bShift; F~AS(sk
CString m_Path; 7y\g~?5N
CString m_Number; a*hThr+$M
//}}AFX_DATA X
A|`wAGP
// ClassWizard generated virtual function overrides z,)sS<t(
//{{AFX_VIRTUAL(CCaptureDlg) &^H
"T6
public: (`u!/
virtual BOOL PreTranslateMessage(MSG* pMsg); !;gke,fB
protected: m+UdT854
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4:'] 'E
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O m
//}}AFX_VIRTUAL m=}X$QF`^
// Implementation ~'MWtDe:Z8
protected: .B13)$C
HICON m_hIcon; G#:!wI
// Generated message map functions N 3c*S"1
//{{AFX_MSG(CCaptureDlg) }hYE6~pr
virtual BOOL OnInitDialog(); G,-OH-M!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j%;)CV
G"
afx_msg void OnPaint(); F21[r!3
afx_msg HCURSOR OnQueryDragIcon(); 7
L\?
virtual void OnCancel(); O:)IRB3
afx_msg void OnAbout(); HqBPY[;s
afx_msg void OnBrowse(); cloI 6%5r
afx_msg void OnChange(); ;l ()3;
//}}AFX_MSG DZRxp,
DECLARE_MESSAGE_MAP() RH Vv}N0
}; 3L?a4,Q"k}
#endif )yW_O:
lM*O+k
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file , ~xU>L^
#include "stdafx.h" vs|6ww
#include "Capture.h" &o@5%Rz2/
#include "CaptureDlg.h" PAV2w_X~
#include <windowsx.h> L0b]^_tI
#pragma comment(lib,"hook.lib") v:MS0]
#ifdef _DEBUG X.l"f'`l
#define new DEBUG_NEW ~q(C j"7
#undef THIS_FILE xm5FQ) T
static char THIS_FILE[] = __FILE__; 0t?<6-3`/
#endif tcEf
~|3
#define IDM_SHELL WM_USER+1 lO> 7`2x=F
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HF+fk*_Q
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ' u};z:t
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?]D+H%3[$i
class CAboutDlg : public CDialog o%PoSZZ
{ Z4ov
public: So%1RY{)
CAboutDlg(); G@EjWZQ
// Dialog Data sFCs_u1tNN
//{{AFX_DATA(CAboutDlg) j :Jdwf
enum { IDD = IDD_ABOUTBOX }; !a(qqZ|s
//}}AFX_DATA 0Y*gJ!a
// ClassWizard generated virtual function overrides ;n{j,HB
//{{AFX_VIRTUAL(CAboutDlg) w9<FX>@
protected: f^sb0nU
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HcVs(]tIW
//}}AFX_VIRTUAL +1jqCW
// Implementation RK:sQWG
protected: /{MH'
//{{AFX_MSG(CAboutDlg) efkie}
//}}AFX_MSG n3g
WMC
DECLARE_MESSAGE_MAP() lkWeQ)V
}; ((>3,%B`
vKf;&`^qE
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GnrW{o
{ zw0 r
i6
//{{AFX_DATA_INIT(CAboutDlg) W#7-%oT
//}}AFX_DATA_INIT ;:\,x
} lEbR) B,
il cy/
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1qKxg
{ k>;r9^D
CDialog::DoDataExchange(pDX); i-s?"Fk
//{{AFX_DATA_MAP(CAboutDlg) W<N QUf[=
//}}AFX_DATA_MAP 7K]U|K#
} D3AtYt
< Gy!i/
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) o p5^9`"
//{{AFX_MSG_MAP(CAboutDlg) DD6`k*RIk.
// No message handlers +6)kX4
//}}AFX_MSG_MAP C\2 >7
END_MESSAGE_MAP() pkV\D
|XA aKZA
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u:H 3.5)%
: CDialog(CCaptureDlg::IDD, pParent) i~Ob( YIH
{ ($ B]9*
//{{AFX_DATA_INIT(CCaptureDlg) ;7^j-6
m_bControl = FALSE; QRZTT qG
m_bAlt = FALSE; 9Glfi@.
m_bShift = FALSE; Ysc|kxLb
m_Path = _T("c:\\"); VDu
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m_Number = _T("0 picture captured."); aU]O$Pg{
nCount=0; p9 ,\ {Is
bRegistered=FALSE; bb0McEQy
bTray=FALSE; A"<)(M+kG
//}}AFX_DATA_INIT t k/K0u
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (zro7gKked
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nK%/tdq
} K-Dk2(x
L!b0y7yR
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k5%0wHpk =
{ +yP[(b/
CDialog::DoDataExchange(pDX); Q~Sv2
//{{AFX_DATA_MAP(CCaptureDlg) sHPwW5j/o'
DDX_Control(pDX, IDC_KEY, m_Key); NZ+?Ydr8k
DDX_Check(pDX, IDC_CONTROL, m_bControl); 'oHOFH9:{b
DDX_Check(pDX, IDC_ALT, m_bAlt); voej ~z+
DDX_Check(pDX, IDC_SHIFT, m_bShift); CWe>jlUQ
DDX_Text(pDX, IDC_PATH, m_Path); Zc\h15+P
DDX_Text(pDX, IDC_NUMBER, m_Number); 0O['-x
//}}AFX_DATA_MAP )3`
} #9hXZr/8
x [{q&N!"`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vu'!-K=0
//{{AFX_MSG_MAP(CCaptureDlg) J,0WQQnb
ON_WM_SYSCOMMAND() ND55`KT4
ON_WM_PAINT() vPl6Dasr
ON_WM_QUERYDRAGICON() _Dcc<-.
ON_BN_CLICKED(ID_ABOUT, OnAbout)
G_, t\
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k"^t?\Q%vI
ON_BN_CLICKED(ID_CHANGE, OnChange) .M53, 8X
//}}AFX_MSG_MAP ",aT<lw.
END_MESSAGE_MAP() qvfAG 0p
g"dZB2`C
BOOL CCaptureDlg::OnInitDialog() \l=KWa 3Q
{ Q1ABnacR
CDialog::OnInitDialog(); }2BH_
2
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [>M*_1F
ASSERT(IDM_ABOUTBOX < 0xF000); .iP G /e
CMenu* pSysMenu = GetSystemMenu(FALSE); zmL~]!~&
if (pSysMenu != NULL) ofPF}
{ |!xfIR>=F
CString strAboutMenu; X~)V )'R
strAboutMenu.LoadString(IDS_ABOUTBOX); TA@tRGP>
if (!strAboutMenu.IsEmpty()) 8F`BJ6='
{ O2'bNR
pSysMenu->AppendMenu(MF_SEPARATOR); ;( Ajf.i
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); RZ<+AX9R
} 9OQ0Yc!3
} sx-Hw4.a"
SetIcon(m_hIcon, TRUE); // Set big icon u.pKK
SetIcon(m_hIcon, FALSE); // Set small icon RP|>&I
m_Key.SetCurSel(0); 9HJ'p:{)
RegisterHotkey(); =_?pOq
CMenu* pMenu=GetSystemMenu(FALSE); Oj4u!SY\j
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Dc&9emKI
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _r<zSH%
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _,Rsl$Tk'
return TRUE; // return TRUE unless you set the focus to a control -e`oW.+
} V$-~%7@>;9
1|l)gfcP
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) VT5cxB<
{ <>T&ab@dE(
if ((nID & 0xFFF0) == IDM_ABOUTBOX) iBtjd`V*
{ 6<qwP?WN
CAboutDlg dlgAbout; O7'<I|aD
dlgAbout.DoModal(); f- k|w%R@
} cz7CrK~5
else 'd2qa`H'}B
{ y} $P,
CDialog::OnSysCommand(nID, lParam); %EJ\|@N:
}
pT3X/ra
} {w |dM#
T<TcV9vM
void CCaptureDlg::OnPaint() _X,[]+ziu%
{ /slm
]'
if (IsIconic()) *gM,x4 Y
{ ,TKs/-_?
CPaintDC dc(this); // device context for painting [w+h-q
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O2`oe4."vd
// Center icon in client rectangle PkPDVv
int cxIcon = GetSystemMetrics(SM_CXICON); |P,zGy
int cyIcon = GetSystemMetrics(SM_CYICON); "'z,[v50&
CRect rect; c%AFo]H
GetClientRect(&rect); M1/M}~
int x = (rect.Width() - cxIcon + 1) / 2; ;0w ^ud
int y = (rect.Height() - cyIcon + 1) / 2; rP^TN^bd|
// Draw the icon 2qs>Bshf
dc.DrawIcon(x, y, m_hIcon); H[BD)
} .pS&0gBo\
else PcHSm/d0e
{ ~7lTqY\
CDialog::OnPaint(); %1-K);SJ
} e-CNQnO~
} X$7Oo^1;
,67"C2Y
HCURSOR CCaptureDlg::OnQueryDragIcon() v"P&`1=T
{ 74@lo-/LY
return (HCURSOR) m_hIcon; KP[NuXA`
} KGV.S
8)^B32
void CCaptureDlg::OnCancel() ^[{`q9A#d
{ K3vseor
if(bTray) v229H<
DeleteIcon(); _ztZ>'
CDialog::OnCancel(); ,op]-CY5
} g>2aIun_Q
0dgP
void CCaptureDlg::OnAbout() b]!9eV$
{ *4<4
CAboutDlg dlg; s?QVX~S"
dlg.DoModal(); C`\9cej
} YBb)/ZghY
6g5PM4\
void CCaptureDlg::OnBrowse() ,:D=gQ@`
{ FJP< bREQ
CString str; ^4c,U9J=
BROWSEINFO bi; 0U$:>bQ
char name[MAX_PATH]; e^j<jV`1
ZeroMemory(&bi,sizeof(BROWSEINFO)); c_
La^HS
bi.hwndOwner=GetSafeHwnd(); r55qmPhg
bi.pszDisplayName=name; y }\r#"Z`
bi.lpszTitle="Select folder"; x^A7'ad0
bi.ulFlags=BIF_RETURNONLYFSDIRS; ""co6qo#>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1HMUHZT
if(idl==NULL) ;Vg^!]LL#
return; >(X#<`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ev9;Ld
str.ReleaseBuffer(); 7ftR4
m_Path=str; ~12_D'8D[
if(str.GetAt(str.GetLength()-1)!='\\') 1N8;)HLIBJ
m_Path+="\\"; !; IJ
UpdateData(FALSE); qu_)`wB
} v=!YfAn
nqT> qS[Z
void CCaptureDlg::SaveBmp() }91*4@B7
{ v?L
CDC dc; m6^ 5S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ipobr7G.SD
CBitmap bm; 089 k.WG
int Width=GetSystemMetrics(SM_CXSCREEN); e}c&LDgU
int Height=GetSystemMetrics(SM_CYSCREEN); `ncNEHh7K
bm.CreateCompatibleBitmap(&dc,Width,Height); \)OEBN`9#
CDC tdc; !xu9+{-
tdc.CreateCompatibleDC(&dc); cFK @3a
CBitmap*pOld=tdc.SelectObject(&bm); *i^`Dw^~y
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h4_b!E@
tdc.SelectObject(pOld); |( G2K'Ab
BITMAP btm; vA=Z=8
bm.GetBitmap(&btm); yGxv?%%2
DWORD size=btm.bmWidthBytes*btm.bmHeight; (&jW}1D
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yub{8 f;v
BITMAPINFOHEADER bih; v5_7r%Hiw
bih.biBitCount=btm.bmBitsPixel; "+)K |9T#
bih.biClrImportant=0; OOnX`
bih.biClrUsed=0; g+xw$A ou
bih.biCompression=0; 3X;{vO\a1
bih.biHeight=btm.bmHeight; ad9CsvW
bih.biPlanes=1; W^es;5
bih.biSize=sizeof(BITMAPINFOHEADER); VPt9QL(
bih.biSizeImage=size; 4:7m K/Z
bih.biWidth=btm.bmWidth; {^#2=`:)O
bih.biXPelsPerMeter=0; ?c]n^GvG
bih.biYPelsPerMeter=0; Q$~n/
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [:iv4>ZZ
static int filecount=0; 3GF2eS$$P
CString name; &SH1q_&BQ
name.Format("pict%04d.bmp",filecount++); +L0w;w T
name=m_Path+name; zvY+R\,in
BITMAPFILEHEADER bfh; qi(*ty
bfh.bfReserved1=bfh.bfReserved2=0; b7HffO O
bfh.bfType=((WORD)('M'<< 8)|'B'); d H?
ScXM=
bfh.bfSize=54+size; .Pe9_ZH$W
bfh.bfOffBits=54; ZtK\HDdp
CFile bf; PY`L$e
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1svi8wh
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9xFO]Y"
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Pao%pA.<
bf.WriteHuge(lpData,size); PFM'&;V
bf.Close(); ecj7BT[mLI
nCount++; Dzl;-]S
} MV0Lq:# N
GlobalFreePtr(lpData); +pf5\#l?
if(nCount==1) 7AwgJb hn
m_Number.Format("%d picture captured.",nCount); x({H{'9?
else ('C7=u&F
m_Number.Format("%d pictures captured.",nCount); =Q<L
eh=G
UpdateData(FALSE); tnz+bX26
} S QY"OBo<e
#aar9
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AVl~{k|
{ Wh(
|+rJ?Z
if(pMsg -> message == WM_KEYDOWN) x[Im%k
{ o31Nmy
Ni
if(pMsg -> wParam == VK_ESCAPE) \K
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return TRUE; H={&3poBz
if(pMsg -> wParam == VK_RETURN) ;apzAF
return TRUE; 2-'Opu
} $s\UL}Gc
return CDialog::PreTranslateMessage(pMsg); ;@3FF
} FS"eM"z
a.@qGsIH
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F%d\~Vj
{ c~=B0K-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X^@I].
SaveBmp(); &QNY,Pj
return FALSE; zR;X*q"T$4
} ?4 S+edX
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]Mi.f3QlO6
CMenu pop; yxt[=
C
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F_;DN:
{
CMenu*pMenu=pop.GetSubMenu(0); l[GOs&D1
pMenu->SetDefaultItem(ID_EXITICON); jS.g]k
CPoint pt;
\
%=9
GetCursorPos(&pt); F {+`uG
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r?/A?DMe
if(id==ID_EXITICON) "O[j!fG8,
DeleteIcon(); tV;`fV
else if(id==ID_EXIT) 44ed79ly0)
OnCancel(); ZR0r>@M3v<
return FALSE; 7nU6k%_ %
} R\|lt)h
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n5-)/R[z
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9BEFr/.
AddIcon(); '8 Ztj
return res; Ih}1%Jq
} p d[ncL
V'Kgdj
void CCaptureDlg::AddIcon() A3N]8?D
{ P>ceeoYQuA
NOTIFYICONDATA data; R6-n IY,
data.cbSize=sizeof(NOTIFYICONDATA); >EsziRm
CString tip; MPgS!V1
tip.LoadString(IDS_ICONTIP); hU]HTX'R
data.hIcon=GetIcon(0); Ny- [9S-<
data.hWnd=GetSafeHwnd(); O,2~"~kF
strcpy(data.szTip,tip); b2,mCfLsv
data.uCallbackMessage=IDM_SHELL; A-
YBQPE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (>4aibA'P
data.uID=98; X~=xXN.
Shell_NotifyIcon(NIM_ADD,&data); ltB.Q
ShowWindow(SW_HIDE); uMb>xxf
bTray=TRUE; WEg6Kz
} m([(:.X/IX
"\W-f
void CCaptureDlg::DeleteIcon() =J-5.0Q\_\
{ kum#^^4G|
NOTIFYICONDATA data; ^N}Wnk7ks'
data.cbSize=sizeof(NOTIFYICONDATA); b-U
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data.hWnd=GetSafeHwnd(); OO dSKf8
data.uID=98; @`opDu!
Shell_NotifyIcon(NIM_DELETE,&data); $
,SF@BhO
ShowWindow(SW_SHOW); X,aYK;q%z
SetForegroundWindow(); u's`*T@.
ShowWindow(SW_SHOWNORMAL); \!vN
bTray=FALSE; *[ #;j$m
} 2kAx>R
S{4z?Ri, '
void CCaptureDlg::OnChange() ?\KM5^eX
{ 99$
5`R;
RegisterHotkey(); n\Fp[9+Z\
} &AVpLf:?
{t"+
3zy'
BOOL CCaptureDlg::RegisterHotkey() Oa;X+
{ EN{]Qb06A
UpdateData(); !Cgx.
UCHAR mask=0; " 96yp4v@
UCHAR key=0; ]<(]u#g_d
if(m_bControl) e^4 p%
mask|=4; a?|vQ*W
if(m_bAlt) Xs&TJ8a
mask|=2; IK,|5] *Ar
if(m_bShift) Zwcy4>8
mask|=1; >Vy>O&r
key=Key_Table[m_Key.GetCurSel()]; 21s4MagC
if(bRegistered){ UYk>'\%H0
DeleteHotkey(GetSafeHwnd(),cKey,cMask); w-Nhs6
bRegistered=FALSE;
Ol"3a|
} MuoF FvAA
cMask=mask; g%F"l2M
cKey=key; g(VNy@
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); } VJfJ/
return bRegistered; vZ/6\Cz
} *k"|i*{
43?^7_l-
四、小结 JN^&S
f\'{3I29
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。