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:
_1VtVfiZ{
rgWGe6;! 一、实现方法
CD:@OI J0~Ha u 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:
Qb!9QlW ^PMP2\JQA #pragma data_seg("shareddata")
22a$//}E HHOOK hHook =NULL; //钩子句柄
O{y2tz3 UINT nHookCount =0; //挂接的程序数目
~N&j6wHg# static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
|
y\B*P static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
MW=2GhD= static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\(R(S!xr_
static int KeyCount =0;
\h~;n)FI static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Ratg!l|'- #pragma data_seg()
8j. 9Sk/ 8sOM%y9M 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。
?_3K]i1IS P
1X8 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:
`r
&IA >j{phZ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
DB-4S-2 cKey,UCHAR cMask)
we9R4*j {
x>8=CiUE BOOL bAdded=FALSE;
9He>F7J:p' for(int index=0;index<MAX_KEY;index++){
@@9#odO if(hCallWnd[index]==0){
)f>s\T hCallWnd[index]=hWnd;
Xhe2 5 HotKey[index]=cKey;
MR=>DcR HotKeyMask[index]=cMask;
]7}2"?J4v bAdded=TRUE;
]xBQ7Xqf| KeyCount++;
0.4c|-n break;
&Y;z[+(P }
6Daz1Pxd+ }
~T7\lJ{%G return bAdded;
3rhH0{ }
V7.xKmB //删除热键
u* G|TF BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CS"2Sd 1` {
y+\nj3v6 BOOL bRemoved=FALSE;
~rN~Ql%S for(int index=0;index<MAX_KEY;index++){
a$.(Zl if(hCallWnd[index]==hWnd){
f'Dl*d if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
v?F~fRH hCallWnd[index]=NULL;
}:P/eY HotKey[index]=0;
W2J"W=:z HotKeyMask[index]=0;
}bz v&k bRemoved=TRUE;
X3
D(2W KeyCount--;
a938l^@;s8 break;
rIR~YMv! }
R@-rc|FunJ }
glbU\K> > }
_[zO?Div[ return bRemoved;
/\"=egB9 }
-&oJ@Aa `ySLic` B v/]>Z DLL中的钩子函数如下:
);$_|]# h1} x2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>y#<WB$i {
Q9=X| BOOL bProcessed=FALSE;
{.v- if(HC_ACTION==nCode)
f5<qF ]Y/ {
USy^Y?~; if((lParam&0xc0000000)==0xc0000000){// 有键松开
]f=108|8 switch(wParam)
P#-Ye<V~J( {
d#cw`h<c~ case VK_MENU:
a^t#kdT MaskBits&=~ALTBIT;
ZgVYC4=Q-\ break;
p@!{Sh case VK_CONTROL:
_@wXh-nc MaskBits&=~CTRLBIT;
L6c=uN break;
U@yn%k9 case VK_SHIFT:
[GJ_]w^}j MaskBits&=~SHIFTBIT;
| z=:D*uh~ break;
vzA)pB~; default: //judge the key and send message
Dp4\rps break;
%GQPiWu }
nm2bBX,fh for(int index=0;index<MAX_KEY;index++){
?a+>%uWt if(hCallWnd[index]==NULL)
UM%]A'h2O" continue;
l?LwQmq6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o Y{L0B[ {
*}DCxv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&[ejxK" bProcessed=TRUE;
2'UWPZgE }
Rqu_[M }
g0NtM%
}
s ki'I else if((lParam&0xc000ffff)==1){ //有键按下
J@ZIW%5 switch(wParam)
60(j[d-$p {
6O uB}* case VK_MENU:
E-\Wo3 MaskBits|=ALTBIT;
E9JxntX break;
_0p8FhNt case VK_CONTROL:
RGvfy/T MaskBits|=CTRLBIT;
[Zc8tE2oN break;
/@-!JF#g case VK_SHIFT:
Ey7SQb MaskBits|=SHIFTBIT;
w'E&w)Z] break;
S) ZcH default: //judge the key and send message
h3U| ~h break;
H=O/w3 }
CmKbpN* for(int index=0;index<MAX_KEY;index++){
1{{z[w# if(hCallWnd[index]==NULL)
ZqH.$nXP continue;
NN\>(
= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a~jU~('4}w {
tGv5pe*r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Tl>D=Vnhh bProcessed=TRUE;
3BHPD;U }
ErmlM#u }
;zk& 7P0 }
[vCZoG8+> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
k'Is]=3 for(int index=0;index<MAX_KEY;index++){
Q'D%?Vg' if(hCallWnd[index]==NULL)
6jz6
continue;
xe9E</M_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
SbS*z: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
oZm)@Vv; //lParam的意义可看MSDN中WM_KEYDOWN部分
&p|+K
XIf }
K@yLcgr{O2 }
p,#t[K }
ypyqf55gK return CallNextHookEx( hHook, nCode, wParam, lParam );
N 0<([B; }
Yl}'hRp +ZOjbI) 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:
tbMf_-g 5qZebD2a BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
zl8O @g BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
lsJl+%&8 V?pqKQL0 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:
vKrOIBP K[{hh;7 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
dQW=k^X 'U {
|qe[`x;
% if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
G':wJ7[]` {
Q>OBK&' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
y~eQVnH5W SaveBmp();
Xm#rkF[, return FALSE;
'YKyY:eZ }
J)7m::%I …… //其它处理及默认处理
s}3g+T\l1w }
DAYR=s /qf(5Bm |AD"}8 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。
vlW521 ITpo:"X g 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。
)T2V<3l w4I&SLm-b 二、编程步骤
\.!+'2!m e3T&KyPm?+ 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";
N>a. dYXr wg-qq4Q\ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
(^),G-] .AHf]X0 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;
al#BfcZW =17d7#- 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;
R9+0ZoS 8s+9PE 5、 添加代码,编译运行程序。
lk/T|0]) 'c]Fhe fb 三、程序代码
"INIP? 'BUix!k0< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
(%N=7? #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`LroH>_ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
/sU~cn^D5 #if _MSC_VER > 1000
MZ$x(Vcj #pragma once
ERka l7+ #endif // _MSC_VER > 1000
>oD,wSYV~ #ifndef __AFXWIN_H__
c\P,ct
}> #error include 'stdafx.h' before including this file for PCH
X%>nvp #endif
'.{tE* #include "resource.h" // main symbols
zeqwmV= class CHookApp : public CWinApp
v,}Mn7: {
$%:=;1Jl public:
V=
wWY*C CHookApp();
5)@UpcjUA // Overrides
=qWcw7!" // ClassWizard generated virtual function overrides
A-6><X's6 //{{AFX_VIRTUAL(CHookApp)
g]$e-X@k public:
P0 4Q_A virtual BOOL InitInstance();
| XGj97#M virtual int ExitInstance();
W%&gvZre. //}}AFX_VIRTUAL
NUN~T ( //{{AFX_MSG(CHookApp)
4`X]$. // NOTE - the ClassWizard will add and remove member functions here.
b7uxCH]Z
// DO NOT EDIT what you see in these blocks of generated code !
Cf~vT" //}}AFX_MSG
)I{~Pcq DECLARE_MESSAGE_MAP()
R(t1Ei.-? };
Z=KHsMnB LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
\86:f<)P BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
GZq~Pl BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7M.TLV!f] BOOL InitHotkey();
A
)q=.C#e BOOL UnInit();
)(/Bw&$ #endif
fK
4,k:YC [@_IUvf^. //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
~DL-@*& #include "stdafx.h"
7=wPd4
#include "hook.h"
Jn\@wF9xd #include <windowsx.h>
>?L)+*^ #ifdef _DEBUG
~9We)FvU4 #define new DEBUG_NEW
S\poa:D` #undef THIS_FILE
f,(@K% static char THIS_FILE[] = __FILE__;
6,raRg6 #endif
<(E9U. #define MAX_KEY 100
6Cpn::WW} #define CTRLBIT 0x04
QJH(( #define ALTBIT 0x02
}VU7wMk #define SHIFTBIT 0x01
Can:!48 #pragma data_seg("shareddata")
4 (>8tP\Y HHOOK hHook =NULL;
hy}n&h UINT nHookCount =0;
n/ CP2A static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
V\m51H1mqo static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[QZ8M@Gty# static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/EvnwYQy static int KeyCount =0;
l0&U7gr static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
p|`[8uY? #pragma data_seg()
K%@#a}kRb HINSTANCE hins;
Ib}~Q@?2 void VerifyWindow();
J|uSj/8 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
S-7ryHH*0 //{{AFX_MSG_MAP(CHookApp)
_(_U= // NOTE - the ClassWizard will add and remove mapping macros here.
By;{Y[@rS // DO NOT EDIT what you see in these blocks of generated code!
.
g8WMm //}}AFX_MSG_MAP
{P7 I<^, END_MESSAGE_MAP()
k:yrh:JhB C"cBlru8B CHookApp::CHookApp()
QUb#84 {
3E$h
W // TODO: add construction code here,
EmYu]"${1 // Place all significant initialization in InitInstance
;\],R.! }
(L
8V)1N gk^`-`P CHookApp theApp;
3d;w\#?L; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1,Uf-i {
C'&t@@: BOOL bProcessed=FALSE;
_08y; _S if(HC_ACTION==nCode)
b/g~;| < {
&eIwlynm if((lParam&0xc0000000)==0xc0000000){// Key up
f1wwx|b%. switch(wParam)
Y![//tg {
3FQXp case VK_MENU:
N
6t `45 MaskBits&=~ALTBIT;
A4IPd break;
@~j--L case VK_CONTROL:
o%3VE8- MaskBits&=~CTRLBIT;
j\%m6\{n| break;
=|O><O| case VK_SHIFT:
Sd?+j;/" MaskBits&=~SHIFTBIT;
cS;O]>/5 break;
y"nL9r.,: default: //judge the key and send message
+V,Ld&r break;
pP^"p"<s }
<=gf|( for(int index=0;index<MAX_KEY;index++){
a-Ne!M[ if(hCallWnd[index]==NULL)
3IYbgUG continue;
rrc>O*>{i if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[W--%=Ou {
]D\p<4uepM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x)prI6YMv\ bProcessed=TRUE;
yoVN|5 }
[h@MA| }
NB.&J7v }
Z*kZUx7I< else if((lParam&0xc000ffff)==1){ //Key down
rT!9{uK switch(wParam)
an`
GY& {
K/D,sH! case VK_MENU:
q@%9Y3 MaskBits|=ALTBIT;
D]zpG break;
/e50&]2w case VK_CONTROL:
Jo9!:2? MaskBits|=CTRLBIT;
=G-u "QJ6 break;
E|BiK case VK_SHIFT:
tRzo}_+N MaskBits|=SHIFTBIT;
#e5*Dr8 break;
-) \!@n0 default: //judge the key and send message
|7wiwdD" break;
a^MR"i>@G }
V1>>]]PS for(int index=0;index<MAX_KEY;index++)
(IIOVv
1J {
=:pN82.G if(hCallWnd[index]==NULL)
.,( ,< continue;
}c;h:CE# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bl-t>aO*.V {
:taRCh5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
[.*o<
KP bProcessed=TRUE;
P(XNtQ= K }
fH[:S9@ }
!|;w(/ }
M$AQZ')9 if(!bProcessed){
i'NN for(int index=0;index<MAX_KEY;index++){
pTzfc`~xv if(hCallWnd[index]==NULL)
n$YCIW)0 continue;
?Ulc`-d if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T7!=KE_z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
n+;PfQ| }
#zv'N }
Xn:ac^ }
(??|\
&DTi return CallNextHookEx( hHook, nCode, wParam, lParam );
`Ef&h V }
4j
h4 XdH y1zep\-D BOOL InitHotkey()
fP
5!`8 {
dL!K''24{ if(hHook!=NULL){
p!w}hB598 nHookCount++;
k.CHMl] return TRUE;
> [|SF%
}
s7#|'jhZt else
DozC> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
uyDYS if(hHook!=NULL)
4!r>
^a nHookCount++;
q'p>__Ox return (hHook!=NULL);
dwt<s[k }
V7
dAB,: BOOL UnInit()
)B'U_* {
#pz{, if(nHookCount>1){
ofA6EmQ37 nHookCount--;
r]vD] return TRUE;
*cn#W]AE }
v^_<K4N` BOOL unhooked = UnhookWindowsHookEx(hHook);
tHo0q<.oX if(unhooked==TRUE){
5`3f"(ay/ nHookCount=0;
.5m^)hi hHook=NULL;
|uE_aFQs }
X@7K#@5 return unhooked;
4MOA}FZ~ }
,.+"10=N. D3emO'`gQ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ev\kq>2O {
K-}'Fiq BOOL bAdded=FALSE;
tFd^5A* for(int index=0;index<MAX_KEY;index++){
6}6ky9 if(hCallWnd[index]==0){
]m(5>h# hCallWnd[index]=hWnd;
T\h_8 HotKey[index]=cKey;
v1j]&3O HotKeyMask[index]=cMask;
xR,;^R|C bAdded=TRUE;
R.)U<`| | KeyCount++;
SEXLi8;/ break;
i#~1|2 }
9N'um%J3%s }
r,4V SyZF\ return bAdded;
9/k?Lv }
(d C<N3 &sx|sLw) BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|k4ZTr]? {
db!2nImNu\ BOOL bRemoved=FALSE;
T7.u7@V2 for(int index=0;index<MAX_KEY;index++){
`|^<y.-6 if(hCallWnd[index]==hWnd){
E4'D4@\W if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
'#.:%4 hCallWnd[index]=NULL;
B&m?3w HotKey[index]=0;
6YZ&>`a^ HotKeyMask[index]=0;
,b@0Qa" bRemoved=TRUE;
/m;w~-N KeyCount--;
Vy:ER break;
*/L;6_ }
NW9k.D% }
e-os0F }
^IGTGY]s return bRemoved;
H\3CvFm }
m(3bO[u1
1Nk}W!v void VerifyWindow()
vN7ihe[C {
{fMrx1 for(int i=0;i<MAX_KEY;i++){
'ej{B0rE if(hCallWnd
!=NULL){ Sg<''pUh
if(!IsWindow(hCallWnd)){ *3<m<<>U
hCallWnd=NULL; FJ}QKDQW=
HotKey=0; ':!;6v|L
HotKeyMask=0; uu>[WFh
KeyCount--; 'eo2a&S2D
} 00G[`a5
} QLH
s 3eM
} ii*Ty!Sa
} i
c]f o
*qG=p`
BOOL CHookApp::InitInstance() j>s%q.
{ ,7M9f
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1{"fmV
hins=AfxGetInstanceHandle(); F
,{nG[PL
InitHotkey(); 3@}HdLmN|
return CWinApp::InitInstance(); N_VAdNJ^:
} PSHs<Z47
,oP-:q!PC
int CHookApp::ExitInstance() ^%d+nKx9nL
{ \FTvN
VerifyWindow(); hpXu3o7e
UnInit(); EW4XFP4
c
return CWinApp::ExitInstance(); #IBBaxOk
} 4:<0i0)5
9~,eu
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oUw-l_ M]
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) IFPywL{K
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ TL7-uH
#if _MSC_VER > 1000 ^@)/VfVg
#pragma once aXC`yQ?
#endif // _MSC_VER > 1000 )hQNIt3o_
x el&8 `
class CCaptureDlg : public CDialog ~.x!st}
{ @-b}iP<T
// Construction H[,.nH_>+
public: >M:5yk@
BOOL bTray; 8d)F#
BOOL bRegistered; [1nI%/</>
BOOL RegisterHotkey(); fJE ki>1
UCHAR cKey; ooZ7HTP|
UCHAR cMask; $zmES tcm
void DeleteIcon(); v,|;uc+
void AddIcon(); FcW ?([l
UINT nCount; Vn/6D[}Tu
void SaveBmp(); &7DE$ S
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;5Sr<W\:;
// Dialog Data 5Ij_$a
//{{AFX_DATA(CCaptureDlg) i]$d3J3
enum { IDD = IDD_CAPTURE_DIALOG }; V7[qf "
CComboBox m_Key; (Z,,H1L
BOOL m_bControl; j9u-C/Q\r
BOOL m_bAlt; ;v0sM*x%V
BOOL m_bShift; Z=F=@ <!
CString m_Path; Wt3\&.n
CString m_Number; 6!"15dPN
//}}AFX_DATA N M8F
// ClassWizard generated virtual function overrides Z@ws,f^e
//{{AFX_VIRTUAL(CCaptureDlg) v8%]^` '
public: i^IvT
virtual BOOL PreTranslateMessage(MSG* pMsg); KFV]2mFN
protected: wqGZkFg1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2tr2:PB`
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pb{P[-f
//}}AFX_VIRTUAL tIr66'8
// Implementation t'Q48QAb?
protected: _ _)Z Q
HICON m_hIcon; IeU.T@ $
// Generated message map functions x9_ Lt4
//{{AFX_MSG(CCaptureDlg) X2e|[MWkp
virtual BOOL OnInitDialog(); s{q2C}=$?D
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Pdn.c1[-a
afx_msg void OnPaint(); v;$^1 I
afx_msg HCURSOR OnQueryDragIcon(); +bO{UC[
virtual void OnCancel(); 8Peqm?{5Y5
afx_msg void OnAbout(); bm+ Mr
afx_msg void OnBrowse(); DSjo%Brd-
afx_msg void OnChange(); q$t& *O_
//}}AFX_MSG 0Hz3nd?v
DECLARE_MESSAGE_MAP() }]s~L9_z['
}; *TXq/
3g
#endif sJ?kp^!g
W"Rii]GK"
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O.$<Bf9
#include "stdafx.h" nu3 A'E`'k
#include "Capture.h" Z?x]HB`r
#include "CaptureDlg.h" ~0}eNz*
#include <windowsx.h> 'qM3.U
#pragma comment(lib,"hook.lib") q(r2\
#ifdef _DEBUG p5H Mg\hT
#define new DEBUG_NEW *"4<&F
S
#undef THIS_FILE Rxli;blzi
static char THIS_FILE[] = __FILE__; x9ws@=[:
#endif 0?:ZER v
#define IDM_SHELL WM_USER+1 ]t=>#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u3ZG;ykM
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Fu`g)#Z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'RA[_Z
class CAboutDlg : public CDialog e!-'O0-Kw
{ E+2y-B)E
public: Z~nl{P#
CAboutDlg(); };+s0:H
// Dialog Data zyR pHM$E
//{{AFX_DATA(CAboutDlg) -12v/an]L7
enum { IDD = IDD_ABOUTBOX }; 1=D!C lcb
//}}AFX_DATA g/@C ESfm'
// ClassWizard generated virtual function overrides 67g/(4 &
//{{AFX_VIRTUAL(CAboutDlg) qQ_B[?+W
protected: iBi/9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L9kP8&&KK
//}}AFX_VIRTUAL )} #r"!
// Implementation ]d[q:N]z
protected: +|?c_vD
//{{AFX_MSG(CAboutDlg) 0I _;?i
//}}AFX_MSG a@a1/3
DECLARE_MESSAGE_MAP() Qm-P& g-
}; gky_]7Av
Q d./G5CC
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hnZHu\EJ
{ |}}]&:w2
//{{AFX_DATA_INIT(CAboutDlg) )6j:Mbz
//}}AFX_DATA_INIT +?<jSmGW
} g\.N>P@Bu
b#m47yTW9<
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Gs6#aL}]R
{ r%#qbsN
CDialog::DoDataExchange(pDX); ~4^e a
//{{AFX_DATA_MAP(CAboutDlg) g3Q #B7A
//}}AFX_DATA_MAP l}^#kHSyd
} 0%t|?@HoN
xH0/R LK3J
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3q>"#+R.t
//{{AFX_MSG_MAP(CAboutDlg) ,*4"d._Y
// No message handlers NLpD,q{
//}}AFX_MSG_MAP G#V22Wca8
END_MESSAGE_MAP() e>^R 8qM?
s`B'vyoaa
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) kMo)4Xp
: CDialog(CCaptureDlg::IDD, pParent) _e3'f:
{ $!f$R`R^Q\
//{{AFX_DATA_INIT(CCaptureDlg) h$&XQq0T
m_bControl = FALSE; =FbfV*K9
m_bAlt = FALSE; E;4a(o]{t
m_bShift = FALSE; ts]7 + 6V
m_Path = _T("c:\\"); x\DkS,O
m_Number = _T("0 picture captured."); ' 7A7HDJ
nCount=0; _#O?g=1
bRegistered=FALSE; FCWphpz
bTray=FALSE; JW\"S
//}}AFX_DATA_INIT +Xp;T`,v
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -AT@M1K7%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zT% kx:Fk
} @\y7
9FX
P1QJ'eC;T
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Kq$Zyf=E
{ ie!4z34
CDialog::DoDataExchange(pDX); `9+EhP$RS
//{{AFX_DATA_MAP(CCaptureDlg) 3EvA 5K.
DDX_Control(pDX, IDC_KEY, m_Key); #+;=ijyF
DDX_Check(pDX, IDC_CONTROL, m_bControl); taQ[>x7b
DDX_Check(pDX, IDC_ALT, m_bAlt);
T_uuFL
DDX_Check(pDX, IDC_SHIFT, m_bShift); 7|-xM>L$A
DDX_Text(pDX, IDC_PATH, m_Path); $ZRN#x@
DDX_Text(pDX, IDC_NUMBER, m_Number); >D<=9G(a
//}}AFX_DATA_MAP ;$QJnQ"R
} _&/Zab5
Z@ kC28
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mTfMuPPs[
//{{AFX_MSG_MAP(CCaptureDlg) uFm-HR@4
ON_WM_SYSCOMMAND() DVJc-.x8
ON_WM_PAINT() VO Qt{v{1|
ON_WM_QUERYDRAGICON() deoM~r9s
ON_BN_CLICKED(ID_ABOUT, OnAbout) .y/b$|d,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1,T9HpM
ON_BN_CLICKED(ID_CHANGE, OnChange) u
B\&
Q;
//}}AFX_MSG_MAP l8-jFeeMd
END_MESSAGE_MAP() k)p y\
|^Es6 .~
BOOL CCaptureDlg::OnInitDialog() }dUC^04
{ i!3K G|V
CDialog::OnInitDialog(); _kHpM :;.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %SGO"*_
ASSERT(IDM_ABOUTBOX < 0xF000); M9#QS`G
CMenu* pSysMenu = GetSystemMenu(FALSE); VK;x6*Y
if (pSysMenu != NULL) *u/|NU&X
{ wIF
":'
CString strAboutMenu; Y14R"*t~
strAboutMenu.LoadString(IDS_ABOUTBOX); $:[BB,$
if (!strAboutMenu.IsEmpty()) #!jRY!2Vt
{ >!1 f`
pSysMenu->AppendMenu(MF_SEPARATOR); s8[9YfuW
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4C%>/*%8>
} ?+5{HFx
} I_G>W3
SetIcon(m_hIcon, TRUE); // Set big icon iyYY)roB
SetIcon(m_hIcon, FALSE); // Set small icon h50StZ8Yr
m_Key.SetCurSel(0); *BsDHq-F~
RegisterHotkey(); `M ygDG+u
CMenu* pMenu=GetSystemMenu(FALSE); &8_;:
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Db=>7@h3C
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i4n
b#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &ZN'Ey?
return TRUE; // return TRUE unless you set the focus to a control s ;s-6%p
}
|WU`p
nnL$m_K~
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tR*W-%
{ _]UDmn[C
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9*;isMkq<
{ ;j U-<
CAboutDlg dlgAbout; -]\E}Ti
dlgAbout.DoModal(); df6Ν4L
} xzl4v=7
else Czr4
-#2
{ MLBg_<
CDialog::OnSysCommand(nID, lParam); kA%OF*%|6
} .k`*$1?73x
} s2?,' es
`B\KS*Gya#
void CCaptureDlg::OnPaint() : .o=F`W
{ =jIT"rk
if (IsIconic()) V`,[=u?c
{ n>:c}QAJH
CPaintDC dc(this); // device context for painting 8EG8!,\I
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); d Zz^9:C+
// Center icon in client rectangle 9/daRq$
int cxIcon = GetSystemMetrics(SM_CXICON); hcd>A vC8
int cyIcon = GetSystemMetrics(SM_CYICON); (1SO;8k\
CRect rect; _8li4;F
GetClientRect(&rect); 5**5b9bj-9
int x = (rect.Width() - cxIcon + 1) / 2; d]ZC8<`w
int y = (rect.Height() - cyIcon + 1) / 2; *{dD'9Bg
// Draw the icon d50IAa^p6J
dc.DrawIcon(x, y, m_hIcon); M.:@<S
} `s83rhs`!
else l8xd73D)8
{ +<\cd9
CDialog::OnPaint(); RA/ =w&
} 8U<.16+5Q
} mXU?+G0
Ag#5.,B-
HCURSOR CCaptureDlg::OnQueryDragIcon() KPjqw{gR_R
{ wGzXp5
dl
return (HCURSOR) m_hIcon; e0N=2i?I#z
} qa$[L@h>
nUud?F^_
void CCaptureDlg::OnCancel() jaO#><f
{ _c9
WWp?
if(bTray) !qXq
y}?w
DeleteIcon(); GQ-e$D@SfB
CDialog::OnCancel(); 0|s$vqc
} udEb/7ZL
c+b:K
void CCaptureDlg::OnAbout() DA MpR3
{ h w ;d m
CAboutDlg dlg; NkA6Cp[Q,1
dlg.DoModal(); I6hhU;)C
} ;;y@z[ >
0^!,[oh6*
void CCaptureDlg::OnBrowse() i. u15$
{ Ag>>B9
CString str; fb0T/JTw
BROWSEINFO bi; W}R=
char name[MAX_PATH]; +wz`_i)!
ZeroMemory(&bi,sizeof(BROWSEINFO)); [Yx-l;78
bi.hwndOwner=GetSafeHwnd(); /R(U>pZ
bi.pszDisplayName=name; 8g#
Y
bi.lpszTitle="Select folder"; 7o965h
bi.ulFlags=BIF_RETURNONLYFSDIRS; @8M'<tr<z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); tLXn?aNY
if(idl==NULL) F@_Egi
return; ##`;Eh0a
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); U/3e,`c
str.ReleaseBuffer(); nF. ;LM
m_Path=str; yo?g"vbE
if(str.GetAt(str.GetLength()-1)!='\\') &Qtp"#{
m_Path+="\\"; f=_Bx2ub
UpdateData(FALSE); UYcyk
$da
} dWW-tHv#
PK-}Ldj
void CCaptureDlg::SaveBmp() )-Mn"1ia
{ SA`J.4yn
CDC dc; } `>J6y9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,WO%L~db
CBitmap bm; t7*G91Hoq&
int Width=GetSystemMetrics(SM_CXSCREEN); =p,4=wo{
int Height=GetSystemMetrics(SM_CYSCREEN); =0s`4Y"+
bm.CreateCompatibleBitmap(&dc,Width,Height); *%Nns',
CDC tdc; f#;ubfi"z
tdc.CreateCompatibleDC(&dc); L_
Xn,
CBitmap*pOld=tdc.SelectObject(&bm); 4uO
@`0:x
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2[8fFo>
tdc.SelectObject(pOld); de=5=>P7
BITMAP btm; U5On-T5
bm.GetBitmap(&btm); =0PNHO\gl
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9{9#AI.G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }j5R@I6P
BITMAPINFOHEADER bih; /\ ,_P
bih.biBitCount=btm.bmBitsPixel; Io,/ +#|
bih.biClrImportant=0; kH>vD =q>
bih.biClrUsed=0; d6t)gG*5
bih.biCompression=0; H;TOPtt2
bih.biHeight=btm.bmHeight; +Dq|l}
bih.biPlanes=1; VGTeuu5i
bih.biSize=sizeof(BITMAPINFOHEADER); HC9vc,Fp
bih.biSizeImage=size; M]6w^\4j9
bih.biWidth=btm.bmWidth; c]%;^)
bih.biXPelsPerMeter=0; @o4z3Q@
bih.biYPelsPerMeter=0; zH=/.31Q
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -+
]T77r
static int filecount=0; jlRl2 #"
CString name; ,yHzo
name.Format("pict%04d.bmp",filecount++); Qb6QXjN
Q
name=m_Path+name; (6ohrM>Q
BITMAPFILEHEADER bfh; vk4C_8m
bfh.bfReserved1=bfh.bfReserved2=0; DJ1XNpm
bfh.bfType=((WORD)('M'<< 8)|'B'); b[{m>Fa+o#
bfh.bfSize=54+size; 4hsPbUx9
bfh.bfOffBits=54; Y91
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CFile bf; `zElBD
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Pg*?[^*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); abTDa6 /`v
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Edf=?K+\!i
bf.WriteHuge(lpData,size); g33<qYxP
bf.Close(); XI%RneuDr:
nCount++; +X* F<6mZ
} ' D)1ka.
GlobalFreePtr(lpData); K)Df}fVOc
if(nCount==1) KA|&Q<<{@
m_Number.Format("%d picture captured.",nCount); eHVdZ'%x
else r!=]Q}`F
m_Number.Format("%d pictures captured.",nCount); 3i]"#wK
UpdateData(FALSE); dl*_ m3T
} u|_LR5S!j
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) RlI
W&y
{ e/]O<, *
if(pMsg -> message == WM_KEYDOWN) c{'$=lR "
{ ys&"r":I
if(pMsg -> wParam == VK_ESCAPE) LCo1{wi
return TRUE; Ht`<XbQ>
if(pMsg -> wParam == VK_RETURN) 7.7Cluh5,
return TRUE; ['51FulDR
} $?]@_=
return CDialog::PreTranslateMessage(pMsg); F9m 2C'U
} Ur_S
[I
ql!5m\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p/ziFpU
{ Ek"YM[
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \S=XIf
SaveBmp(); |uQn|"U4
return FALSE; >Jm-2W5J
} \&eY)^vw
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =gMaaGg p,
CMenu pop; ' +)6#/*
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `7u\
CMenu*pMenu=pop.GetSubMenu(0); DHh+%|e
pMenu->SetDefaultItem(ID_EXITICON); SBCL1aM
CPoint pt; _/8_,9H
GetCursorPos(&pt); |Q5H9<*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k9*J*7l-m
if(id==ID_EXITICON) ax-=n (
DeleteIcon(); 4'+d"Ok
else if(id==ID_EXIT) T4V[RN
OnCancel(); 96.IuwL*.s
return FALSE; SjZd0H0
} C$]5l;`
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ucQezmie
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G*)s%2c>h
AddIcon(); zrLhQ3V#>
return res; YYTO,4
} &GXtdO>;Zv
XoDJzrL#
void CCaptureDlg::AddIcon() L/qZ ; {
{ tpv?`(DDU
NOTIFYICONDATA data; oS[W*\7'!
data.cbSize=sizeof(NOTIFYICONDATA); [TRGIGtq
CString tip; Bv;I0i:_
tip.LoadString(IDS_ICONTIP); |x1$b7
data.hIcon=GetIcon(0); Y;fuh[#
data.hWnd=GetSafeHwnd(); Am2*-
strcpy(data.szTip,tip); '4af
],
data.uCallbackMessage=IDM_SHELL; )v${&H
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &tlR~?$e*
data.uID=98; ,DE(5iDS
Shell_NotifyIcon(NIM_ADD,&data); 'b LP~
ShowWindow(SW_HIDE); Eem 2qKj
bTray=TRUE; Ix( 6
} i
FC"!23f
Zr\2BOcc.l
void CCaptureDlg::DeleteIcon() >=4sPF)
{ am]3
"V>
NOTIFYICONDATA data; V[#6yMU @
data.cbSize=sizeof(NOTIFYICONDATA); II.<S C
data.hWnd=GetSafeHwnd(); kFS0i%Sr
data.uID=98; j FgZ}Xp
Shell_NotifyIcon(NIM_DELETE,&data); cNdu.c[@
ShowWindow(SW_SHOW); }=Hf?';m
SetForegroundWindow(); IetCMp
ShowWindow(SW_SHOWNORMAL); z
VnIr<!8_
bTray=FALSE; ceqFQ
} E2>im>p
XZF%0g2$b
void CCaptureDlg::OnChange() ILNE 4n
{ }j&O/Up
RegisterHotkey(); =fY lzZh
} n(Qj||:
S{o@QVbl
BOOL CCaptureDlg::RegisterHotkey() .?A'6
{ ^/G?QR
UpdateData(); lTn;3'
UCHAR mask=0; 5fU!'ajaN7
UCHAR key=0; )URwIe{
if(m_bControl) g+:$X- r
mask|=4; #N; $
if(m_bAlt) ;_x2Ymw
mask|=2; C#Y,r)l
if(m_bShift) 4DvdEt
mask|=1; .8-PB*vb
key=Key_Table[m_Key.GetCurSel()]; G?>qd}]y0L
if(bRegistered){ |d5ggf.w
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q%rVo4M#2
bRegistered=FALSE; #1MKEfv(~
} C,[L/!
cMask=mask; P~&O4['<
cKey=key; TLy;4R2Nn
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &q.)2o#Q.
return bRegistered; O ,l\e3;
} &u&2D$K,tp
^GN5vT+:'
四、小结 `hzd|GmX
2K
Pqu:lv
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。