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:
OBSJbDqT
:uDB3jN[ 一、实现方法
,ToEKId {*$J&{6V 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:
HKw:fGt/o^ F|Ihq^q #pragma data_seg("shareddata")
HZ=yfJs nc HHOOK hHook =NULL; //钩子句柄
g|_*(=Q UINT nHookCount =0; //挂接的程序数目
?R:Hj=. static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ve^MqW&S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
EC#10. static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Jz0S2& static int KeyCount =0;
tp2 _OQAQ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
o9\m?~g!E #pragma data_seg()
P`"DepeD .WE0T|qDX 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。
HbDB?s< 2wsZ&y% 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:
(UXB#I~ (Fd4Gw<sq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
OR8o%AxL7 cKey,UCHAR cMask)
tb\pjLB][ {
8!>pFVNJf BOOL bAdded=FALSE;
6D(m8 for(int index=0;index<MAX_KEY;index++){
,sl.:C 4 if(hCallWnd[index]==0){
6
74X)hB hCallWnd[index]=hWnd;
Qf]!K6eR HotKey[index]=cKey;
FQ)Ekss~C HotKeyMask[index]=cMask;
".<p R}
qp bAdded=TRUE;
e'&{KD,-T KeyCount++;
rP4@K%F9jB break;
9ksrr{tW }
lM,:c.R }
x&Rp
m<4 return bAdded;
N&.p\T&t }
TaT&x_v^~a //删除热键
nCB3d[/B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*?fBmq[j {
1<|I[EI BOOL bRemoved=FALSE;
P[i/o# for(int index=0;index<MAX_KEY;index++){
ix`x dVj` if(hCallWnd[index]==hWnd){
^dD?riFAk if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fZgU@!z hCallWnd[index]=NULL;
\RO Sd HotKey[index]=0;
>WX'oP(< HotKeyMask[index]=0;
mIodD)?{ bRemoved=TRUE;
~vFo 0k( KeyCount--;
a$8?0`( break;
b] V=wZ
o }
_*I6O$/> }
1Tr=*b %f }
%b6wo?%* return bRemoved;
\_bX2Lg }
32D/%dHC /p"R}&z RA/yvr DLL中的钩子函数如下:
4*X$Jle| .X1niguXH LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
V485Yn!$( {
MsQS{ok+ BOOL bProcessed=FALSE;
LJ3UB if(HC_ACTION==nCode)
DI[Ee? {
p<34}iZ if((lParam&0xc0000000)==0xc0000000){// 有键松开
Z9I./s9 switch(wParam)
q'tT)IgD {
iX p8u** case VK_MENU:
]S ,GHPEN MaskBits&=~ALTBIT;
-NeF6 break;
E !M+37/ case VK_CONTROL:
m=V2xoMw6 MaskBits&=~CTRLBIT;
[y>.)BU break;
Cj9Tj'0@I+ case VK_SHIFT:
&KWh5S@w MaskBits&=~SHIFTBIT;
th,qq break;
^5}3FvW default: //judge the key and send message
=`H(`2 break;
jN0v<_PJED }
w2L)f,X for(int index=0;index<MAX_KEY;index++){
$h9!"f[|j if(hCallWnd[index]==NULL)
N0PX<$y continue;
YeJdkt
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p4 PFoFo2 {
dD%m=x SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6}$cDk`dz bProcessed=TRUE;
' M!_k+e }
Xy+|D#b }
B#yyO>0k] }
{r)M@@[ else if((lParam&0xc000ffff)==1){ //有键按下
,P +&-}gn9 switch(wParam)
m>_'f{&u {
i^l;PvIF case VK_MENU:
Nfh(2gK+ MaskBits|=ALTBIT;
iy9]Y5b break;
+qec>ALAg case VK_CONTROL:
NYeg,{q MaskBits|=CTRLBIT;
,<7f5qg"' break;
3Y8
V?* 1| case VK_SHIFT:
Z#04 ] MaskBits|=SHIFTBIT;
Tw5BvB1 break;
}s[/b"%y default: //judge the key and send message
]\U'_G2] break;
\Wk$>?+#@ }
JV>OmUAk for(int index=0;index<MAX_KEY;index++){
Pt+_0OsR if(hCallWnd[index]==NULL)
kn.z8%^( continue;
M> < if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V*~5*OwB {
tG-MC&;= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
2RCnk&u bProcessed=TRUE;
Lsdu:+- }
plq\D.C }
14R))Dz" }
r[~$ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
.B*)A. for(int index=0;index<MAX_KEY;index++){
zl5S)/A if(hCallWnd[index]==NULL)
3^Y-P8.zdB continue;
"oQ@.]-# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZSNg^)cN SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Z"jo
xZ //lParam的意义可看MSDN中WM_KEYDOWN部分
N.?Wev{ }
~nQb;Bdh% }
ra1hdf0" }
p=zm_+= return CallNextHookEx( hHook, nCode, wParam, lParam );
m78PQx
H }
sMx\WTyz C0M{zGT>} 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:
YS*t7 oS4ag BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
va0
a4s1O BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]+8,@%=" @h]H_ 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:
w'!gLta [g? NU] LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
z,tax`O {
_!CH if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
RjT[y: ! {
jv ";?*I6. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
`xSXGI SaveBmp();
0/Csc\Xl return FALSE;
cQny)2k*x }
/[OMpP …… //其它处理及默认处理
OX"`VE }
R+\5hI@ >i };*5+XY^
]%." 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。
&Lw| t_y [o~w>,a 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。
,<BTv;4p ?6Gq & 二、编程步骤
5>HI/QG PJLA^e C7> 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";
"7g: u- qv:WC
TAn 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
F2&KTK G>Q{[m$ 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;
<
5ow81 .XmD[= 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;
:X^B1z3X4 tua+R_" 5、 添加代码,编译运行程序。
L4!$bB~L- 7;XdTx 三、程序代码
_ AFgx8 7Q`4*H6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
wcO+P7g #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,Y*f] #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
&^EkM #if _MSC_VER > 1000
X7G6y|4;w #pragma once
,O2F}5|; #endif // _MSC_VER > 1000
;23F8M%wH #ifndef __AFXWIN_H__
/mb| %U]~ #error include 'stdafx.h' before including this file for PCH
*M="k 1P1 #endif
g%Z;rDfi #include "resource.h" // main symbols
<ANKoPNie class CHookApp : public CWinApp
#&2mu {
DeUDZL%/ public:
((y+FJH CHookApp();
A1|:$tED+2 // Overrides
'g#))y // ClassWizard generated virtual function overrides
'D1@+FFU0 //{{AFX_VIRTUAL(CHookApp)
X#J[Nn> public:
eRGip2^cq+ virtual BOOL InitInstance();
cX*^PSM virtual int ExitInstance();
u^ T2 //}}AFX_VIRTUAL
T:si?7CR //{{AFX_MSG(CHookApp)
0<Y)yNsV // NOTE - the ClassWizard will add and remove member functions here.
+,smjg:O // DO NOT EDIT what you see in these blocks of generated code !
' o5,P/6 //}}AFX_MSG
n8?gZ` W DECLARE_MESSAGE_MAP()
|peZ`O^~ };
3Ry?{m^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
lY~xoHT;[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,Zdc BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
t~Uqsa>n@' BOOL InitHotkey();
+h
=lAHn& BOOL UnInit();
{DpZg",H- #endif
i_MDLS>- p\(%bO //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
QKVZ![Y!s #include "stdafx.h"
M4QMD;Ez #include "hook.h"
W4N$]D= #include <windowsx.h>
htaB!Q?V #ifdef _DEBUG
k,r\^1h #define new DEBUG_NEW
MW p^. #undef THIS_FILE
M?_VYK static char THIS_FILE[] = __FILE__;
03MB, #endif
ZXco5,1 #define MAX_KEY 100
k -SUp8}g #define CTRLBIT 0x04
Dr;@) #define ALTBIT 0x02
w}'E]y2. #define SHIFTBIT 0x01
xQN](OKG #pragma data_seg("shareddata")
|h.he_B+7 HHOOK hHook =NULL;
XpM#0hm UINT nHookCount =0;
`+<5QtD static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
pdE=9l' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
kJ~^
}o static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
MOj 0"x) static int KeyCount =0;
Gm*i='f!? static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
sI~{it# #pragma data_seg()
HMBxj($eR HINSTANCE hins;
r+) A)a, void VerifyWindow();
13B[mp4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
iKDGYM //{{AFX_MSG_MAP(CHookApp)
Q
i? // NOTE - the ClassWizard will add and remove mapping macros here.
7Npz
{C{I // DO NOT EDIT what you see in these blocks of generated code!
39u!j|VH //}}AFX_MSG_MAP
u tQ_!3u END_MESSAGE_MAP()
50CU| N?~K9jGx( CHookApp::CHookApp()
?4xTA
{
NxNz(R
$~ // TODO: add construction code here,
N 4Dyec\ // Place all significant initialization in InitInstance
u%&zY97/ }
[u~#F,_ow 6N]v9uXZ CHookApp theApp;
^oA^z1>3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
pO"V9[p] {
wKwireOs BOOL bProcessed=FALSE;
'*22j ] if(HC_ACTION==nCode)
C7PHZ`< {
Ua(!:5q? if((lParam&0xc0000000)==0xc0000000){// Key up
}4+S_b switch(wParam)
1MOQ/N2BR {
C,K P!B{ case VK_MENU:
Zr`:A$ MaskBits&=~ALTBIT;
u+S*D\p<` break;
W[+E5I case VK_CONTROL:
oZ!rK/qoA MaskBits&=~CTRLBIT;
37{mhU break;
\p.ku%{ case VK_SHIFT:
0e3aWn MaskBits&=~SHIFTBIT;
C#(4>' break;
V"
I+E default: //judge the key and send message
W<kJ%42^j break;
Al
0zL }
3pm;?6i6 for(int index=0;index<MAX_KEY;index++){
" >;},$ if(hCallWnd[index]==NULL)
#Jg)HU9
continue;
A`IE8@&Z' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!30BZM^ {
K47W7zR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(]rtBeT bProcessed=TRUE;
%<K`d }
c^I_~OwaE }
7Ij FSN> }
EpS"NQEe else if((lParam&0xc000ffff)==1){ //Key down
YwEXTy>0 switch(wParam)
)x#^fN~ 7` {
Zs)HzOP)9 case VK_MENU:
kyz_r6 MaskBits|=ALTBIT;
5^[V%4y> break;
d&t|Y:,8 case VK_CONTROL:
AOhsat;O` MaskBits|=CTRLBIT;
p.&FK'&[0 break;
_v<EFal case VK_SHIFT:
+K]kGF MaskBits|=SHIFTBIT;
{R]4N]l> break;
4R@3jGXb8q default: //judge the key and send message
`2Vc*R break;
D@&0 P& }
H<g-
Bhv for(int index=0;index<MAX_KEY;index++)
Ql!$e&A|l {
K@`F*^A}V if(hCallWnd[index]==NULL)
|5`z;u7V continue;
b?qtTce if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\,lgv {
%6HDLG6@^} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,H\EPmNHK bProcessed=TRUE;
?<
mSEgvu }
!bS:!Il9= }
\Ua"gS2L }
4 mPCAA7 if(!bProcessed){
^HQg$}= for(int index=0;index<MAX_KEY;index++){
}5FdX3YR if(hCallWnd[index]==NULL)
\A
Y7%> continue;
C4]vq+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
h)fi9 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
z^O>'9# }
jv?`9{- }
0k0y'1SL }
G)M9to return CallNextHookEx( hHook, nCode, wParam, lParam );
Jah~h44& }
*h$Z:p-g aB+Ux<
- BOOL InitHotkey()
-(ABQgSO] {
Gr}Lp if(hHook!=NULL){
s=#3f3 nHookCount++;
(sz=IB ; return TRUE;
F2:?lmhL< }
sJ{NbN~`I else
C1Slx!} hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
:"|}oKT%mP if(hHook!=NULL)
ci <`*>l nHookCount++;
=4 36/O`K return (hHook!=NULL);
sTU`@}} }
Z>{3t/` BOOL UnInit()
7ae8nZ3& {
t[XxLG* if(nHookCount>1){
;gu_/[P nHookCount--;
U8PSJ0ny return TRUE;
EQET:a:g }
$RfM}!7? BOOL unhooked = UnhookWindowsHookEx(hHook);
XL1v&'HLV if(unhooked==TRUE){
E?m(&O
j nHookCount=0;
~8o's` hHook=NULL;
{Ug?k<h7| }
_jQ"_Ff return unhooked;
4jfkCU }
6V
KsX+sd }1f@>'o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_ko16wfg {
+'Ec)7m BOOL bAdded=FALSE;
}E+#*R3auB for(int index=0;index<MAX_KEY;index++){
K1AI:$H if(hCallWnd[index]==0){
G>qzAgA hCallWnd[index]=hWnd;
al.~[T-O+ HotKey[index]=cKey;
2j+v\pjYC HotKeyMask[index]=cMask;
}Zu>?U bAdded=TRUE;
xv4_q-r[ KeyCount++;
lU`]yL break;
K!VIY|U }
_=Ed>2M)no }
NjIe2)}' return bAdded;
Z_.Eale^ }
gBA
UrY%] 6hv4D`d;o BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
W2e~!:w {
SQ9s BOOL bRemoved=FALSE;
t9685s for(int index=0;index<MAX_KEY;index++){
tIR"y:U+ if(hCallWnd[index]==hWnd){
5*l~7R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
wu"6Kyu hCallWnd[index]=NULL;
wws)**]J8 HotKey[index]=0;
l*T>9yC HotKeyMask[index]=0;
;I1}g] bRemoved=TRUE;
]([:"j KeyCount--;
4mq+{c0 break;
2"*7HS }
K+5S7wFDZ }
po~V{>fUm }
;cgc\xm> return bRemoved;
@0S3`[/U }
uDJi2,|n ~3<Li}W void VerifyWindow()
{p&LwTnf {
^AS*X2y for(int i=0;i<MAX_KEY;i++){
X YO09#>& if(hCallWnd
!=NULL){ 'yu M=Pb
if(!IsWindow(hCallWnd)){ :_E
q(r
hCallWnd=NULL; x2(!r3a
HotKey=0; .>NhC"
HotKeyMask=0; Yj99[
c#]
KeyCount--; z;yb;),
} m{4e+&S|
} AQ:cim`
} :SjTkfU
} ;$gZ?&
0vbiq
BOOL CHookApp::InitInstance() u;rK.3o
{ uKHkC.g
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y>LgpO.
hins=AfxGetInstanceHandle(); E~Eh'>Y(B
InitHotkey(); + Bk"
khH
return CWinApp::InitInstance(); |d\rCq >
} l ps
6lnh
{Hxvt~P
int CHookApp::ExitInstance() O&YX V
{ HQlhT
VerifyWindow(); W|XTa
UnInit(); E#?*6/
return CWinApp::ExitInstance(); S(<r-bV<
} 8@S7_x
F[uy'~;@
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |y=; #A
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HO%atE$>
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pcwkO
#if _MSC_VER > 1000 <+ 0cQq=2
#pragma once SEsc"l8
#endif // _MSC_VER > 1000 ckFnQhW
EooQLZ
class CCaptureDlg : public CDialog wmbjL=f
Ia
{ yDh(4w-~gk
// Construction e]R`B}vO
public: \-3\lZ3qj
BOOL bTray; |d}f\a`
BOOL bRegistered; dXR70/
BOOL RegisterHotkey(); -{H;w=9
UCHAR cKey; }? j>V
UCHAR cMask; )f(.{M
void DeleteIcon(); wG6@.;3
void AddIcon(); 3";Rw9
UINT nCount; $@k[Xh
void SaveBmp(); 8;2UP`8s ?
CCaptureDlg(CWnd* pParent = NULL); // standard constructor am;)@<8~Q
// Dialog Data %%J)@k^vH
//{{AFX_DATA(CCaptureDlg) Z'sAu#C
enum { IDD = IDD_CAPTURE_DIALOG }; pGEYke NU
CComboBox m_Key; 8l,`~jvU!*
BOOL m_bControl; h#a;(F4_7
BOOL m_bAlt; pUtd_8
BOOL m_bShift; *PQu9>1w
CString m_Path; v,z s
dr"d
CString m_Number; %Ci`OhT
//}}AFX_DATA PAG.],"D
// ClassWizard generated virtual function overrides 0?kaXD
//{{AFX_VIRTUAL(CCaptureDlg) wcz|Zy
public: pm$ZKM
virtual BOOL PreTranslateMessage(MSG* pMsg); |tL57Wu93
protected: tj:3R$a
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ANB@cK_
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \\;i
//}}AFX_VIRTUAL z~tCag8I(k
// Implementation rUZRYF4C
protected: ie4keVlXc
HICON m_hIcon; 9$[I~I#z
// Generated message map functions qFEGV+
//{{AFX_MSG(CCaptureDlg) ~P&Brn"=Rs
virtual BOOL OnInitDialog(); c 32IO&W4
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =2&/Cn4
afx_msg void OnPaint(); VxD_:USIF
afx_msg HCURSOR OnQueryDragIcon(); n#@/A
virtual void OnCancel(); VA4>!t)
afx_msg void OnAbout(); -"J6|Y#8
afx_msg void OnBrowse(); ="E^9!
afx_msg void OnChange(); 3I!xa*u
//}}AFX_MSG mEi+Tj zp
DECLARE_MESSAGE_MAP() s|iph~W!L
}; C9l5zb~D
#endif (eX9O4
huh-S ,M
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1,cd[^`.
#include "stdafx.h" Gok8:,
#include "Capture.h" QoZ7l]^
#include "CaptureDlg.h" -dX{ R_*
#include <windowsx.h> |Z%I3-z_DS
#pragma comment(lib,"hook.lib") h{zE;!+)D
#ifdef _DEBUG [NQ\(VQ1c
#define new DEBUG_NEW jDI )iW`P
#undef THIS_FILE 8#% Sq=/+M
static char THIS_FILE[] = __FILE__; Nxk3uF^
#endif 4o,%}bo&
#define IDM_SHELL WM_USER+1 |$[WnYP
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q`$Q(/
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LW?Zd=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; LxqK@Q<B
class CAboutDlg : public CDialog ,(aOTFQS
{ !'uLV#YEZ
public: >r Nff!Ow
CAboutDlg(); Y|ONCc
// Dialog Data diXb8L7B;
//{{AFX_DATA(CAboutDlg) Wtl0qug
enum { IDD = IDD_ABOUTBOX }; mNcoR^(VN
//}}AFX_DATA cSdkhRAn
// ClassWizard generated virtual function overrides om 3$=
//{{AFX_VIRTUAL(CAboutDlg) -rE_ pV;
protected: }sTo,F$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u<8 f;C_
//}}AFX_VIRTUAL {"<6'2T3
// Implementation ml7nt0{
protected: NOOP_:( 7H
//{{AFX_MSG(CAboutDlg) :,.g_@wvG
//}}AFX_MSG M6n9>aW4
DECLARE_MESSAGE_MAP() KP)BD;
}; iUuG}rqj
-$pS
{q;
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xEK+NKTeV
{
&tb
//{{AFX_DATA_INIT(CAboutDlg) tCnx:1
//}}AFX_DATA_INIT 99Xbp P55
} a
}6Fj&hj
KM$5ZbCF:
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?VM# Nf\
{ Dd+ f,$
CDialog::DoDataExchange(pDX); %(4G[R[
//{{AFX_DATA_MAP(CAboutDlg) + -e8MvP
//}}AFX_DATA_MAP }gw
`,i
} 8J|pj4ce
CbK&.a
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _=0;5OrK1X
//{{AFX_MSG_MAP(CAboutDlg) GH%'YY3|
// No message handlers (W~jr-O^
//}}AFX_MSG_MAP $YDZtS&h
END_MESSAGE_MAP() X1* 6qd+E
by*>w/@9)k
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) JyPsRpi\
: CDialog(CCaptureDlg::IDD, pParent) 2N]u!S ;d
{ W":is"
//{{AFX_DATA_INIT(CCaptureDlg) muLt/.EZ
m_bControl = FALSE; i4TU}.h8
m_bAlt = FALSE; \'(
@{
m_bShift = FALSE; A`4Di8'Me
m_Path = _T("c:\\"); KMz\h2X
m_Number = _T("0 picture captured."); \=+s3p5N
nCount=0; \ iL&Aq}BO
bRegistered=FALSE; Qy ;
M:q
bTray=FALSE; ?DVO\Cp
//}}AFX_DATA_INIT f_1#>]
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L2ePWctq}
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !Ju?REH
} QZufQRfr{
fgFBOpG%Gq
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '"}|'J
{ < 4DWH
CDialog::DoDataExchange(pDX); Zl]Zy}p* +
//{{AFX_DATA_MAP(CCaptureDlg) w>I>9O}(`
DDX_Control(pDX, IDC_KEY, m_Key); 7^k`:Z
DDX_Check(pDX, IDC_CONTROL, m_bControl); +Ux)m4}j
DDX_Check(pDX, IDC_ALT, m_bAlt); NLDmZra
DDX_Check(pDX, IDC_SHIFT, m_bShift); =J.)xDx*
DDX_Text(pDX, IDC_PATH, m_Path); hq9b
DDX_Text(pDX, IDC_NUMBER, m_Number); yhr\eiJ@6
//}}AFX_DATA_MAP 7 q<UJIf
} )>LQ{X.
t1HUp dHY
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) GE$spx
//{{AFX_MSG_MAP(CCaptureDlg) R7us9qM4e
ON_WM_SYSCOMMAND() v _Bu
ON_WM_PAINT() i|>K
ON_WM_QUERYDRAGICON() 8F0+\40
ON_BN_CLICKED(ID_ABOUT, OnAbout) ,hK0F3?H>
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lo:]r.lX{
ON_BN_CLICKED(ID_CHANGE, OnChange) Du>dTi~
//}}AFX_MSG_MAP VVuL+i
END_MESSAGE_MAP() #bPio
p$}iBk0B(z
BOOL CCaptureDlg::OnInitDialog() gf+Kr02~
{ 5EIhCbA
CDialog::OnInitDialog(); ErF;5ec
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LGT\1u
ASSERT(IDM_ABOUTBOX < 0xF000); e ,zR
CMenu* pSysMenu = GetSystemMenu(FALSE); /vPh_1
if (pSysMenu != NULL) rtDm<aUh
{ p}.P^`~j
CString strAboutMenu; IS7g{:}=p
strAboutMenu.LoadString(IDS_ABOUTBOX); DLE|ctzj[7
if (!strAboutMenu.IsEmpty()) 9\*xK%T+
{ CogLo&.
pSysMenu->AppendMenu(MF_SEPARATOR); =mCUuY#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); j' -akXo<
} c=H(*#
} VL"ZC:n)-
SetIcon(m_hIcon, TRUE); // Set big icon sS OI5W3A
SetIcon(m_hIcon, FALSE); // Set small icon +-,Q>`
m_Key.SetCurSel(0); IoNZ'g?d
RegisterHotkey(); 7dX1.}M<(
CMenu* pMenu=GetSystemMenu(FALSE); %iIryv;
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _jef{j
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yhEU*\:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V_U$JKJ1=
return TRUE; // return TRUE unless you set the focus to a control ld94ek
} 7"=
,oDZ:";
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g'Ft5fQ"o/
{ j._9;HifZ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ltt%X].[
{ >82Q!HaH
CAboutDlg dlgAbout; E?&dZR
dlgAbout.DoModal(); 'q1)W'
} ?7G?uk]3,@
else xXZ$#z\Z,
{ {Cs~5jYz
CDialog::OnSysCommand(nID, lParam); G5zZf~r
} 'jcDfv(v<
} iAf, :g
qsFA~{o.
void CCaptureDlg::OnPaint() oypq3V=5
{ N!;Y;<Ro_
if (IsIconic()) E?z 3&C
{ HeGGAjc
CPaintDC dc(this); // device context for painting iUA2/ A
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >;o^qi_$
// Center icon in client rectangle *P:`{ZV7=W
int cxIcon = GetSystemMetrics(SM_CXICON); [x!T<jJ
int cyIcon = GetSystemMetrics(SM_CYICON); UuT>qWxQ8
CRect rect;
.EH^1.|v
GetClientRect(&rect); {^9,Dy_D
int x = (rect.Width() - cxIcon + 1) / 2; PK3)M'[
int y = (rect.Height() - cyIcon + 1) / 2; gq[}/E0e
// Draw the icon Rjo6Pd{d<
dc.DrawIcon(x, y, m_hIcon); Du$kDCU
} \ ;Hj,z\
else :<ujk
{ \UJ:PW$7
CDialog::OnPaint(); o&*1Mx<+
} N&S:=x:$S
} abD55YJY
;eG%#=>
HCURSOR CCaptureDlg::OnQueryDragIcon() bm%2K@ /U
{ 8[f]9P/i
return (HCURSOR) m_hIcon;
ceVej'
} ;^}cZ
lZ^XZjwoM
void CCaptureDlg::OnCancel() \I#lLP
{ UN|"D]>/
if(bTray) ]ZO^@sH
DeleteIcon(); !i_5XcH
CDialog::OnCancel(); lhQ*;dMj%"
} * _C6.%{
~u%9@}Oo>
void CCaptureDlg::OnAbout() $q.8ve0&^
{ $+JaEF`8
CAboutDlg dlg; ,a$LT
dlg.DoModal(); ICq;jf ML
}
+aP%H
"5XD+qi
void CCaptureDlg::OnBrowse() ,n &|+&
{ 4x8mJ4[H^
CString str; e[915Q _
BROWSEINFO bi; JEY%(UR8
char name[MAX_PATH]; sF_.9G)S0
ZeroMemory(&bi,sizeof(BROWSEINFO)); "TtK!>!.
bi.hwndOwner=GetSafeHwnd(); J;m[1Mae&
bi.pszDisplayName=name; }kL%l
bi.lpszTitle="Select folder"; q7 Uu 8JXF
bi.ulFlags=BIF_RETURNONLYFSDIRS; }}t"^m s
LPITEMIDLIST idl=SHBrowseForFolder(&bi); BT d$n!'$n
if(idl==NULL) j(nPWEyJM
return; ]}>GUXe)^
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3p!R4f)GN
str.ReleaseBuffer(); _3A$zA
m_Path=str; $C#~c1w
if(str.GetAt(str.GetLength()-1)!='\\') MrOW&7
m_Path+="\\"; .vQ2w
UpdateData(FALSE); Yz-b~D/=}
} J9poqp@`MG
HaB=nLAT
void CCaptureDlg::SaveBmp() (O&~*7D*
{ XFK$p^qu
CDC dc; \iowAo$
dc.CreateDC("DISPLAY",NULL,NULL,NULL); IA8kq =W
CBitmap bm; )4GfT
int Width=GetSystemMetrics(SM_CXSCREEN); n6Q 3X
int Height=GetSystemMetrics(SM_CYSCREEN); )}G
HG#D{
bm.CreateCompatibleBitmap(&dc,Width,Height); !3yR?Xem}
CDC tdc; &e,xN;
tdc.CreateCompatibleDC(&dc); qf24l&}
CBitmap*pOld=tdc.SelectObject(&bm); WHE*NWz>q
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); j nI)n*
tdc.SelectObject(pOld); C6'[ Tn
BITMAP btm; #"i}wS
bm.GetBitmap(&btm); pk;bx2CP8
DWORD size=btm.bmWidthBytes*btm.bmHeight; 0"
R|lTYq
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ynP^|Ou
BITMAPINFOHEADER bih; 9Eg'=YJ
bih.biBitCount=btm.bmBitsPixel; Wt8;S$!=R
bih.biClrImportant=0; LfgR[!
bih.biClrUsed=0; "]MF =-v
bih.biCompression=0; ;=h^"et
bih.biHeight=btm.bmHeight; HLk}E*.mC
bih.biPlanes=1; Ih,~h[
bih.biSize=sizeof(BITMAPINFOHEADER); kP8Ypw&
bih.biSizeImage=size; /#>?wy<s~
bih.biWidth=btm.bmWidth; hC6$>tl
bih.biXPelsPerMeter=0; )%,bog(x
bih.biYPelsPerMeter=0; x(mY$l,il
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); krz@1[w-j
static int filecount=0; d8]6<\g
CString name; 6"_FjS3Sl
name.Format("pict%04d.bmp",filecount++); o`RTvGXk
name=m_Path+name; l[\[)X3$
BITMAPFILEHEADER bfh; ;Kkn7&'F
bfh.bfReserved1=bfh.bfReserved2=0; :4Q_\'P
bfh.bfType=((WORD)('M'<< 8)|'B'); BIcE3}dS8
bfh.bfSize=54+size; 83TN6gW
bfh.bfOffBits=54; qQpR gzw
CFile bf; $)7-wCl</
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p(0!TCBs
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2d$hgR#v
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
ZfvFs
bf.WriteHuge(lpData,size); ,T&B.'cq
bf.Close(); GueqpEd2
nCount++; I"@5=m5
} fWKv3S1dT
GlobalFreePtr(lpData); [eWB
vAiW
if(nCount==1) Y/@4|9!
m_Number.Format("%d picture captured.",nCount); _v2FXm
else K bwWrf>
m_Number.Format("%d pictures captured.",nCount); [ HNGTde&
UpdateData(FALSE); 2^UFP+Yw
} ]^Q`CiKd
x5PQ9Bw,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "F%cn@l
{ aNXu"US+Sp
if(pMsg -> message == WM_KEYDOWN) %X[|7D-
{ _Dk;U*2
if(pMsg -> wParam == VK_ESCAPE) zD) 2af
return TRUE; vNJ!i\bX
if(pMsg -> wParam == VK_RETURN) hsfVKlw-
return TRUE; 1RcaE!\p
} ?"sk"{
return CDialog::PreTranslateMessage(pMsg); u[d8)+VX
} ]MB^0:F-
pazFVzT
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y!aq}YS
{ ]Ff&zBJ
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ r ."Dc
SaveBmp(); ~@sx}u
return FALSE;
ze#LX4b I
} l|N1u=Z
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oPWvZI(\&
CMenu pop; .[O*bk
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); T+2?u.{I
CMenu*pMenu=pop.GetSubMenu(0); 7 v`Y*D
pMenu->SetDefaultItem(ID_EXITICON); 9*,5R,#
CPoint pt; ld2\/9+n
GetCursorPos(&pt); 2I>C A[qp
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Bxm^Arc>
if(id==ID_EXITICON) elP`5BuN
DeleteIcon(); y4shW|>5_
else if(id==ID_EXIT) %A W
OnCancel(); #j; &g1
return FALSE; |0-5-.
} O[`n{Vl/
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "t\rjFw
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6dg[
AddIcon(); NrL%]dl3/
return res; a(BC(^1!
} S)Ld^0w
# <&=ZLN
void CCaptureDlg::AddIcon() //6m2a
{ y4envjl0
NOTIFYICONDATA data; r}vI#;&
data.cbSize=sizeof(NOTIFYICONDATA); .g4bV5ma3
CString tip; f#^%\K:YYR
tip.LoadString(IDS_ICONTIP); M{z+=c&w
data.hIcon=GetIcon(0); *M KVm)Iv
data.hWnd=GetSafeHwnd(); y< 146
strcpy(data.szTip,tip); Vw)\#6FL
data.uCallbackMessage=IDM_SHELL; nGyY`wt&Rg
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 44_n5vp,T
data.uID=98; %A64 Y<K
Shell_NotifyIcon(NIM_ADD,&data); e#W@ep|n
ShowWindow(SW_HIDE); ikm4Y`c
bTray=TRUE; ]`:Fj|>
} O`Z>Oon?
dd$\Q
void CCaptureDlg::DeleteIcon() [ ra[~
{ :l*wf/&z
NOTIFYICONDATA data; 9 -TFyZYU
data.cbSize=sizeof(NOTIFYICONDATA); J.O;c5wL
data.hWnd=GetSafeHwnd(); 7dU X(D,?
data.uID=98; Hj2P|;2S
Shell_NotifyIcon(NIM_DELETE,&data); y0=BL
ShowWindow(SW_SHOW); a2YdkdjT
SetForegroundWindow(); >GZF\ER
ShowWindow(SW_SHOWNORMAL); ?mF-zA'4]
bTray=FALSE; 2Jj`7VH>
} N*o+m~:y
&O!d!Pf
void CCaptureDlg::OnChange() c"0CHrd
{ sY1*WolA
RegisterHotkey(); =#>P!
} wBmbn=>#S
ExnszFX*
BOOL CCaptureDlg::RegisterHotkey() 1lx\Pz@ol
{ _
k>j?j-
UpdateData(); /?by4v73P
UCHAR mask=0; A
7TP1
UCHAR key=0; 3HfT9
if(m_bControl) -98bX]8
mask|=4; Y3-15:-
if(m_bAlt) wV(_=LF
mask|=2; 6o6m"6
if(m_bShift) Ob(j_{m
mask|=1; -8TJ~t%w4
key=Key_Table[m_Key.GetCurSel()]; D{G#|&;
if(bRegistered){ &os*@0h4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]n!pn#Q
bRegistered=FALSE; `d8$OC
} tU?lfU[7
cMask=mask; ,,,5pCi\
cKey=key; }RM?gE
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A}oR,$D-
return bRegistered; cvc.-7IO
} 'MC)%N,
j[=f;&1
四、小结 q 2=^l
oR3$A :!P=
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。