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:
{xTh!ih2-
|KO[[4b ?+ 一、实现方法
U-U(_W5& _lRIS_^;eE 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:
0}|%pmY` P{Q$(rOe #pragma data_seg("shareddata")
_c-(T&u< HHOOK hHook =NULL; //钩子句柄
{Z
Ld_VGW UINT nHookCount =0; //挂接的程序数目
?sR( static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
h##U=`x3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}]<|`FNc static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
D 5:'2i static int KeyCount =0;
l-x- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0kw) -)= #pragma data_seg()
<AP.m4N) _ 563ExibH 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
&qIdT;^=I OI3j!L2f DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
a:4!z;2
| yf-2E_yB BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
.'h^ cKey,UCHAR cMask)
+rhBC
V {
)h{+pK BOOL bAdded=FALSE;
/x_AWnU for(int index=0;index<MAX_KEY;index++){
P8;1,?ou if(hCallWnd[index]==0){
^+k= ;nl hCallWnd[index]=hWnd;
d<WNN1f HotKey[index]=cKey;
TefPxvd HotKeyMask[index]=cMask;
oMOh4NH,x bAdded=TRUE;
3\C+g{}e KeyCount++;
e@/' o/ break;
CC3M7|eO3 }
!|- U, }
z+CX$.Z return bAdded;
.MID)PY- }
Q("4R //删除热键
/FC(d5I BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
hTcU
%Nc {
H$pgzNL BOOL bRemoved=FALSE;
]KG.-o30 for(int index=0;index<MAX_KEY;index++){
,WM-%2z^4I if(hCallWnd[index]==hWnd){
L{&=SR. if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_N>#/v)Yi hCallWnd[index]=NULL;
R|``A5zQ HotKey[index]=0;
Gvvw:]WgF HotKeyMask[index]=0;
-(ST bRemoved=TRUE;
{vZAOz7# KeyCount--;
+Yc@<$4 break;
FV,aQ# }
>ffC?5+ }
GCv1x-> }
s#")hMJQ return bRemoved;
aygK$.wos }
7u5H o` |Q";a:&$ /^bU8E&^M DLL中的钩子函数如下:
uY/CiTWr i->G{_gH LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
W
)Ps2 {
F2EX7Crj BOOL bProcessed=FALSE;
N|ZGc{? if(HC_ACTION==nCode)
qElPYN*wF {
mG0_&'"YIG if((lParam&0xc0000000)==0xc0000000){// 有键松开
h(4\k?C5 switch(wParam)
3SPXJa\i {
DZEq(>mn case VK_MENU:
up0=Y
o@ MaskBits&=~ALTBIT;
gFfKK`)}D' break;
`0!%jz= case VK_CONTROL:
5P 5Tgk MaskBits&=~CTRLBIT;
*&R|0I{> break;
sOS^ case VK_SHIFT:
jc#gn&4C MaskBits&=~SHIFTBIT;
eX!yIqAR break;
V{x[^+w7X~ default: //judge the key and send message
|B64%w>Y break;
.f>7a;V?} }
raU_Z[ for(int index=0;index<MAX_KEY;index++){
}1lZW"{e[ if(hCallWnd[index]==NULL)
Z5EII[=$o continue;
kf9]nIo if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GJHJ?^% {
t -fmA?\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}nO%q6|\V bProcessed=TRUE;
\|M[W~8 }
kX:1=+{xg }
tT]mMlKJ }
RUVrX`u*( else if((lParam&0xc000ffff)==1){ //有键按下
3v `@** switch(wParam)
N%e^2O) {
G-sQL'L[U case VK_MENU:
$'<$:;4b3 MaskBits|=ALTBIT;
R4$(NNC+/ break;
M
8(w+h{ case VK_CONTROL:
HYY+Fv5 MaskBits|=CTRLBIT;
"s(|pQh; break;
U^qS[HM case VK_SHIFT:
z92Xc MaskBits|=SHIFTBIT;
8|5+\1!#/) break;
0I2?fz) default: //judge the key and send message
s%6L94\t break;
;z+}|>! }
U!JmSP for(int index=0;index<MAX_KEY;index++){
%Q;:nVt if(hCallWnd[index]==NULL)
LW">9;n continue;
c+8 Y|GB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,6"[vb#*3 {
NJOV!\k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&4l!2 bProcessed=TRUE;
(|3?wX'2U }
^BW8zu@=O }
L6ypn)l }
K5??WB63B
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
K2V?[O# for(int index=0;index<MAX_KEY;index++){
U#XW}T=| if(hCallWnd[index]==NULL)
~SsfkM" continue;
AgUjC if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
P\z1fscnK SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
n,_9Eh#WD //lParam的意义可看MSDN中WM_KEYDOWN部分
[TxvZq*4 }
w6^TwjjZ$ }
/sPa$D }
Y ._Om}H return CallNextHookEx( hHook, nCode, wParam, lParam );
[=u@6Y }
x@pzgqi3 &?}h)U#: 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
[[]NnWJ vy>(?[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z(>:LX"xz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_p9 _P g8 :r{W)(mm 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
.v9i|E=<~ n^l5M^. LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
`q1-yH0~4 {
[d>2F if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
GW%!?mJ {
kb~ 9/)~g //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
l^$U~OB8k SaveBmp();
dKw[#(m5v return FALSE;
y\dx \ }
twa H20 …… //其它处理及默认处理
>km$zfM2- }
!L/.[:X f;&XTF5D^ z@jKzyq 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
ZOx;]D"s S>"C}F$X 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。
M[_Ptqjb @9k/od@mW 二、编程步骤
2{g&9 X6?Gxf, 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";
N2u4MI2 B\;fC's+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qa6HwlC1 A!$sOp 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Ku3NE-) Ct3+ga$ 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;
|UcF%VNnz1 4%<D\# 5、 添加代码,编译运行程序。
OSC_-[b- 0zA:?} 三、程序代码
C"k]U[%{ i2LN`5k ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
(YYwn@NGj #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
s:tWEgZk? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Xxm7s S #if _MSC_VER > 1000
a4q02 cV #pragma once
]Rmu+N| #endif // _MSC_VER > 1000
-^rdB6O6j #ifndef __AFXWIN_H__
D2\Ep L/ #error include 'stdafx.h' before including this file for PCH
`_J>R #endif
Z/;8eb*B7 #include "resource.h" // main symbols
MA7&fNjB class CHookApp : public CWinApp
Jf@Xz7{z {
w&&)v~Y_ public:
2k`Q+[?{q> CHookApp();
.e5rKkkT // Overrides
gLbTZM4i // ClassWizard generated virtual function overrides
[-#q'S //{{AFX_VIRTUAL(CHookApp)
H\|H]: CE public:
UXHtmi|_: virtual BOOL InitInstance();
X(C=O?A virtual int ExitInstance();
3tmS/tQp //}}AFX_VIRTUAL
/T 4GPi\lg //{{AFX_MSG(CHookApp)
U(<~("ocN // NOTE - the ClassWizard will add and remove member functions here.
~jC$C2A0 // DO NOT EDIT what you see in these blocks of generated code !
pJQ_G`E //}}AFX_MSG
+n|@'= ] DECLARE_MESSAGE_MAP()
R~#&xfMd. };
!1bATO:x LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
AxCFZf 5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Js9EsN% BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
S&'-wAEd BOOL InitHotkey();
-TyBb] BOOL UnInit();
o~VZ%B #endif
s 8lfW6
X@~R< //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
P0-K/_g #include "stdafx.h"
$ Vsf?ID #include "hook.h"
_P=L| U#C #include <windowsx.h>
s>ZlW:jY #ifdef _DEBUG
d s}E|Q #define new DEBUG_NEW
)79F"ltzh #undef THIS_FILE
|eej}G(,m} static char THIS_FILE[] = __FILE__;
!LpFK0rw #endif
'5P:;zw #define MAX_KEY 100
=K9- #define CTRLBIT 0x04
VQ4rEO=t #define ALTBIT 0x02
U{3Pk0rZ #define SHIFTBIT 0x01
F\+!\b*lP #pragma data_seg("shareddata")
I$I',x5Z HHOOK hHook =NULL;
9:*a9xT, UINT nHookCount =0;
s&6/fa
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
D(Q=EdlO static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
]Q{MF- EKj static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
zUJPINDb static int KeyCount =0;
y~rtYI
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
^:o^g'Yab #pragma data_seg()
,Z[pLF HINSTANCE hins;
=UZm4=T void VerifyWindow();
o@r~KFIe BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Cvtz&dH //{{AFX_MSG_MAP(CHookApp)
/#e-x|L // NOTE - the ClassWizard will add and remove mapping macros here.
N-Sjd%Z // DO NOT EDIT what you see in these blocks of generated code!
3}i(i0+ //}}AFX_MSG_MAP
ljk,R
G END_MESSAGE_MAP()
UphZRgT!N @}A3ie'w CHookApp::CHookApp()
3xpygx9 {
~@'DYZb-
H // TODO: add construction code here,
:n$?wp // Place all significant initialization in InitInstance
kC0^2./p }
UAtdRVi]M &=v5M9GR] CHookApp theApp;
r%` |kN LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
6Zq7O\ {
0|`iop%(n BOOL bProcessed=FALSE;
w)%/Me3o if(HC_ACTION==nCode)
VJ|80?4h {
!FbW3p f if((lParam&0xc0000000)==0xc0000000){// Key up
\.{ZgL5" switch(wParam)
)|L#i2?: {
X5o{d4R L case VK_MENU:
78FK{Cr MaskBits&=~ALTBIT;
<l^#FH break;
9lSs;zm{Q case VK_CONTROL:
}wV/)Oy[ MaskBits&=~CTRLBIT;
IFF3gh42. break;
RRR=R] case VK_SHIFT:
)W3kBDD MaskBits&=~SHIFTBIT;
oJVpJA0IA break;
,\0>d}eh! default: //judge the key and send message
-^= JKd&p break;
hg}R(.1K= }
txemu* for(int index=0;index<MAX_KEY;index++){
^TCfj^FP if(hCallWnd[index]==NULL)
8jfEvwY continue;
NLO&.Q]# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@ R;o $n {
1Et{lrgh
f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
@d6N[?3; bProcessed=TRUE;
>&uR=Yd }
1_G5uHO }
<5sP%Fs ) }
>Mk#19j[/ else if((lParam&0xc000ffff)==1){ //Key down
ny[\yj4F switch(wParam)
{DbWk>[DkG {
lhduK4u case VK_MENU:
6B`,^8Lp MaskBits|=ALTBIT;
_&/2-3]\B break;
UViWejA/*u case VK_CONTROL:
t{Gc,S!]5 MaskBits|=CTRLBIT;
(c1Kg break;
mA0|W#NB case VK_SHIFT:
a3[lZPQe MaskBits|=SHIFTBIT;
]`_eaW?Ua break;
o9AwW default: //judge the key and send message
EMMp4KKOx+ break;
?4MZT5 . }
yVb yw(gS for(int index=0;index<MAX_KEY;index++)
H0Ck%5 {
tz`T#9 if(hCallWnd[index]==NULL)
eAbp5}B continue;
u4.2u}A/R% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m$bDWxm#e {
&=hkB9
; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m0+'BC{$u bProcessed=TRUE;
[,|;rt\o> }
"y$s`n4Mj }
cK~VNzsz }
k|[86<&[ if(!bProcessed){
%n:ymc
$} for(int index=0;index<MAX_KEY;index++){
Ts
1 if(hCallWnd[index]==NULL)
]{PJ continue;
k{w if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
()%;s2>F SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
z)XIA)i6 }
b?%Pa\,! }
y`p(}X`> }
<<[\
Rv return CallNextHookEx( hHook, nCode, wParam, lParam );
F@Cxjz }
3IDX3cM9 anxwK47 BOOL InitHotkey()
YTYCv7 {
7F
1nBd if(hHook!=NULL){
#i0f}& nHookCount++;
>`u/#mrd return TRUE;
2RC@Fu~zaU }
Kzf^ras4u else
j`ybz G^ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
rz]M}!>k if(hHook!=NULL)
f`"@7-N nHookCount++;
25/OV"Z return (hHook!=NULL);
f,QBj{M, }
H=(Zx BOOL UnInit()
kCZxv"Ts {
A_JNj8<6r if(nHookCount>1){
Trt1M nHookCount--;
u<K{=94!e return TRUE;
Xhm)K3RA*T }
>XK |jPK BOOL unhooked = UnhookWindowsHookEx(hHook);
"?#O*x if(unhooked==TRUE){
#5}v? nHookCount=0;
T6N~L~J hHook=NULL;
".Sa[A;~ }
%hH@< <b(s return unhooked;
RLr^6+v)U }
\2NT7^H# +W[NgUrGJ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*ci%c^}V {
`as6IMqJD BOOL bAdded=FALSE;
Tg\wBhJr| for(int index=0;index<MAX_KEY;index++){
&24$*Oe if(hCallWnd[index]==0){
(H-}z`sy/@ hCallWnd[index]=hWnd;
2!;U.+( HotKey[index]=cKey;
ua]?D2 HotKeyMask[index]=cMask;
' bAdded=TRUE;
Yi+$g KeyCount++;
GBo'= break;
pA?2UZ }
2}jC%jR2 }
t'im\_$F return bAdded;
l~c# X3E }
FvT;8ik:3 8KyF0r? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"Iwd-#;$; {
Ch,%xs.)G BOOL bRemoved=FALSE;
VSW"/{Lp for(int index=0;index<MAX_KEY;index++){
*J|]E( if(hCallWnd[index]==hWnd){
Ab/KVB if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
k$v8cE hCallWnd[index]=NULL;
.:V4> HotKey[index]=0;
3}ATt". HotKeyMask[index]=0;
}hA h'*( bRemoved=TRUE;
YqNI:znm- KeyCount--;
_ !H8j/b break;
3}25=%;[ }
.Mu]uQUF }
g&`[r6B }
6
~d\+aV return bRemoved;
I4%25=0? }
,J ZM%f !y syb void VerifyWindow()
BOf)27) {
UVj1nom for(int i=0;i<MAX_KEY;i++){
PuoN<9 # if(hCallWnd
!=NULL){ q;#:nf"
if(!IsWindow(hCallWnd)){ ; 6*Ag#Z
hCallWnd=NULL;
fgE Mn;
HotKey=0; 3P[u>xE
HotKeyMask=0; /{HK0fd
KeyCount--; 5x1_rjP$|
} #23m_w^L
} 19#A7
} pSh$#]mZ`
} >S=,ype~G
\(a!U,]LM
BOOL CHookApp::InitInstance() QB|D_?]
{ JwMFu5 @
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Qb~&a1&s#
hins=AfxGetInstanceHandle(); IWD21lS
InitHotkey(); +KKx\m*
return CWinApp::InitInstance(); !-Br?
} IQA<xqX
SdOE^_@:
int CHookApp::ExitInstance() 4[^lE?+
{ }$T!qMst{
VerifyWindow(); r]'Q5l4j6"
UnInit(); 2B=''W
return CWinApp::ExitInstance(); n^7m^1to
} $dgez#TPL
.vJt&@NO
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file KXTx{R
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) At=l>
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \NI0rL
#if _MSC_VER > 1000 Vuu_Sd
#pragma once GtNGrJU
#endif // _MSC_VER > 1000 X=d;WT4,,
$bv l.c
class CCaptureDlg : public CDialog I}{Xv#@o
{ -yn;Jo2-
// Construction </B5^}
public: mbm|~UwD
BOOL bTray; b$Ch2Qz0q
BOOL bRegistered; &$
/}HND
BOOL RegisterHotkey(); 2E
X Rq
UCHAR cKey; EFKOElG(k
UCHAR cMask; fW'U7&O
void DeleteIcon(); Jxy94y*
void AddIcon(); G B&+EZ
UINT nCount; 61^5QHur
void SaveBmp(); 6bW:&IPQ;
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4;hgi[
// Dialog Data J}vxK
H#=
//{{AFX_DATA(CCaptureDlg) zxr|:KC ?&
enum { IDD = IDD_CAPTURE_DIALOG }; Cw_XLMY%V1
CComboBox m_Key; U'tfsf/V
BOOL m_bControl; +5BhC9=b
BOOL m_bAlt; 8Qg,UX
BOOL m_bShift; 3h|:ew[
CString m_Path; O7AW9*<
CString m_Number; /\_wDi+#
//}}AFX_DATA +#c3Y;JP
// ClassWizard generated virtual function overrides <Y9xHn&
//{{AFX_VIRTUAL(CCaptureDlg) oIP<7gz
public: tsA+B&R_]
virtual BOOL PreTranslateMessage(MSG* pMsg); NHCdf*
protected: m% {4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZAG iaq
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %EooGHGF?
//}}AFX_VIRTUAL :2KLziO2
// Implementation -&ic%0|f
protected: j5EZJ`
HICON m_hIcon; z|V5/"
// Generated message map functions >7VOytc
//{{AFX_MSG(CCaptureDlg) =nYd|Ok
virtual BOOL OnInitDialog(); '$3]U5KOwK
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z3 lZ3
afx_msg void OnPaint(); eL-9fld/n
afx_msg HCURSOR OnQueryDragIcon(); G Uf[Dz
virtual void OnCancel(); 9$ z|kwU
afx_msg void OnAbout(); ]S6`",+)<f
afx_msg void OnBrowse(); {1Z`'.FU
afx_msg void OnChange(); 5xm^[o2#y
//}}AFX_MSG Bw31h3yB
DECLARE_MESSAGE_MAP() pb(YA/
}; 3f2%+2Zjt,
#endif o
26R]
)Qe4J0.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >Q$, } `U;
#include "stdafx.h" =7JvS~s
#include "Capture.h" +ou
]|
#include "CaptureDlg.h" +P?!yH,n
#include <windowsx.h> P,x'1`k~
#pragma comment(lib,"hook.lib") nVF?.c
#ifdef _DEBUG |&+0Tg~ZE
#define new DEBUG_NEW hlpi-oW`
#undef THIS_FILE E|t.
3
static char THIS_FILE[] = __FILE__; d;3/Vr$t=
#endif W)dQyZ>J
#define IDM_SHELL WM_USER+1 k !S0-/h
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G[}$s7@k
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W0X/&v,k*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; phu`/1;p
class CAboutDlg : public CDialog z+K -aj w
{ ,9I %t%sb
public: Fb&Xy{kt1
CAboutDlg(); +>#SB"'
// Dialog Data jP?YV
//{{AFX_DATA(CAboutDlg) tiZ5
:^$b4
enum { IDD = IDD_ABOUTBOX }; IJxBPwh
//}}AFX_DATA 'u6T^Y S
// ClassWizard generated virtual function overrides L*xu<(>K
//{{AFX_VIRTUAL(CAboutDlg) -a``
protected: q6h'=By
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lo^0VD!O
//}}AFX_VIRTUAL Yj/aa0Ka4
// Implementation @6eM{3E.
protected: {sn RS)-
//{{AFX_MSG(CAboutDlg) "P)f,n
//}}AFX_MSG kdVc;v/5
DECLARE_MESSAGE_MAP() F)ak5
}; _MF:?p,l
J<g$hk
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &cDLSnR
{ B?BB
//{{AFX_DATA_INIT(CAboutDlg) 4~mYj@lvd
//}}AFX_DATA_INIT {E6M_qZ
} C`s
^}JGWGib=+
void CAboutDlg::DoDataExchange(CDataExchange* pDX) : GVyY]qBU
{ CH!>RRF
CDialog::DoDataExchange(pDX); 97 Oi}
//{{AFX_DATA_MAP(CAboutDlg) 0(!j]w"r3
//}}AFX_DATA_MAP mlq+Z#9
} Af~>}-`a
z_Em%X
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
-&N^S?
//{{AFX_MSG_MAP(CAboutDlg) _[D6WY+
// No message handlers ?T]` X
//}}AFX_MSG_MAP 05
P#gs`<
END_MESSAGE_MAP() Z>0a?=1[
5c(mgEvq
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F#0y0|
: CDialog(CCaptureDlg::IDD, pParent) OVwcjhQ
{ up(6/-/.7
//{{AFX_DATA_INIT(CCaptureDlg) L="ipM:Z
m_bControl = FALSE; >K|<hzZ
m_bAlt = FALSE; <OX_6d *@
m_bShift = FALSE; DdUT"%
m_Path = _T("c:\\"); Y[_{tS#u
m_Number = _T("0 picture captured."); Sz!mn
nCount=0; ,]A|z ~q
bRegistered=FALSE; `^:>sU
bTray=FALSE; g8=j{]~C
//}}AFX_DATA_INIT .A(QqL>
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #6fQ$x(F#j
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "!-
} Z2Q'9C},m
{RG4 m{#9
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C?xah?Sk
{ = aO1uC|6C
CDialog::DoDataExchange(pDX); 49('pq?D
//{{AFX_DATA_MAP(CCaptureDlg) Fe
r&X
DDX_Control(pDX, IDC_KEY, m_Key); &c?q#-^)\+
DDX_Check(pDX, IDC_CONTROL, m_bControl); A_8UPGh8
DDX_Check(pDX, IDC_ALT, m_bAlt); 6]%SSq&
DDX_Check(pDX, IDC_SHIFT, m_bShift); )JNUfauyT
DDX_Text(pDX, IDC_PATH, m_Path); %-lilo
DDX_Text(pDX, IDC_NUMBER, m_Number); ^bD)Tg5K
//}}AFX_DATA_MAP UyFvj4SU
} hSl6X3W
V(lxkEu/Fj
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VVd9VGvh
//{{AFX_MSG_MAP(CCaptureDlg) J Wh5gOXd
ON_WM_SYSCOMMAND() "YC5viX
ON_WM_PAINT() r$8(Q'
ON_WM_QUERYDRAGICON() tv]^k]n{rf
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]'.D@vFGO
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =pT}]
ON_BN_CLICKED(ID_CHANGE, OnChange) }s@
i
//}}AFX_MSG_MAP K~chOX
END_MESSAGE_MAP() c"wk_#
%@,%A_So k
BOOL CCaptureDlg::OnInitDialog() k<Y}BvAYB
{ ;bYpMcH
CDialog::OnInitDialog(); qS9z0HLE
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Ii.0Bul
ASSERT(IDM_ABOUTBOX < 0xF000); De<kkR{4
CMenu* pSysMenu = GetSystemMenu(FALSE); Hf$pwfGcY]
if (pSysMenu != NULL) IYG,nt!
{ vkj Hh.
CString strAboutMenu; c,yjsxETW
strAboutMenu.LoadString(IDS_ABOUTBOX); ov
'g'1}
if (!strAboutMenu.IsEmpty()) iBXS
{ \yE*nZ
pSysMenu->AppendMenu(MF_SEPARATOR); 'kBq@>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #0*oj/
} s7Z+--I)L
} 2lu A F2
SetIcon(m_hIcon, TRUE); // Set big icon { qJ(55
SetIcon(m_hIcon, FALSE); // Set small icon *SmR|Qy
m_Key.SetCurSel(0); J$D/-*/@
RegisterHotkey(); Z,"f2UJ
CMenu* pMenu=GetSystemMenu(FALSE); )azK&f@tR|
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z+5%.^Re
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?*/1J~<(@
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m\.(-
return TRUE; // return TRUE unless you set the focus to a control FoW|BGA~
} %7v!aJ40
/cX%XZg
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) sK/Z'h{|
{ Q/%]%d
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]kir@NMv>
{ -Q MO*PY
CAboutDlg dlgAbout; dcH@$D@~S
dlgAbout.DoModal(); Q3'L\_1L
} 2EC<8}CG
else h|{DIG3
{ `L
m9!?
CDialog::OnSysCommand(nID, lParam); MC~<jJ,
} ^|lw~F
} wv.HPmq
c\.7Z=D
void CCaptureDlg::OnPaint() SH5a&OVZhn
{ K}(@Ek
if (IsIconic()) =`OnFdI
{ gkFw=Cd
CPaintDC dc(this); // device context for painting 3{{Ew}kZm
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =5q_aK#i
// Center icon in client rectangle 2o<aEn&7|e
int cxIcon = GetSystemMetrics(SM_CXICON); -+z8bZ
int cyIcon = GetSystemMetrics(SM_CYICON); Zv5vYe9Ow
CRect rect; $g!iy'4n*
GetClientRect(&rect); ?_j]w%Hz
int x = (rect.Width() - cxIcon + 1) / 2; NI85|*h
int y = (rect.Height() - cyIcon + 1) / 2; +GL[uxe"
// Draw the icon )W^$7Em
dc.DrawIcon(x, y, m_hIcon); <T`&NA@%~$
} s-Qq#T
else BV)) #D9
{ i'3)5
CDialog::OnPaint(); Y(;u)uN_
} PB;j4
} 4Cp)!Bq?/
N gagzsJ=
HCURSOR CCaptureDlg::OnQueryDragIcon() v!j%<H`NI
{ C#@-uo2
return (HCURSOR) m_hIcon; }=fls=c/0
} Ge ?Q)N
cuh Z_l
void CCaptureDlg::OnCancel() 2Ft#S8
{ JOo+RA5d
if(bTray) &HtG&RvQf
DeleteIcon(); ~Z}DN*S
CDialog::OnCancel(); d0 mfqP=
} oC}2 Z{
ot,=.%O
void CCaptureDlg::OnAbout() F./P,hhN9
{ l{Xy %8
CAboutDlg dlg; ~_|CXPiQ8
dlg.DoModal(); q{XeRQ'/
} yL_\&v
t[:G45].-k
void CCaptureDlg::OnBrowse() {'6-;2&f
{ J~}i}|YC>
CString str; {yM@3v~
BROWSEINFO bi; 0Om<+]).R
char name[MAX_PATH]; #ds@!u+&
ZeroMemory(&bi,sizeof(BROWSEINFO)); g^))
bi.hwndOwner=GetSafeHwnd(); VgO.in^q
bi.pszDisplayName=name; Ee^>Q*wahw
bi.lpszTitle="Select folder"; \{54mM~
bi.ulFlags=BIF_RETURNONLYFSDIRS; y'_2|5!Qs
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a"8H(HAlNn
if(idl==NULL) .xe+cK
return; a6'T]DW0W
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8u"HW~~=
str.ReleaseBuffer(); m}]\ ^$d
m_Path=str; $1n\jN
if(str.GetAt(str.GetLength()-1)!='\\') )D"2Q:
m_Path+="\\"; %t%D|cf
UpdateData(FALSE); B<jVo%og
} ?&bB?mg\
Wb;D9Z
void CCaptureDlg::SaveBmp() -+WE9
{ 5>>JQ2'W
CDC dc; iZ 9ed]mf
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]~9YRVeC
CBitmap bm; G"U^]$(+K
int Width=GetSystemMetrics(SM_CXSCREEN); s,~g| I\
int Height=GetSystemMetrics(SM_CYSCREEN); *rmM2{6
bm.CreateCompatibleBitmap(&dc,Width,Height); Mh=j^ [4Q
CDC tdc; V"8w:?
tdc.CreateCompatibleDC(&dc); V L;<+C~
CBitmap*pOld=tdc.SelectObject(&bm); beFD}`
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8b< 'jft
tdc.SelectObject(pOld); |)%;B%
BITMAP btm;
M 9KoQS
bm.GetBitmap(&btm); MGsY3~!K
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]\*_}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $t.M`:G
BITMAPINFOHEADER bih; :~'R| l
bih.biBitCount=btm.bmBitsPixel; EU.!/'<
bih.biClrImportant=0; n7L|XkaQ
bih.biClrUsed=0; j5G=ZI86y
bih.biCompression=0; 1B~[L 5p9
bih.biHeight=btm.bmHeight; MGH2z:
bih.biPlanes=1; !CR#Fyt+9
bih.biSize=sizeof(BITMAPINFOHEADER); P9q ZjBS
bih.biSizeImage=size; R+tQvxp#
bih.biWidth=btm.bmWidth;
|A#\5u
bih.biXPelsPerMeter=0; ;8yEhar
bih.biYPelsPerMeter=0; 3y yVI#
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #1Iev7w
static int filecount=0; :Q"p!,X=-
CString name; 15M!erT
name.Format("pict%04d.bmp",filecount++); h/..cVD,K
name=m_Path+name; 1'b}Y8YO
BITMAPFILEHEADER bfh; NB3ar&.$S
bfh.bfReserved1=bfh.bfReserved2=0; a$$aM2.2
bfh.bfType=((WORD)('M'<< 8)|'B'); UL`%Xx
bfh.bfSize=54+size; 5QZ}KNJ|t~
bfh.bfOffBits=54; YD] :3!MI
CFile bf; 8BX9JoDi
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?7TuE!!M
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8p PQ
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9}'92
bf.WriteHuge(lpData,size); KU;J2Kt
bf.Close(); Pp`[E/
qj4
nCount++; *&~
'
} dlBr2 9
GlobalFreePtr(lpData); -V=,x3Zew
if(nCount==1) _Q7]Dw/w\
m_Number.Format("%d picture captured.",nCount); /g$8JL
else QI`&N(n
m_Number.Format("%d pictures captured.",nCount); +<fT\Oq#
UpdateData(FALSE); @s|yH"
} JN3&(t
\6;b.&%w2
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {~ 1
~V
{ G!7A]s>C
if(pMsg -> message == WM_KEYDOWN) E6#")2C~
{ 34 I Cn~
if(pMsg -> wParam == VK_ESCAPE) p%IVWeZnx
return TRUE; ?~/_&=NSx
if(pMsg -> wParam == VK_RETURN) W$:D#;jz`h
return TRUE; fr8hT(,s)
} Gk!CU"`sP
return CDialog::PreTranslateMessage(pMsg); &_,.*tha
} 5EL&?\e
3 ]w a8|
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /@0
{ i: 7cdhz
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ lhB;jE
SaveBmp(); 1aoKf F(
return FALSE; vWjHHw
} U,Th-oU
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /`g~lww2O
CMenu pop; i7\MVI8
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Su*Pd;
CMenu*pMenu=pop.GetSubMenu(0); 8r48+_y3u
pMenu->SetDefaultItem(ID_EXITICON); tLM/STb6
CPoint pt; U\dLq&=V
GetCursorPos(&pt); D{M&>.
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a@m
64l)
if(id==ID_EXITICON) _vUId?9@+e
DeleteIcon(); GSVLZF'+
else if(id==ID_EXIT) fT5vO.a
OnCancel(); :xC1Ka%~
return FALSE; 4_ kg/
} #ib?6=sPC
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wSG!.Ejc7
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G<`6S5J>hr
AddIcon(); r_pZK(G%
return res; 2E@g#:3
} o^+g2;Ro
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void CCaptureDlg::AddIcon() 7$"n.cr
:
{ Em/? 4&
NOTIFYICONDATA data; '@WS7`@-y
data.cbSize=sizeof(NOTIFYICONDATA); B X Et]+Q
CString tip; L+.-aB2!d
tip.LoadString(IDS_ICONTIP); PF0AU T
data.hIcon=GetIcon(0); HlXEU$e
data.hWnd=GetSafeHwnd(); dQ_yb+<
strcpy(data.szTip,tip); VIuzBmR|\
data.uCallbackMessage=IDM_SHELL; s \q
m
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #=czqZw
data.uID=98; j9*5Kj
Shell_NotifyIcon(NIM_ADD,&data); d ZxrIWx
ShowWindow(SW_HIDE); 2(25IYMS8
bTray=TRUE; Vs,
&
} 0>U7]wZKc
7rIEpN>*
void CCaptureDlg::DeleteIcon() A<[BR*n
{
P5`BrY,hZ
NOTIFYICONDATA data; 8WLBq-]G
data.cbSize=sizeof(NOTIFYICONDATA); Dj'+,{7,u
data.hWnd=GetSafeHwnd(); M`,`2I A
data.uID=98; /C/I_S}H
Shell_NotifyIcon(NIM_DELETE,&data); uex([;y
ShowWindow(SW_SHOW); :-e[$6}S
SetForegroundWindow(); II{"6YI>
ShowWindow(SW_SHOWNORMAL); q uiX"lV(
bTray=FALSE; ~jMfm~
} r%xf=};
/`b`ai8`8
void CCaptureDlg::OnChange() yu$xQ~ o
{ 8P*wt'Q$
RegisterHotkey(); }PxPJ$o
} UI74RP
_PGS"O?j
BOOL CCaptureDlg::RegisterHotkey() . 12H/F
{ b^WF
R
UpdateData(); mxmj
UCHAR mask=0; ]ujXPK=t
UCHAR key=0; U&u~i
3
if(m_bControl) YI+o:fGC5
mask|=4; rz.`$
if(m_bAlt) mEq>{l:
mask|=2;
u'qc=5
if(m_bShift) l'kVi
mask|=1; &6\f;T4
key=Key_Table[m_Key.GetCurSel()]; {1[f9uPS
if(bRegistered){ !'8jy_<9
DeleteHotkey(GetSafeHwnd(),cKey,cMask); i} ?\K>BWq
bRegistered=FALSE; @~`:sa+H
} p%- m"u
cMask=mask; {lN G:o
cKey=key; UaM&/K9
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 30Udba+{]p
return bRegistered; YAYwrKt
} gCv[AIE_m
?xb2jZ/0X
四、小结 |]tsf
/SA
=7Sw29u<
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。