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:
Upc_"mkI.
{afIr1j/m 一、实现方法
`Js"*[z 1Uc/r>u9 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:
I7;|`jN5K %d0BQ| #pragma data_seg("shareddata")
}n k[WW HHOOK hHook =NULL; //钩子句柄
!dwa. lZ&X UINT nHookCount =0; //挂接的程序数目
@,q <CF@Y static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
>%c>R'~h static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
l(Uwci static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
rrs0|= static int KeyCount =0;
!wo static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
G9~ 4?v6: #pragma data_seg()
/!pJ" @ Yo}QW;,g 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。
CH0Nkf j
HEt
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:
m :2A[H+ q]Af I( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
D1wONss cKey,UCHAR cMask)
{Ok]$0L {
-=2V4WU~ BOOL bAdded=FALSE;
$g
}aH(vf for(int index=0;index<MAX_KEY;index++){
V17!~ if(hCallWnd[index]==0){
Eu[/* t+l hCallWnd[index]=hWnd;
4
udW6U HotKey[index]=cKey;
qy/t<2' HotKeyMask[index]=cMask;
Wfsd$kN6{ bAdded=TRUE;
be
HEAQ KeyCount++;
d_Z?i#r0l break;
rs0Wy
}
lB }
,-SWrp`f return bAdded;
\$xj>b; }
?:i,%]zxC //删除热键
lPg?Fk7AP BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-o@L"C> {
=tc!"{ BOOL bRemoved=FALSE;
)<
p
~ for(int index=0;index<MAX_KEY;index++){
^]?juL if(hCallWnd[index]==hWnd){
bg^<e}{<H if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
z6 .^a-sU5 hCallWnd[index]=NULL;
m-<m[ 49 HotKey[index]=0;
T1(*dVU? HotKeyMask[index]=0;
ULzrJbP'7 bRemoved=TRUE;
o`Q.;1(Y' KeyCount--;
R#W=*cN break;
CsN^u H }
di37 }
f8)fm2^09 }
"-Wb[*U; return bRemoved;
NJg )S2]7 }
EvF[h:C2 @iN"]GFjS 0@Z}.k30 DLL中的钩子函数如下:
H'&[kgnQ@ EKEJ9Y+47H LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0x fF {
bP&1tE BOOL bProcessed=FALSE;
&"^U=f@v if(HC_ACTION==nCode)
==EB\>g| {
9A *gW j if((lParam&0xc0000000)==0xc0000000){// 有键松开
U+&Eps&NI switch(wParam)
9^@)R
ED {
KCnm_4 case VK_MENU:
/|isRh| MaskBits&=~ALTBIT;
Pk;YM} break;
*NC@o* case VK_CONTROL:
?@;#|^k9
MaskBits&=~CTRLBIT;
y2=yh30L0E break;
:TkMS8 case VK_SHIFT:
L2OR<3*|Av MaskBits&=~SHIFTBIT;
IL`=r6\ break;
=Q*3\)7 default: //judge the key and send message
fg4mP_ break;
<LN7+7} }
%*#+(A"V for(int index=0;index<MAX_KEY;index++){
`@#rAW D if(hCallWnd[index]==NULL)
ABcB-V4 continue;
YLuf2ja}X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
',/2J0_ {
W||&Xb SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.eLd0{JtN bProcessed=TRUE;
iUk#hLLC }
zE~Xxp }
o7@C$R_# }
PbsxjP else if((lParam&0xc000ffff)==1){ //有键按下
n]i#&[*A( switch(wParam)
I5 qrHBJ > {
l]OzE-*$b case VK_MENU:
c=X+uO- MaskBits|=ALTBIT;
m"QDc[^Ge break;
Xt
+9z case VK_CONTROL:
ILqBa:J MaskBits|=CTRLBIT;
(>NZYPw^3 break;
aemi;61T\ case VK_SHIFT:
opMnLor MaskBits|=SHIFTBIT;
Je}0KW3G9L break;
+wxsAGy_j default: //judge the key and send message
c94=>p6 break;
Qxk & J }
o4wSt6gBcJ for(int index=0;index<MAX_KEY;index++){
@0d"^ if(hCallWnd[index]==NULL)
MzDosr3: continue;
b'Km-'MtH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"p7nngn~ {
U_l9CZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
B{*{9!(l9 bProcessed=TRUE;
Gr#3GvL }
u@CQ+pnf:( }
l qKj;' }
!-%XrU8o3 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
" m13HS for(int index=0;index<MAX_KEY;index++){
`.J17mQe" if(hCallWnd[index]==NULL)
>H ?k0M`L continue;
w
?*eBLJ(G if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
gY8$Rk
% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.ws86stFSb //lParam的意义可看MSDN中WM_KEYDOWN部分
~clX2U8u` }
kDI?v6y5 }
!?=U{^|7y }
9\c]I0)3p return CallNextHookEx( hHook, nCode, wParam, lParam );
? ^W1WEBm }
,[)l>!0\H ~?FhQd\Q 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:
gn&Zt}@[ )BvMFwQG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Hf\sF(, ( BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kguZ AO6 gu+zfvkcY 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:
6su~SPh |<5F08]v LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Fm,` ]CO {
`j(._`8%a if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/R&h#;l {
Gx6%Z$2n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
zRou~Kxi SaveBmp();
.Z
67 return FALSE;
y^ |u'XK }
][
I OlR …… //其它处理及默认处理
&N._}ts }
_+'!l'` -Ep#q&\
\2e^x 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
`$S&:Q, &JcatI 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。
-5 D<zP/ %1.F;-GdsW 二、编程步骤
"ayV8{m^3 %9a3$OGZX 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
BdF/(Pg 5af0- hj 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
brs`R#e \ ninWnQq 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
-v.\W y~\ &i(Ip'r 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
KE@+I.x ]B?M3`'> 5、 添加代码,编译运行程序。
Hd\V?#H dpw-a4o} 三、程序代码
(u} /(Ux FV/t ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
oV0T
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
9K/EteS #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
V<J1.8H
#if _MSC_VER > 1000
[I3Nu8 #pragma once
;=jF9mV. #endif // _MSC_VER > 1000
LwK]fFtu #ifndef __AFXWIN_H__
o_BTo5] #error include 'stdafx.h' before including this file for PCH
jD6HCIjd' #endif
Q_|}~4_+ #include "resource.h" // main symbols
8c+V$rH_ class CHookApp : public CWinApp
"(7y%TFt: {
}o*A>le public:
)q-NE) CHookApp();
T\uIXL?3 // Overrides
W.MZN4= // ClassWizard generated virtual function overrides
_huJ*W7lR //{{AFX_VIRTUAL(CHookApp)
e;"J,7@ public:
C2"^YRN, virtual BOOL InitInstance();
l|?tqCT ^h virtual int ExitInstance();
H3<tsK=: //}}AFX_VIRTUAL
i7XY3yhC //{{AFX_MSG(CHookApp)
YWl#!"- // NOTE - the ClassWizard will add and remove member functions here.
$t.oGd@N // DO NOT EDIT what you see in these blocks of generated code !
c
'wRGMP //}}AFX_MSG
jez0 A DECLARE_MESSAGE_MAP()
gVfFEF. };
z R?R,k)m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
jRU:un4 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N*}soMPV^. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JM|HnyI BOOL InitHotkey();
"u!gfG?oH BOOL UnInit();
dX cbS< #endif
5MaN
{*)l 6/mz.,g2 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
,<t.Iz% #include "stdafx.h"
L
AasmQ #include "hook.h"
@6>Q&GYqt #include <windowsx.h>
tfGs|x #ifdef _DEBUG
$G9LaD#;M #define new DEBUG_NEW
AAlc %d/9 #undef THIS_FILE
|p&EP2?T static char THIS_FILE[] = __FILE__;
LJ/He[r|[ #endif
S3ooG1 4Ls #define MAX_KEY 100
N7_eLhPt*8 #define CTRLBIT 0x04
1fS&KO{a #define ALTBIT 0x02
>] 'oN #define SHIFTBIT 0x01
;rT'~?q #pragma data_seg("shareddata")
cQ j`W
* HHOOK hHook =NULL;
1"ZtE\{
" UINT nHookCount =0;
+9b{Y^^~T static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
LBCH7@V1yR static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
>nghFm static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
9f( X7kt static int KeyCount =0;
UrizZ5a static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0]|`*f&p; #pragma data_seg()
m7'<k1#"Y HINSTANCE hins;
0w3c8s. void VerifyWindow();
FfJ;r'eGs BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
?l/6DT>e //{{AFX_MSG_MAP(CHookApp)
0vm> *M*p // NOTE - the ClassWizard will add and remove mapping macros here.
hLLSmW( // DO NOT EDIT what you see in these blocks of generated code!
O D}RnKL //}}AFX_MSG_MAP
~~OFymQ%?q END_MESSAGE_MAP()
CvY+b^ ; hTX[W%K CHookApp::CHookApp()
pY"WW0p"C {
ls^Z"9P // TODO: add construction code here,
`|ie#L(:7/ // Place all significant initialization in InitInstance
^el+ej/= }
@./h$]6 H~+A6g]T CHookApp theApp;
>o?v[:u* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"#r)NYq`"| {
}8ubGMr,Y BOOL bProcessed=FALSE;
7EE{*}?0E if(HC_ACTION==nCode)
9;e!r DW,# {
kP
]Up&' if((lParam&0xc0000000)==0xc0000000){// Key up
f$xXR$mjf switch(wParam)
n^4R]9U {
Ik0g(-d case VK_MENU:
\FVfV`x MaskBits&=~ALTBIT;
Qu61$! break;
nnv|GnQST case VK_CONTROL:
,/{e%J MaskBits&=~CTRLBIT;
k."p& break;
\~
D(ww case VK_SHIFT:
-eG~ MaskBits&=~SHIFTBIT;
2IJK0w@ break;
\;X7DK2 default: //judge the key and send message
W "'6M=* break;
oFWb.t9< }
1#A$&'&\J; for(int index=0;index<MAX_KEY;index++){
CQ!pt@|d if(hCallWnd[index]==NULL)
3PNdc}h continue;
' P?h?w^T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y@3p5o9lv- {
t%lat./yT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
H$h#n~W~ bProcessed=TRUE;
YExgUE| }
l^lb ^"o }
arYq$~U }
pZnp!!G else if((lParam&0xc000ffff)==1){ //Key down
.G O0xnm switch(wParam)
tqGrhOt {
5?7AzJl> case VK_MENU:
@j/2 $ MaskBits|=ALTBIT;
%\m"Yi] break;
;,&cWz case VK_CONTROL:
3v8LzS3@ MaskBits|=CTRLBIT;
MET9rT break;
FH~:&; case VK_SHIFT:
!T`oHs MaskBits|=SHIFTBIT;
Xqf,_I=V break;
N[e,){v default: //judge the key and send message
yaj dRU break;
` =>}*GS }
4Z)s8sD KW for(int index=0;index<MAX_KEY;index++)
|./mPV r {
p%Z:SZZ if(hCallWnd[index]==NULL)
G4)~p!TSQ continue;
MR#*/Iw~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
za_b jE {
3:+9H}Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%_OjmXOfe bProcessed=TRUE;
^#Ii=K-[^ }
I^y<W%Et }
YWFE*wQ! }
^jL '*&l if(!bProcessed){
m@Z# for(int index=0;index<MAX_KEY;index++){
y}?|+/ dN if(hCallWnd[index]==NULL)
<`}P continue;
Pxlc RF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
']M/'CcM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:7v'[b }
BQ-x#[%s }
&`r/+B_W }
uz8LF47@:- return CallNextHookEx( hHook, nCode, wParam, lParam );
U2
*ORd }
U+Y(: ~aob@( BOOL InitHotkey()
8SGaS& {
jeC=s~ if(hHook!=NULL){
c[h~=0UtJ nHookCount++;
@aIgif+v return TRUE;
@5>#<LV=E# }
cLtVj2Wb else
U$OZkHA[ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
39X~<\&' if(hHook!=NULL)
R;< q<i_l nHookCount++;
4b;Mb return (hHook!=NULL);
=oBpS=<7 }
KdVKvs[ BOOL UnInit()
X6Ha C+P {
02-ql
F@i if(nHookCount>1){
MEDh nHookCount--;
kK? SG3 return TRUE;
PYkhY;* }
#Bd]M#J17a BOOL unhooked = UnhookWindowsHookEx(hHook);
bZnOX*y] if(unhooked==TRUE){
6D;N.wDZ nHookCount=0;
SVCh!/qe\ hHook=NULL;
p*
>z:= }
}3(!kW return unhooked;
1JJsYX }
owAO&"C $dL..QH^K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
y*
+y& {
Y}?8 BOOL bAdded=FALSE;
W2vL< for(int index=0;index<MAX_KEY;index++){
DR#" 3 if(hCallWnd[index]==0){
2\xw2VQ@P hCallWnd[index]=hWnd;
~7]V^tG HotKey[index]=cKey;
*8}b&4O~ HotKeyMask[index]=cMask;
t-\+t<; bAdded=TRUE;
Q0U~s\< KeyCount++;
wI%M3XaBws break;
B8@mL-Z-; }
/5@YZ?|#2 }
&.)=>2 return bAdded;
|2(q9j }
+,Eam6g{ '/d51 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pj>R9zpn_ {
qmrT dG BOOL bRemoved=FALSE;
_#8hgwf> for(int index=0;index<MAX_KEY;index++){
yaUtDC.| if(hCallWnd[index]==hWnd){
!=[Y yh if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q}{E![ZTu hCallWnd[index]=NULL;
) c@gRb~ HotKey[index]=0;
tLE8+[
SU HotKeyMask[index]=0;
1.3#PdMR, bRemoved=TRUE;
q
W(@p` KeyCount--;
M:+CW;||! break;
,-UF5U }
KOcB#UHJ }
Bkcwl }
eaw!5]huu return bRemoved;
^m\o(R }
Kd\0nf6 LmrdVSs_ void VerifyWindow()
&.A_d+K& {
wi2`5G6|z for(int i=0;i<MAX_KEY;i++){
^z?b6kTC if(hCallWnd
!=NULL){ (v]%kXy/G
if(!IsWindow(hCallWnd)){ 3?93Pj3oPt
hCallWnd=NULL; 3[m~-8
HotKey=0; @r"\bBi
HotKeyMask=0; g4?2'G5m?
KeyCount--; Oa[
} %|-N{> wKy
} |XyX%5p*
} C=?S
} X 4;U4pU#
`4"8@>D
BOOL CHookApp::InitInstance() W}(A8g#6
{ ]S2rqKB
AFX_MANAGE_STATE(AfxGetStaticModuleState()); )2f#@0SVL
hins=AfxGetInstanceHandle(); SB62(#YR
InitHotkey(); _"8n&=+
return CWinApp::InitInstance(); kg/ B<w'
} i VSNara
:5YIoC
int CHookApp::ExitInstance() ]N>ZOV,>
{ |$Yk)z3
VerifyWindow(); sI>w#1.m/&
UnInit(); 0seCQANd
return CWinApp::ExitInstance(); ]*0zir/
} [|nK5(e9
E7uIur=g!
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]c(FgYc
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +R'8$
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PRhC1#
#if _MSC_VER > 1000 I%T+H[,
#pragma once $>rt0LOF
#endif // _MSC_VER > 1000 %4~"$kE
1/dL-"*0
class CCaptureDlg : public CDialog $AK
^E6
{ j=sfE qN).
// Construction
[gW eD
public: :jiEn
y
BOOL bTray; Fis!MMh.$
BOOL bRegistered; n
Kkpp-
BOOL RegisterHotkey(); k!c7eP"%8^
UCHAR cKey; HE}0_x.
UCHAR cMask; mxlh\'b
void DeleteIcon(); Xaz "!
void AddIcon(); [4Q;(67
UINT nCount; [&TF]az
void SaveBmp(); Qz(D1>5I?
CCaptureDlg(CWnd* pParent = NULL); // standard constructor )*KMU?
// Dialog Data 9*"
//{{AFX_DATA(CCaptureDlg) -]3 K#M)s
enum { IDD = IDD_CAPTURE_DIALOG }; (HNc9QVC'W
CComboBox m_Key; Mc,79Ix"
BOOL m_bControl; ,np=m17
BOOL m_bAlt; 2Kxb(q"
BOOL m_bShift; v93b8/1
CString m_Path; {&1L &f<
CString m_Number; cy%M$O|hX5
//}}AFX_DATA _}[
Du/c
// ClassWizard generated virtual function overrides }?[];FB
//{{AFX_VIRTUAL(CCaptureDlg) gM96RY
public: !Dd'*ee-;
virtual BOOL PreTranslateMessage(MSG* pMsg);
,,H5zmgA
protected: VDxm|7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k1Y\g'1
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); M;A_'h?Z
//}}AFX_VIRTUAL [RF,0>^b
// Implementation Ym'h
vK
protected: 1_Yx]%g<
HICON m_hIcon; H/a gt
// Generated message map functions N* gJu
//{{AFX_MSG(CCaptureDlg) !W}sOK7#
virtual BOOL OnInitDialog(); "L>'X22ed
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N{Sp-J>
afx_msg void OnPaint(); @IG's-
afx_msg HCURSOR OnQueryDragIcon(); !)a_@d.;i
virtual void OnCancel(); )fJ"Hq
afx_msg void OnAbout(); CJ<nUIy'z
afx_msg void OnBrowse(); y|LHnNQ
afx_msg void OnChange(); %&L13:
//}}AFX_MSG QK_5gD`$a,
DECLARE_MESSAGE_MAP() VEps|d3,,
}; |\(uO|)ju
#endif &8IBf8
^J^,@Hf_
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QE]'Dc%
#include "stdafx.h" ]J Yz(m[
#include "Capture.h" +C%6jGGh
#include "CaptureDlg.h" 0|e[o"
#include <windowsx.h> bQ*yXJ^8
#pragma comment(lib,"hook.lib") 4\z@Evm
#ifdef _DEBUG IO)Y0J>x
#define new DEBUG_NEW qda 2
#undef THIS_FILE ebA:Sq:w
static char THIS_FILE[] = __FILE__; dIC\U
#endif 0)&!$@HW
#define IDM_SHELL WM_USER+1 x%dny]O1;
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M`Y^hDl 6
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Nj9A-*0g6N
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; FC0fe_U(F
class CAboutDlg : public CDialog _c-3eQ1
{ V.Hv6
public: N,Y)'s<
CAboutDlg(); Zc7;&cz
// Dialog Data 7|}4UXr7y
//{{AFX_DATA(CAboutDlg) P@N+jS`Vf
enum { IDD = IDD_ABOUTBOX }; <+QdBp'd;
//}}AFX_DATA GDLw_usV
// ClassWizard generated virtual function overrides xvl$,\iqE
//{{AFX_VIRTUAL(CAboutDlg) P<pv@l9)
protected: ~b_DFj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UytMnJ88
//}}AFX_VIRTUAL 12 p`ZD=
// Implementation |))NjM'ZBl
protected: *'((_NZ>
//{{AFX_MSG(CAboutDlg) GxdAOiq;
//}}AFX_MSG t:10
DECLARE_MESSAGE_MAP() #xtH6\X
}; +bumWOQ'
*PF<J/Pr
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0B.Gt&Oal
{ )Do 0
//{{AFX_DATA_INIT(CAboutDlg) =MNp;
//}}AFX_DATA_INIT yGR{-YwU!
} *OLqr/ yb
1Q@]b_"Xh
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .UPh
{ `7/(sX.
CDialog::DoDataExchange(pDX); =WTSaC
//{{AFX_DATA_MAP(CAboutDlg) svpQ.Q
//}}AFX_DATA_MAP H<d~AurX)J
} 7d;|?R-8D
HzTmNm)
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P&0eu
//{{AFX_MSG_MAP(CAboutDlg) 8'PZA,CW
// No message handlers fo ~uI(rk
//}}AFX_MSG_MAP wm~7`&
END_MESSAGE_MAP() |62` {+
ceUe*}\cr
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B=0^Rysg
: CDialog(CCaptureDlg::IDD, pParent) ~i|6F~%3
{ b,'O|s]"Sc
//{{AFX_DATA_INIT(CCaptureDlg) 01A{\O1$j
m_bControl = FALSE; `
-_! %m/
m_bAlt = FALSE; 8w5}9}xF
m_bShift = FALSE; ;e?M;-
m_Path = _T("c:\\"); ?[JP[
qS
m_Number = _T("0 picture captured."); J*;RL`
nCount=0; nH#>_R
(
bRegistered=FALSE; C hF~
bTray=FALSE; 5%jhVys23
//}}AFX_DATA_INIT <YyE1|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (%6fMVp
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |nNcV~%~
} Sf?;j{?G
Qu|CXUk
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =F+v+zP7P
{ v~mVf.j1
CDialog::DoDataExchange(pDX); ?+]=|hN
//{{AFX_DATA_MAP(CCaptureDlg) p@jw)xI
DDX_Control(pDX, IDC_KEY, m_Key); i.mv`u Dm
DDX_Check(pDX, IDC_CONTROL, m_bControl); M@ U>@x;
DDX_Check(pDX, IDC_ALT, m_bAlt); OjGI
!
DDX_Check(pDX, IDC_SHIFT, m_bShift); :8`A
DDX_Text(pDX, IDC_PATH, m_Path);
KQr+VQdq>
DDX_Text(pDX, IDC_NUMBER, m_Number); 03~ ADj
//}}AFX_DATA_MAP RqA>" [L
} W %*#rcdq
O,r;-t4vYU
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g<Z :`00|
//{{AFX_MSG_MAP(CCaptureDlg) R/=rNUe
ON_WM_SYSCOMMAND() Ll]5u~
ON_WM_PAINT() CXq[VYM&X
ON_WM_QUERYDRAGICON() 81Z;hO"~
ON_BN_CLICKED(ID_ABOUT, OnAbout) >ai,6!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
*L^W[o
ON_BN_CLICKED(ID_CHANGE, OnChange) L$5,RUy
//}}AFX_MSG_MAP 6q^$}eOt
END_MESSAGE_MAP() A|ZT;\
@1*^ttC
BOOL CCaptureDlg::OnInitDialog() 3L&:
{ 3m>YR-n$
CDialog::OnInitDialog(); 7${<u 0((!
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `G$>T#Dq
ASSERT(IDM_ABOUTBOX < 0xF000); BA h'H&;V
CMenu* pSysMenu = GetSystemMenu(FALSE); ei5YxV6I
if (pSysMenu != NULL) }5+^
{ H~FI@Cf$L
CString strAboutMenu; >+{WiZ`
strAboutMenu.LoadString(IDS_ABOUTBOX); Ksx-Y"
if (!strAboutMenu.IsEmpty()) S>oEk3zlw
{ QoYEWXT|g
pSysMenu->AppendMenu(MF_SEPARATOR); pA!-spgX
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cKVFykwM
} e\6H.9=
} ^*AI19w!Ys
SetIcon(m_hIcon, TRUE); // Set big icon U<'N=#A
J
SetIcon(m_hIcon, FALSE); // Set small icon {T8;-H0H
m_Key.SetCurSel(0); SW9
C
8Q
RegisterHotkey(); {b!{~q
CMenu* pMenu=GetSystemMenu(FALSE); YdhV
a!Y
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "W(D0oy
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g}W`LIasv
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); E+\?ptw
return TRUE; // return TRUE unless you set the focus to a control e0(/(E:
} z"4 q%DC
5Cdn
j
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]o'o
v
{ &GLDoLk6[
if ((nID & 0xFFF0) == IDM_ABOUTBOX) k-ZO/yPo
{ w'TAM"D`
CAboutDlg dlgAbout; 'x%gJi#
dlgAbout.DoModal(); YYT;a$GTo
} M86"J:\u]
else p)SW(pS
{ mOJdx-q?r
CDialog::OnSysCommand(nID, lParam); BeUyt
} Bc8&-eZ,
} 5|rBb[
n.@HT"
void CCaptureDlg::OnPaint() &@6xu{o
{ Ll
KO(Q{"
if (IsIconic()) EGl<oxL*R2
{ ZS.=GjK
CPaintDC dc(this); // device context for painting M@T{uo
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "w?0f["
// Center icon in client rectangle <,:{Q75
int cxIcon = GetSystemMetrics(SM_CXICON); X(tx8~z
int cyIcon = GetSystemMetrics(SM_CYICON); e(s0mbJE
CRect rect; 6_%Cd`4Z
GetClientRect(&rect); N[cIr{XBGN
int x = (rect.Width() - cxIcon + 1) / 2; +mrLMbBiD
int y = (rect.Height() - cyIcon + 1) / 2; J|I*n
// Draw the icon K9@.l~n
dc.DrawIcon(x, y, m_hIcon); neU=1socJ
} Y*BmBRN
else Jh.~]\u
{ uUjjAGZ
CDialog::OnPaint(); J'2 Yrn
} uqcG3Pi
} &MH8~LSb
J?V$V
>d
HCURSOR CCaptureDlg::OnQueryDragIcon() byI"
?
{ TyV~2pcN
return (HCURSOR) m_hIcon; L!:NL#M
} I7_8oq\3D
k<1i.rh
void CCaptureDlg::OnCancel() 2{j$1EdI@-
{ _|\X8o_
if(bTray) 0f5 ag&
DeleteIcon(); -1dD~S$
CDialog::OnCancel(); >T;!Z 5L1
} &KMI C
Lyc6nP;F
void CCaptureDlg::OnAbout() N)mZ!K44
{ ?pIELezfK
CAboutDlg dlg; ` +YtTK
dlg.DoModal(); 8(Az/@=n
} ~g!!#ad
p*PzfSLN
void CCaptureDlg::OnBrowse() ,6]ID1o:y
{ YH58p&up
CString str; = 9Yfo,F
BROWSEINFO bi; fuj9x;8X0
char name[MAX_PATH]; VKPEoy8H
ZeroMemory(&bi,sizeof(BROWSEINFO)); wa,`BAKJ+F
bi.hwndOwner=GetSafeHwnd(); 3u
j|jwL
bi.pszDisplayName=name; S
}`f&
bi.lpszTitle="Select folder"; f2c<-}wR
bi.ulFlags=BIF_RETURNONLYFSDIRS; K1X-<5]{
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y-})/zFc
if(idl==NULL) D zD5n
return; .iV=ybMT
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <h#7;o
str.ReleaseBuffer(); 3m&r?xZs
m_Path=str; Ar\fA)UQ`
if(str.GetAt(str.GetLength()-1)!='\\') 8Ze>
hEG
m_Path+="\\"; c(1tOQk.
UpdateData(FALSE); 7KiraKb|
} P?q HzNGi7
@{b5x>KX
void CCaptureDlg::SaveBmp() 29grb P
{ mW]dhY 3X
CDC dc; xp1/@Pw?
dc.CreateDC("DISPLAY",NULL,NULL,NULL); jUE:QOfRib
CBitmap bm; S$SCW<LuN
int Width=GetSystemMetrics(SM_CXSCREEN); 2W0nA t
int Height=GetSystemMetrics(SM_CYSCREEN); hRXnig{;3
bm.CreateCompatibleBitmap(&dc,Width,Height); Vsi:O7|+
}
CDC tdc; >e;jGk?-
tdc.CreateCompatibleDC(&dc); ZNH-0mk
CBitmap*pOld=tdc.SelectObject(&bm); 1
K}gX>F
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~Q=;L>Qd
tdc.SelectObject(pOld); 97 SS0J
BITMAP btm; oC"
[rn
bm.GetBitmap(&btm); {$EX :ID
DWORD size=btm.bmWidthBytes*btm.bmHeight; a)W|gx6Y
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y
22Ai
BITMAPINFOHEADER bih; pF6u3]
bih.biBitCount=btm.bmBitsPixel; *
4J!@w
bih.biClrImportant=0; "tl{HM5u
bih.biClrUsed=0; JjZB!Lg=
bih.biCompression=0; vFHeGq70j
bih.biHeight=btm.bmHeight; `=;}I@]zj)
bih.biPlanes=1; r]LP=K1
bih.biSize=sizeof(BITMAPINFOHEADER); *-*V>ntvT$
bih.biSizeImage=size; nZ=[6?
bih.biWidth=btm.bmWidth; sR$abN+u
bih.biXPelsPerMeter=0; B tznms'
bih.biYPelsPerMeter=0; Q^<amM!
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N'{Yhx u
static int filecount=0; ~I N g9|
CString name; :kcqf,7
name.Format("pict%04d.bmp",filecount++); g:RS7od=,
name=m_Path+name; 6v{&, q
BITMAPFILEHEADER bfh; fahQ^#&d`
bfh.bfReserved1=bfh.bfReserved2=0; QN;5+p[N
bfh.bfType=((WORD)('M'<< 8)|'B'); Mm,\e6#*
bfh.bfSize=54+size; 3 US`6Y"
bfh.bfOffBits=54; YCP D+
CFile bf; ta.Lq8/
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KiG19R$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3KqRw (BK
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !DA4q3-U>>
bf.WriteHuge(lpData,size); q;R&valn
bf.Close(); @G]*]rkKb
nCount++; 2Rys:$
} enxb
pq#
GlobalFreePtr(lpData); gWjYS#D
if(nCount==1) B{0]v-w
m_Number.Format("%d picture captured.",nCount); FnVW%fh
else B!<B7Q
m_Number.Format("%d pictures captured.",nCount); |{|B70v3Co
UpdateData(FALSE); R7b-/
!L
} Vxrj(knck,
M&=SvM.f
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 7]So=%q
{ LTBH/[q5
if(pMsg -> message == WM_KEYDOWN) tMdSdJ8
{ ({Yfsf,
if(pMsg -> wParam == VK_ESCAPE) 7Z+Fjy-B
return TRUE; s8:epcL`A
if(pMsg -> wParam == VK_RETURN) Msvs98LvW
return TRUE; ]~$@x=p2e
} ~:,}?9
return CDialog::PreTranslateMessage(pMsg); _Cf:\Xs
m
} nGTGX
Ax|'uvVAPT
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CUdpT$ $x3
{ .>,Y
|
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _3u3b/%J?
SaveBmp(); D;2V|CkU
return FALSE; 3qGz(6w6E
} ~ecN4Oo4q;
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?.ObHV*k
CMenu pop; C3.]dsv:
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]?}pJ28
CMenu*pMenu=pop.GetSubMenu(0); +(`D'5EB(
pMenu->SetDefaultItem(ID_EXITICON); s`Z.H5V>\
CPoint pt; '% _K"rb
GetCursorPos(&pt); `"'u
mIz
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); QgH{J80
if(id==ID_EXITICON) ekfa"X_
DeleteIcon(); ^Rl?)_)1HE
else if(id==ID_EXIT) i\Yd_
OnCancel(); %q r,Ssa/
return FALSE; 5mVO9Qj
} YG?4DF
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &B:L9^
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [+5g 9tBJ
AddIcon(); X:f5t` ;
return res; %d-WQwJ
} (-1{W^(
NH5sV.vvc
void CCaptureDlg::AddIcon() t?^!OJ:L
{ vnf2Z,f%
NOTIFYICONDATA data; w"D1mI!L
7
data.cbSize=sizeof(NOTIFYICONDATA); WJ8osWdLu
CString tip; Ymnh%wS
tip.LoadString(IDS_ICONTIP); Qru&lAYc<
data.hIcon=GetIcon(0); 3XUVUd~
data.hWnd=GetSafeHwnd(); Xsn M}
strcpy(data.szTip,tip); ]ZR`
6|"VO
data.uCallbackMessage=IDM_SHELL; c#u_%*
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B(FM~TVZ
data.uID=98; <7T}b95
Shell_NotifyIcon(NIM_ADD,&data); ;9#W#/B
ShowWindow(SW_HIDE); "IpbR
bTray=TRUE; *E>R1bJ8
} g>7i2
"tOm
void CCaptureDlg::DeleteIcon() %Y/;jCY
{ bFG?mG:
NOTIFYICONDATA data; {[bpvK
data.cbSize=sizeof(NOTIFYICONDATA); pi70^`@ 'B
data.hWnd=GetSafeHwnd(); ,[N(XstI
data.uID=98; Q|VBH5}1O
Shell_NotifyIcon(NIM_DELETE,&data); fhdqes])
ShowWindow(SW_SHOW); st.{AEv@
SetForegroundWindow(); (-;(wCEE
ShowWindow(SW_SHOWNORMAL); L>Ze*dt
bTray=FALSE; "`S?q G
} toj5b;+4F
vG)B}`M
void CCaptureDlg::OnChange() ETH
($$M
{ y_Gs_xg
RegisterHotkey(); 2S:B%cj9m
} m'G=WO*%
mJ[_q>
BOOL CCaptureDlg::RegisterHotkey() @az<D7j2
{ $6ucz'
UpdateData(); EHl~y=9
UCHAR mask=0; 0.PG]K6
UCHAR key=0; 8Bc2?NI=
if(m_bControl) xHx_!
)7
mask|=4; [(3 %$?[
if(m_bAlt) 03 iy[~Y2
mask|=2;
@qWClr{`
if(m_bShift) ~ e<,GUx(]
mask|=1; V3|"
v4
key=Key_Table[m_Key.GetCurSel()]; 5&A' +]
if(bRegistered){ yI!W658$6
DeleteHotkey(GetSafeHwnd(),cKey,cMask); kE+fdr\ T
bRegistered=FALSE; [P6A$HC<
} cJSwA&
cMask=mask; .R4,fCN
cKey=key; TR
`C|TV>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Zu~t )W
return bRegistered; 2h}FotlO
} a~!7A
ZT-O
Mu.oqT
四、小结 9)[)07
.W9
*-
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。