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:
AOx3QgC^NO
{dA
~#fW< 一、实现方法
_#D\*0J LL[#b2CKa 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:
EY&C[= C$td{tM #pragma data_seg("shareddata")
7;}3{z HHOOK hHook =NULL; //钩子句柄
#G+ UINT nHookCount =0; //挂接的程序数目
V"by9p|V` static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
TflS@Z7C static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
z2Y_L8u2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
W+f&%En static int KeyCount =0;
h @,e`Z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-V
u/TT0 #pragma data_seg()
vMX6Bg8 dHq )vs,L 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
ow+Dd[i EdAR<VfleA DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
A]iv)C;] -j`!(IJ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Wbn[Q2h5 cKey,UCHAR cMask)
Q P=[ Vw {
y+"; BOOL bAdded=FALSE;
Qyv'nx0= for(int index=0;index<MAX_KEY;index++){
!jnqA Z if(hCallWnd[index]==0){
8gbm "! hCallWnd[index]=hWnd;
B3>Uba*-)} HotKey[index]=cKey;
t&9as} HotKeyMask[index]=cMask;
RCh$j&Tn bAdded=TRUE;
%g0z)J KeyCount++;
#x5 N{8 break;
mfngbFa1 }
|J<pLz }
~1=.?Ho return bAdded;
?z@v3(b[ }
wyrI8UY //删除热键
-Y8ks7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rO(TG {
{yHB2=nI BOOL bRemoved=FALSE;
gR;8ht(pd( for(int index=0;index<MAX_KEY;index++){
" _:iK] if(hCallWnd[index]==hWnd){
+%
XhQ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
,_Qe}qFU hCallWnd[index]=NULL;
l$-=Pqb HotKey[index]=0;
xxoHH#a HotKeyMask[index]=0;
"y~muE:. bRemoved=TRUE;
UbY~xs7_ KeyCount--;
ii_|)udz break;
:m*!?QGdL }
QtnM(m }
5%QC
][, }
4+5OR&kxZ return bRemoved;
hJ;f1dZ7} }
oEenm\ZI Txt%nzIu )l#%.Z9 DLL中的钩子函数如下:
aYaG]&hb
#a(%(k S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
M<A;IOpR+ {
#h gmUa BOOL bProcessed=FALSE;
=!?[]>Dh if(HC_ACTION==nCode)
L}}=yh6r {
29a_ZU7e6 if((lParam&0xc0000000)==0xc0000000){// 有键松开
hJw
|@V switch(wParam)
YN%=Oq {
<.r ]dCf case VK_MENU:
qe5tcv}u MaskBits&=~ALTBIT;
K0O-WJ break;
`Di ^6UK( case VK_CONTROL:
Lp:Nw4 _ MaskBits&=~CTRLBIT;
?iPZsV break;
/nC{)s?S' case VK_SHIFT:
E!zd( MaskBits&=~SHIFTBIT;
%\}dbYS
' break;
( zn_8s default: //judge the key and send message
0" U5oP[ break;
"UQr :/ }
),cQUB for(int index=0;index<MAX_KEY;index++){
oLrkOn/aY if(hCallWnd[index]==NULL)
xFBh? continue;
?G$Om if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
iK5]y+@8 {
+{,N X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Vs_\ykO bProcessed=TRUE;
cWN d<=Jp }
MzEm*`< }
je&dioZ> }
;cv.f>Cm else if((lParam&0xc000ffff)==1){ //有键按下
R'Kt=.s< switch(wParam)
k$e D(cW$ {
81GQijq case VK_MENU:
+1otn~(E MaskBits|=ALTBIT;
w^06z, break;
\%sPNw=e case VK_CONTROL:
&Ki>h MaskBits|=CTRLBIT;
j 0g5<M break;
J[e} case VK_SHIFT:
PD6MyW05%9 MaskBits|=SHIFTBIT;
; cGv] A+ break;
U9 1 &| default: //judge the key and send message
k2EHco0BG break;
B#FHf
Z }
9#v-2QY for(int index=0;index<MAX_KEY;index++){
f ,tW_g if(hCallWnd[index]==NULL)
\hs/D+MCk continue;
ppAmN0=G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oR*ztM
{
$ q%mu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w Y8@1>ah bProcessed=TRUE;
a?5WKO }
uQH%.A }
}x*7l`1 }
=WIE>*3[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
WMW1B}Z3 for(int index=0;index<MAX_KEY;index++){
J'oDOn.M if(hCallWnd[index]==NULL)
(C,e6r Y continue;
U(U@!G) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&Fw[YGJayz SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`TUZZz //lParam的意义可看MSDN中WM_KEYDOWN部分
T>d\%*Q+B }
C">`' G2 }
3(1]FKZtt }
b6 $,Xh return CallNextHookEx( hHook, nCode, wParam, lParam );
h S4.3]ei }
dZPW2yf x>}B# 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
EJ1Bq>u7 ARP KzF`Wq BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
7$!yfMttu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z8IPhE@ ^;.T}c%N 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:
e"]"F{Q ful#Px6m LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Sa L"!uAk {
b3}Q#Y\G if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
}*NF&PD5RU {
5?Bc
Y; //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1j11|~ SaveBmp();
grr'd+_ e return FALSE;
WP}ixcq# }
:pRF*^eU …… //其它处理及默认处理
tE@FvZC'= }
R,%_deV\( @<2d8ed -LTKpN`[@ 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。
k}GjD2m cph~4wCS[U 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。
t-WjL@$F/ KF_ ?'X0= 二、编程步骤
_K'7(d0z Jy]Id*u9 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";
$xT1 1 ^ s.VA!@F5 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Ea-bC:>
[>f]@> 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;
WfZF~$li` Vo\H<_=G 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;
b._m 8z ~ %t*[T 5、 添加代码,编译运行程序。
YGp)Oy}: PnA?+u2m 三、程序代码
-p`L%xj\ JEhm1T ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
yoQ\lk #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
~EEs}i #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
IxOc':/jY #if _MSC_VER > 1000
hd2'AlB #pragma once
^
q?1U?4 #endif // _MSC_VER > 1000
^/toz).Q #ifndef __AFXWIN_H__
UX2lPgKdLz #error include 'stdafx.h' before including this file for PCH
hJf2o #endif
E=AVrv5T #include "resource.h" // main symbols
dY!u)M;~~ class CHookApp : public CWinApp
'N\&<dT> {
E)W@{?.o# public:
>zs5s CHookApp();
jAC78n,Fi@ // Overrides
d]SYP // ClassWizard generated virtual function overrides
(?>cn_m //{{AFX_VIRTUAL(CHookApp)
KxIyc7. public:
M&KyA virtual BOOL InitInstance();
+Rwx%= virtual int ExitInstance();
wfR&li{ //}}AFX_VIRTUAL
[|RjHGf //{{AFX_MSG(CHookApp)
)K;]y-Us[ // NOTE - the ClassWizard will add and remove member functions here.
kccWoU, // DO NOT EDIT what you see in these blocks of generated code !
irKIy //}}AFX_MSG
k_ Y~;P@ DECLARE_MESSAGE_MAP()
FJ54S };
MzkkcQLK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
XN;&qR^j BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
BMFF= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
dU_;2#3m BOOL InitHotkey();
S_b/DO BOOL UnInit();
Xj@+{uvQB #endif
^A9M;q p=Y>i 'CG //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
.tnkT;T #include "stdafx.h"
;a
r><w #include "hook.h"
y9 L14 #include <windowsx.h>
%w
) +V #ifdef _DEBUG
O=}g4c #define new DEBUG_NEW
g`0moXz #undef THIS_FILE
n lGHT static char THIS_FILE[] = __FILE__;
3^,QIG #endif
iPj~I #define MAX_KEY 100
!yJICjXj #define CTRLBIT 0x04
wRvb8F0 #define ALTBIT 0x02
)d`mvZBn1 #define SHIFTBIT 0x01
Da.G4,vLh #pragma data_seg("shareddata")
+v7) 1y HHOOK hHook =NULL;
[
MyE2^ UINT nHookCount =0;
!wE}(0BTx static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Z7a945Jd static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
BPv>$
m+. static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
cn`iX(ZgR static int KeyCount =0;
!%)]56( static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
!*{q^IO9v& #pragma data_seg()
}m-"8\_D HINSTANCE hins;
IG ~`i I void VerifyWindow();
-_N)E ))G BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
;9a 6pz< //{{AFX_MSG_MAP(CHookApp)
`]i
[]| // NOTE - the ClassWizard will add and remove mapping macros here.
i=S~(gp // DO NOT EDIT what you see in these blocks of generated code!
vB0RKk}d5 //}}AFX_MSG_MAP
L] %l51U END_MESSAGE_MAP()
`3 cCH uLR<FpM CHookApp::CHookApp()
vB'>[jvA| {
l'[A?%L%{ // TODO: add construction code here,
pG3k // Place all significant initialization in InitInstance
Cu;5RSr2Z }
;i<jhNA ";SiL{Z CHookApp theApp;
]?+{aS-]?k LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
(s<s@` {
;C.S3} BOOL bProcessed=FALSE;
i^msjA if(HC_ACTION==nCode)
M@et6aud;K {
L%"LlSg if((lParam&0xc0000000)==0xc0000000){// Key up
r6Aneg7 switch(wParam)
Vvp[P> {
iUi>y.}"P case VK_MENU:
nh+l78 MaskBits&=~ALTBIT;
Z4b|| break;
4?\:{1X= case VK_CONTROL:
49H+(*@v@ MaskBits&=~CTRLBIT;
!69&Ld break;
WKfkKk;G case VK_SHIFT:
&7e)O= MaskBits&=~SHIFTBIT;
ULJ mSe break;
o 5U(i default: //judge the key and send message
X}ma] break;
$sHP\{ }
)!:sFa
1 for(int index=0;index<MAX_KEY;index++){
c2nKPEX&5 if(hCallWnd[index]==NULL)
]`g@UtD9` continue;
&ANP`= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n2B){~vE {
')Y'c SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
tBbOY}.VD bProcessed=TRUE;
yw-8#y }
'a6<ixgo0 }
O^Q7b7}y }
nI.x else if((lParam&0xc000ffff)==1){ //Key down
:Qt switch(wParam)
Q4*?1`IsR {
ElhRF{R case VK_MENU:
/D&%v*~E MaskBits|=ALTBIT;
{76c%<`WaP break;
Rhc-q|Lz8 case VK_CONTROL:
#DU26nCL MaskBits|=CTRLBIT;
TfYVw~p_ % break;
soA|wk\A case VK_SHIFT:
)Z 9E=% MaskBits|=SHIFTBIT;
8Me:Yp_Xt break;
PXzsj. default: //judge the key and send message
*a;@* break;
%
2$/JZ }
P262Q&.}d for(int index=0;index<MAX_KEY;index++)
H,fZ!8(A_) {
)L{ghy if(hCallWnd[index]==NULL)
}/tf>?c continue;
#'D"
'B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
eV:9y {
C?v[Z]t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
xw^R@H bProcessed=TRUE;
zi R5:d3 }
#6Fez`A }
RqEH|EUZ }
,mhQ"\ +C if(!bProcessed){
R'EUV0KX>Y for(int index=0;index<MAX_KEY;index++){
LEMfG~Czq if(hCallWnd[index]==NULL)
VVH.2&`I continue;
Unj.f>U if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
00v&lQBW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]^':Bmq }
F'jWV5"* }
]H-S,lmV }
%~L>1ShtU return CallNextHookEx( hHook, nCode, wParam, lParam );
gb
^?l~SS }
M FTkqbc J;_}lF9d@ BOOL InitHotkey()
'o|30LzYgQ {
k.("3R6v: if(hHook!=NULL){
.+7;)K
nHookCount++;
S5~VD?O, return TRUE;
- p3Re9 }
}bY;q- else
x~xa6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
eP*lI<NQ1 if(hHook!=NULL)
&%})wZ+Dj nHookCount++;
m'P1BLk return (hHook!=NULL);
J)P$2# }
/VmR<C?h BOOL UnInit()
R\o<7g-| {
yFDv6yJ. if(nHookCount>1){
2gO2jJlv nHookCount--;
MZ Aij return TRUE;
R|O8RlH }
HGm 3+, BOOL unhooked = UnhookWindowsHookEx(hHook);
6qcO?U if(unhooked==TRUE){
9Gv[8'I nHookCount=0;
'YNT8w/3 hHook=NULL;
^Wxad?@ }
GKN%Tv:D_ return unhooked;
GpZc5c }
WVVJ j'9"cE5_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
i4^o59}8 {
#fT*]NN BOOL bAdded=FALSE;
m[j70jYe for(int index=0;index<MAX_KEY;index++){
LPMU8Er if(hCallWnd[index]==0){
J[f;Xlh hCallWnd[index]=hWnd;
(`y*V;o4 HotKey[index]=cKey;
626Z5Afg HotKeyMask[index]=cMask;
^Z~;4il_F bAdded=TRUE;
;&1V0U,fx KeyCount++;
1V8-^ break;
{?'fyEeg }
R|wGU)KEc' }
_.L4e^N&UO return bAdded;
<n]x#0p }
D9j3Xu %Gt.m BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J,Ks0MA {
=[F<7pvE BOOL bRemoved=FALSE;
d&Ef"H for(int index=0;index<MAX_KEY;index++){
(SKVuR%Jj if(hCallWnd[index]==hWnd){
aN"DkUYZM if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/yM:|`tT hCallWnd[index]=NULL;
m1Y>Nj[f HotKey[index]=0;
a4irokJv# HotKeyMask[index]=0;
R
{-5Etv bRemoved=TRUE;
BJ% eZ. KeyCount--;
!
u:Weoz break;
qUly\b 47 }
e^.Fa59 }
`Od5Gh }
&hRvol\J return bRemoved;
xO-+i\ ZV }
K)J(./ =JJL[}a| void VerifyWindow()
liXdNk8 {
wE~V]bmtW for(int i=0;i<MAX_KEY;i++){
;qrB\j" if(hCallWnd
!=NULL){ Dk?\)lD`
if(!IsWindow(hCallWnd)){ 4'0Dr++
hCallWnd=NULL; HuOIFv
HotKey=0; 66fO7OJs
HotKeyMask=0; ~8lwe*lNV
KeyCount--; r/SG 4
} _-EyT
} r#XT3qp$d
} ?M[ A7?
} ;VWAf;U;B
$sEy%-
BOOL CHookApp::InitInstance() 'Fmvu
{ St e=&^
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y.*y9)#S6
hins=AfxGetInstanceHandle(); /iX+ R@
InitHotkey(); {?yr'*
return CWinApp::InitInstance(); Hla0 5N' 4
} V,$0p1?J
]Ux<aiY]a
int CHookApp::ExitInstance() 5H ue7'LS
{ 8 XU1/i7N
VerifyWindow(); 1Z9qjV%^
UnInit(); >yULC|'F&~
return CWinApp::ExitInstance(); Z,=7Tu bR#
} Y 'ow
B[KJR?>
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file aoXb2 2]{
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B'fb^n<
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,lyb!k8
#if _MSC_VER > 1000 }`@728E
#pragma once a[ex[TRKe
#endif // _MSC_VER > 1000 M8tRjNWS?
m@^1JlH
class CCaptureDlg : public CDialog DCZ\6WY1G)
{ +(h\fm7*-
// Construction rYbpih=x
public: ({q?d[q[
BOOL bTray;
6q{HU]N+
BOOL bRegistered; Bro9YP4<
BOOL RegisterHotkey(); B&@?*^.
UCHAR cKey; oZAB _A)[-
UCHAR cMask; <TP=oq?I/
void DeleteIcon(); l6d$V9A
void AddIcon(); wYmM"60
UINT nCount; /AW=5Ck- #
void SaveBmp(); l?Ya"C`FL
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z-l=\ekJ
// Dialog Data 8|" XSN
//{{AFX_DATA(CCaptureDlg) ;A*`e$
enum { IDD = IDD_CAPTURE_DIALOG }; :3I@(k\PY
CComboBox m_Key; #Y4=J
6
BOOL m_bControl; 1~PV[2a
BOOL m_bAlt; :$n=$C-wp
BOOL m_bShift; #E&80#Z5
CString m_Path; {j7uv"|X7
CString m_Number; ^pYxKU_O
//}}AFX_DATA *m#Za<_Gv
// ClassWizard generated virtual function overrides yrlf+tl
//{{AFX_VIRTUAL(CCaptureDlg) Y 1t\iU
public: Wr( y)D<y}
virtual BOOL PreTranslateMessage(MSG* pMsg); =17t-
[
protected: D}mjN=Y
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *"{lMZ+
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C<P%CG&;
//}}AFX_VIRTUAL r.BIJt)
// Implementation eN^qG
42
protected: M#8uv-L
HICON m_hIcon; ;S>])5<
// Generated message map functions (Kv#m
3~
//{{AFX_MSG(CCaptureDlg) m8o(J\]
virtual BOOL OnInitDialog(); 7eiV{ tYF
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %;rHrDP(>
afx_msg void OnPaint(); *#C+iAF|)'
afx_msg HCURSOR OnQueryDragIcon(); lk( }-
virtual void OnCancel(); v~^{{O
afx_msg void OnAbout(); $GTU$4u
afx_msg void OnBrowse(); Zd')57{
afx_msg void OnChange(); ;t|Ii8Ne
//}}AFX_MSG ^G.B+dG@`x
DECLARE_MESSAGE_MAP() apu4DAy&8
}; /%;mqrdk
#endif hX=A)73(
d&+h}O
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yp({>{u7
#include "stdafx.h" ?]}8o}G
#include "Capture.h" FN8NTBk
#include "CaptureDlg.h" [_Qa9e
#include <windowsx.h> @]ytla>d
#pragma comment(lib,"hook.lib") =_:et0
#ifdef _DEBUG =Xqc]5[i
#define new DEBUG_NEW IyWI5Q"t
#undef THIS_FILE tV{4"Ij9[
static char THIS_FILE[] = __FILE__; Y4v|ko`l%
#endif OR;uqV@
#define IDM_SHELL WM_USER+1 o}* hY"&
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MpF$xzh
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;JayoJ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; FgB&b
class CAboutDlg : public CDialog l=v4Fa0^jF
{ ~4 `5tb
public: U15H@h
CAboutDlg(); uLWh|
// Dialog Data E( Z8
//{{AFX_DATA(CAboutDlg) mD^jd+
enum { IDD = IDD_ABOUTBOX }; D?NbW @]
//}}AFX_DATA #6CC3TJ'k
// ClassWizard generated virtual function overrides /N&CaH\;^$
//{{AFX_VIRTUAL(CAboutDlg) a+%6B_|\
protected: /JWGifH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ybY]e; v*O
//}}AFX_VIRTUAL pP*a
// Implementation $d_|NssvU
protected: ;n&t>pBM
//{{AFX_MSG(CAboutDlg) lc~%=
//}}AFX_MSG d2H|LMhJ
DECLARE_MESSAGE_MAP() T Kg aV;92
}; rV T{90,
,uSQNre\j
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -@0GcUE:r
{ x3o]U)^
//{{AFX_DATA_INIT(CAboutDlg) N _86t
//}}AFX_DATA_INIT w tiny,6
} i:OK8Q{VI
6jC`8l:
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Bg|5KOnd
{ Aj+2;]M
CDialog::DoDataExchange(pDX); V 7Ek-2M
//{{AFX_DATA_MAP(CAboutDlg) iqe%=%ZR
//}}AFX_DATA_MAP V4KMOYqm
} V0P>YQq9s
cT!\{~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5Hw~2 ?a,
//{{AFX_MSG_MAP(CAboutDlg) v5QqS8u_C
// No message handlers 2AO~HxF
//}}AFX_MSG_MAP JYW)uJ
END_MESSAGE_MAP() .K p
>8qQK r\"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @CZT
: CDialog(CCaptureDlg::IDD, pParent) 7r~~Y%=C|
{ Lcg)UcB-#
//{{AFX_DATA_INIT(CCaptureDlg) -T[lx\}
m_bControl = FALSE; [YUv7|\
m_bAlt = FALSE; J
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m_bShift = FALSE; 0a-0Y&lQm
m_Path = _T("c:\\"); y"H*%]
m_Number = _T("0 picture captured."); /Z@tv.f
nCount=0; UHTvCc
bRegistered=FALSE; *fn*h[pV&
bTray=FALSE; W8KDX_vGJ
//}}AFX_DATA_INIT 4<lRPsvgc
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Wb?8j M
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [Z}9>~m
} b"vv>Q~U
V;:j ZpG
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P8*=Ls+-F
{
l%1!a
CDialog::DoDataExchange(pDX); aD=A^ktx
//{{AFX_DATA_MAP(CCaptureDlg) SU/BQ3
DDX_Control(pDX, IDC_KEY, m_Key); *rIk:FehLB
DDX_Check(pDX, IDC_CONTROL, m_bControl); ;3B1_vo9
DDX_Check(pDX, IDC_ALT, m_bAlt); NqDHCI
DDX_Check(pDX, IDC_SHIFT, m_bShift); .U?'i<
DDX_Text(pDX, IDC_PATH, m_Path); OslL~<
DDX_Text(pDX, IDC_NUMBER, m_Number); JU^lyi!
//}}AFX_DATA_MAP ]Zyur`
} dAkgR~
RIY,K*f.
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) enSXP~9w
//{{AFX_MSG_MAP(CCaptureDlg) Z(ACc9k6:'
ON_WM_SYSCOMMAND() zhpt%7So
ON_WM_PAINT() Cif>7]M
ON_WM_QUERYDRAGICON() LYaZ1*
ON_BN_CLICKED(ID_ABOUT, OnAbout) /oR<A
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %0,#ADCqOe
ON_BN_CLICKED(ID_CHANGE, OnChange) R}4So1
//}}AFX_MSG_MAP 2IKnhBSV3
END_MESSAGE_MAP() d+Ek%_
T^~5n6
BOOL CCaptureDlg::OnInitDialog() JAQb{KefdO
{ "6us#T
CDialog::OnInitDialog(); 9+{G8$Ai
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S=e{MI
ASSERT(IDM_ABOUTBOX < 0xF000); uoX:^'q
CMenu* pSysMenu = GetSystemMenu(FALSE); EB2!Hp uQ3
if (pSysMenu != NULL) -wSg2'b4E
{ YYu6W@m]
CString strAboutMenu; :qIXY/
strAboutMenu.LoadString(IDS_ABOUTBOX); RkBb$q9F]
if (!strAboutMenu.IsEmpty()) 3P^sM1
{ 'F$l{iR
pSysMenu->AppendMenu(MF_SEPARATOR); PEuIWXr
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7,lq}a8z
} .[3Z1v,
} zY('t!u8
SetIcon(m_hIcon, TRUE); // Set big icon
WqXbI4;pJ
SetIcon(m_hIcon, FALSE); // Set small icon @]-jl}:]
m_Key.SetCurSel(0); /eOzXCSws
RegisterHotkey(); Ct=-4
CMenu* pMenu=GetSystemMenu(FALSE); 4bw4cqY;
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); VI'hb'2
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ),ma_{$N
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,kF}lo)
return TRUE; // return TRUE unless you set the focus to a control
1][S#H/?
} Gr^E+#;
hnc@
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0^RXGN
{ zBk'{[y9L
if ((nID & 0xFFF0) == IDM_ABOUTBOX) %Cv D-![0
{ !`M|C?b
CAboutDlg dlgAbout; ` M3w]qJ<}
dlgAbout.DoModal(); P)MDPI+~
} (KF=On;=Y
else v4.#;F.\m
{ oWC@w
CDialog::OnSysCommand(nID, lParam); D(H>R&b!
} h?;T7|^
} TG+VEL |T
Ndcg/d
void CCaptureDlg::OnPaint() :X]itTrGs
{ kMt 8/ E`
if (IsIconic()) < VSA
{ jhg;%+KB
CPaintDC dc(this); // device context for painting ?)1{)Erf8x
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); GP:77)b5
// Center icon in client rectangle R5 9S@MsuD
int cxIcon = GetSystemMetrics(SM_CXICON); UM6(s@$
int cyIcon = GetSystemMetrics(SM_CYICON); s8#X3Rp
CRect rect; *UmI]E{g3(
GetClientRect(&rect); J_v$YwE
int x = (rect.Width() - cxIcon + 1) / 2; FWHNj.r
int y = (rect.Height() - cyIcon + 1) / 2; WUsKnf
// Draw the icon 371
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dc.DrawIcon(x, y, m_hIcon); HO}Hh[{V9
} 2g>SHS@1>
else ~(IB0=A{v
{ i2&ed_h<?
CDialog::OnPaint(); _cJ2\`M
} -cSP_1
} (;57 Vw
*]VFvh
HCURSOR CCaptureDlg::OnQueryDragIcon()
GrAujc5|
{ pn.T~"%
return (HCURSOR) m_hIcon; `/ q|@B7
} ,J{ei7TN
x>* Drm 7
void CCaptureDlg::OnCancel() v!ujj5-$I
{ yz LpK;
if(bTray) JMz;BAHT
DeleteIcon(); ^,;z|f'%*
CDialog::OnCancel(); 9J>&29@us0
} - qy6Un+
PUBWZ^63
void CCaptureDlg::OnAbout() -!N&OZ+R
{ 0Emr<n
CAboutDlg dlg; q"<ac qK
dlg.DoModal(); r.>].~}4
} kLni{IYN7
0;:.B
j
void CCaptureDlg::OnBrowse() Wr3mQU
{ [I$BmGQ
CString str; u*tN)f3
BROWSEINFO bi; :SGF45>B@
char name[MAX_PATH]; 9lW;Nk*j:
ZeroMemory(&bi,sizeof(BROWSEINFO)); Yl#Rib
bi.hwndOwner=GetSafeHwnd(); krC{ed
bi.pszDisplayName=name; Mc%Nf$XQ
bi.lpszTitle="Select folder"; =|%Cu&
bi.ulFlags=BIF_RETURNONLYFSDIRS; dUF&."pW e
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;r>snJ=M
if(idl==NULL) MV\|e1B}
return; CFqJ/''
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `>?ra-
str.ReleaseBuffer(); w -
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m_Path=str; lI-L`
x
if(str.GetAt(str.GetLength()-1)!='\\') 9v}G{mQ#
m_Path+="\\";
2;^y4ssg
UpdateData(FALSE); t0nI ('LX,
} H*Kj3NgY
-t2+|J*
void CCaptureDlg::SaveBmp() yfx7{naKC`
{ 8ZKo_I\
CDC dc; ewfP G,S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); F^5?\
CBitmap bm; +H9 >A0JF
int Width=GetSystemMetrics(SM_CXSCREEN); &%s8L\?
int Height=GetSystemMetrics(SM_CYSCREEN); &p}$J)q
bm.CreateCompatibleBitmap(&dc,Width,Height); zD(`B+
CDC tdc; 5o6>T!
tdc.CreateCompatibleDC(&dc); ( @3\`\X
CBitmap*pOld=tdc.SelectObject(&bm); n[]tXrhU
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q"t<3-"
tdc.SelectObject(pOld); z j/!In
BITMAP btm; ~5 *5
bm.GetBitmap(&btm); XP1~d>j
DWORD size=btm.bmWidthBytes*btm.bmHeight; #SX8=f`K5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rN%F)
q#
BITMAPINFOHEADER bih; s.x&LG
bih.biBitCount=btm.bmBitsPixel; Oer^Rk
bih.biClrImportant=0; Q^q1ns;r
bih.biClrUsed=0; h~(D@/tB
bih.biCompression=0; e+j)~RBnu3
bih.biHeight=btm.bmHeight; u&9 r2R959
bih.biPlanes=1; :OkT? (i
bih.biSize=sizeof(BITMAPINFOHEADER); v$7EvFS
bih.biSizeImage=size; svuq gSn
bih.biWidth=btm.bmWidth; pFm=y#!t
bih.biXPelsPerMeter=0; jU3Z*Z)zN
bih.biYPelsPerMeter=0; KMV=%o
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2Y>~k{AN%
static int filecount=0; $YXMI",tt<
CString name; kdCP
name.Format("pict%04d.bmp",filecount++);
(:";i&
name=m_Path+name; `KCh*i
BITMAPFILEHEADER bfh; Da v PYg
bfh.bfReserved1=bfh.bfReserved2=0; d5>H3D{49
bfh.bfType=((WORD)('M'<< 8)|'B'); &E40*
(C
bfh.bfSize=54+size; 8> .J1C
bfh.bfOffBits=54; ? B E6
CFile bf; gi-Yqco
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =r.mlc``W
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }->.k/vc
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A)~X,
bf.WriteHuge(lpData,size); E!Zx#XP1
bf.Close(); p?2Y }9
nCount++; i:cXwQG}B
} Pf$pt
GlobalFreePtr(lpData); e+]6OV&+
if(nCount==1) m "M("%
m_Number.Format("%d picture captured.",nCount); ncX/L[L
else <d<mvXbw_@
m_Number.Format("%d pictures captured.",nCount); "
beQZG
UpdateData(FALSE); +R\vgE68
} sT/c_^y
u1~9{"P*
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Khe!g1=&X
{ iajX ~kv
if(pMsg -> message == WM_KEYDOWN) L3p`
{ 78Aa|AJU
if(pMsg -> wParam == VK_ESCAPE) UDc$"a}ds{
return TRUE; e.*%K!(
if(pMsg -> wParam == VK_RETURN) )$&dg2[
return TRUE; if)Y9:{r^
} k` {@pt.
return CDialog::PreTranslateMessage(pMsg); X/;p-KX
} NB7Y{)
w
.,i(2^
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *1'`"D~
{ >F@qpjoQE
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ooj~&fu
SaveBmp(); mCz,2K|^~
return FALSE; H Y ynMP
} g'l?~s`SB
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DS2)@
CMenu pop;
/q@s
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;oxAe<VIj
CMenu*pMenu=pop.GetSubMenu(0); Xwa_3Xm*Le
pMenu->SetDefaultItem(ID_EXITICON); om3`[r[{
CPoint pt; }%-t+Tf,
GetCursorPos(&pt); ;@nFVy>U
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]O`
{dnP
if(id==ID_EXITICON) {&[9iIf
DeleteIcon(); j.i#*tN//
else if(id==ID_EXIT) 3^StIw{X
OnCancel(); $3d}"D
return FALSE; PU {uE[
} 1
Vy,&[c~"
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &5%dhc4&!&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) c DrebU
AddIcon(); 2T)sXB u
return res; ya
-i^i\
} *<'M!iRC
o]LRzI
void CCaptureDlg::AddIcon() /EMJSr
{ 1mSaS4!"B
NOTIFYICONDATA data; O3N_\B:
data.cbSize=sizeof(NOTIFYICONDATA); C*X
G_b ]
CString tip; 0fs$#j
tip.LoadString(IDS_ICONTIP); >qo~d?+
data.hIcon=GetIcon(0); 7yt=]1
data.hWnd=GetSafeHwnd(); m7%C#+67
strcpy(data.szTip,tip); d"U(`E=H9
data.uCallbackMessage=IDM_SHELL; #g5^SR|qE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; o\`>c:.
data.uID=98; +zkm(
Shell_NotifyIcon(NIM_ADD,&data); gr-x|wK
ShowWindow(SW_HIDE); y\F=ui
bTray=TRUE; =6=_/q2
} %5
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void CCaptureDlg::DeleteIcon() *zWWmxcJa
{ 4.K'\S
NOTIFYICONDATA data; U,lJ"$'
data.cbSize=sizeof(NOTIFYICONDATA); >J=<bhR
data.hWnd=GetSafeHwnd(); 1#
t6`N]?V
data.uID=98; -Z^4L
Shell_NotifyIcon(NIM_DELETE,&data); CkRX>)=py
ShowWindow(SW_SHOW); zQH]s?v
SetForegroundWindow(); t/Z:)4Z
ShowWindow(SW_SHOWNORMAL); p8+/\Ee]B
bTray=FALSE; "%@uO)A /
} pl V7+?G
\;]kYO}
void CCaptureDlg::OnChange() N8!TZ~1$
{ ]]cYLaq(
RegisterHotkey(); eeUp 1g
} \m@Y WO?L
HhkN^S,
BOOL CCaptureDlg::RegisterHotkey() D6Y6^eS-
{ {BO|u{C
UpdateData(); W3Ulewa
UCHAR mask=0; b>~RSO*
UCHAR key=0; XNH4==4
if(m_bControl) >!9h6BoGV
mask|=4; ;t]|15]u
if(m_bAlt) ?A7Yk4Y.?N
mask|=2; ^GYq#q9Q
if(m_bShift) TRKgBK$,
mask|=1; %HSl)zEo>C
key=Key_Table[m_Key.GetCurSel()]; u{bL-a8}
if(bRegistered){ L"rcv:QWZa
DeleteHotkey(GetSafeHwnd(),cKey,cMask); C%ytkzG_
bRegistered=FALSE; 5@XV6
} S;A)C`X&
cMask=mask; mjEs5XCC"
cKey=key; vv
7+>%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K@@9:T$
return bRegistered; >Wh3MG6
} y67uH4&Vm
ggou*;'
四、小结 !%mi&ak(Rn
A1*4*
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。