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:
f3s4aARP
|QQ(1#d 一、实现方法
mR|']^!SE "*S_w N% 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:
mnw(x#%P $7-S\sDr #pragma data_seg("shareddata")
-
/cf3 HHOOK hHook =NULL; //钩子句柄
fp`m>}
- UINT nHookCount =0; //挂接的程序数目
n?S)H= static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
hpq\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
G @]n(\7Y static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'R#MH static int KeyCount =0;
]ki) (Bb static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
<e wcWr #pragma data_seg()
xa967Ki9" gt=@v()) 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
P,7R/-u 5D jF(R;?, DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
zQ+
%^DT1 p _2Y c]8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
6KE64: \; cKey,UCHAR cMask)
7f*b5$+r {
|o^mg9 BOOL bAdded=FALSE;
j'Gezx^.<e for(int index=0;index<MAX_KEY;index++){
&g=6K&a$a if(hCallWnd[index]==0){
tVNFulcz$ hCallWnd[index]=hWnd;
.x}xa HotKey[index]=cKey;
1suP7o A; HotKeyMask[index]=cMask;
Mp^G7JY, bAdded=TRUE;
kX*.BZI}C KeyCount++;
k9&W0$I# break;
.3>q3sS }
e:.D^GFi
}
WopA7J, return bAdded;
Q91mCP~$ }
9)n3f^,Oj* //删除热键
QVmJ_WT BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8hMy$ {
o*[[nK*fL BOOL bRemoved=FALSE;
Wd7qpWItjQ for(int index=0;index<MAX_KEY;index++){
X@/wsW(kM\ if(hCallWnd[index]==hWnd){
q9\(<<f| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:3b\ pEO9\ hCallWnd[index]=NULL;
]w]:9w HotKey[index]=0;
YllW2g: HotKeyMask[index]=0;
1M?Sl?+j bRemoved=TRUE;
gQeoCBCE KeyCount--;
#UvWS break;
j*~z.Q | }
2ppJ;P{k }
*8/cd0 }
l=a<=i return bRemoved;
hn$jI5*` }
YWDd[\4 II\}84U2
. ?9T,sX: DLL中的钩子函数如下:
R[#B|$ R$"> LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
KB{/L5 {
n8q%>.i7 BOOL bProcessed=FALSE;
Z5*O\kJv if(HC_ACTION==nCode)
[L
{
=A_{U(> if((lParam&0xc0000000)==0xc0000000){// 有键松开
7p{2&YhB switch(wParam)
KPZqPtb; {
VK|$SY( case VK_MENU:
LX(`@-<DH MaskBits&=~ALTBIT;
20M]gw] break;
cA{,2CYc case VK_CONTROL:
kZc Ge* MaskBits&=~CTRLBIT;
N0YJ'.=8, break;
awLSY:JI case VK_SHIFT:
" "CNw-^t MaskBits&=~SHIFTBIT;
u~Y+YzCxV break;
V9;IH<s: default: //judge the key and send message
Vp8!-[R break;
_1jeaV9@ }
K~qKr<) for(int index=0;index<MAX_KEY;index++){
w3Dqpo8E if(hCallWnd[index]==NULL)
0{stIgB$ continue;
g&/r =U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V|4k=_- {
Q.fD3g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+X>Aj=# bProcessed=TRUE;
HzZX=c }
WVx^}_FD0 }
&
5'cN }
ko~e*31_E else if((lParam&0xc000ffff)==1){ //有键按下
JNI&]3[C>? switch(wParam)
xfqU
atC {
zB6&),[,v case VK_MENU:
9"dZ4{\! MaskBits|=ALTBIT;
,!98VJmr break;
OV-#8RXJ case VK_CONTROL:
K48QkZ_gY MaskBits|=CTRLBIT;
h3p~\%^ break;
Fn;Gq-^7@ case VK_SHIFT:
W)`H(J MaskBits|=SHIFTBIT;
jVSU]LU E break;
h~#.s*0.F default: //judge the key and send message
FCChB7c` break;
f%%'M.is }
D)eRk0iC for(int index=0;index<MAX_KEY;index++){
#
tU@\H5kN if(hCallWnd[index]==NULL)
De49!{\a continue;
FuP~_ E~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
= Fwzm^}6 {
sv#/ 78 ~| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Lnl-han% bProcessed=TRUE;
{HP.HK }
G+NTn\ }
+4k4z:<n }
?T>N vKF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
s)9sbJ for(int index=0;index<MAX_KEY;index++){
:(4];Va if(hCallWnd[index]==NULL)
i6k~j%0m continue;
o H]FT{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.j`8E^7< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~0 L:c&V //lParam的意义可看MSDN中WM_KEYDOWN部分
02po; }
9}11>X }
6/|"y }
0"u=g)3 return CallNextHookEx( hHook, nCode, wParam, lParam );
-n6T^vf }
>yr3C .X6V>e)(3 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:
tBE-:hX* '>% c@C[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l
i2/"~l BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"IoY$!Hk p5bM/{DP;K 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:
z2SR/[I? _/F}y[B7d LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
liTAV9< {
R)9FXz$). if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
>V@,K z1 {
w%kaM= //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
%&4\'lE SaveBmp();
Xgo`XsA return FALSE;
}Q{4G }
*G,r:Bnb …… //其它处理及默认处理
o%v,6yv }
`Ro>?H |d_ rK2 l4q7,%G 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。
~#iAW@ w%f51Ex 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。
+9_E+H'?! }-paGM@'Nd 二、编程步骤
fq0[7Yb 13I~
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";
lziC.Dpa Mm#=d?YUHJ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
MZSyu ZHc;8|} 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;
7`K)7 9S)A6] 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;
:']O4v#^ E=~Ahkg 5、 添加代码,编译运行程序。
ZmJHLn[B |1Ko5z 三、程序代码
^Kh>La:>O BsN~Z!kd ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
uszMzO~ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,9/s`o #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
+F6R@@rWr #if _MSC_VER > 1000
A*3R@G*h #pragma once
8hvh
xp #endif // _MSC_VER > 1000
X[o"9O|< #ifndef __AFXWIN_H__
ps=QVX)YP #error include 'stdafx.h' before including this file for PCH
g?!;04 #endif
7>|p_o`e #include "resource.h" // main symbols
C,3yu,' class CHookApp : public CWinApp
u9dL-Nr` {
JPS<e*5 public:
vX}mwK8
CHookApp();
}i2dXC/ // Overrides
WFpR@53Db // ClassWizard generated virtual function overrides
ktK/s!bgY //{{AFX_VIRTUAL(CHookApp)
0d=<^wLi^ public:
v:@ud,d< virtual BOOL InitInstance();
gPWl# 5P: virtual int ExitInstance();
Vq#_/23=$y //}}AFX_VIRTUAL
{X>U`0P //{{AFX_MSG(CHookApp)
F6#U31Q= // NOTE - the ClassWizard will add and remove member functions here.
"_/5{Nc$ // DO NOT EDIT what you see in these blocks of generated code !
hdee]qLS //}}AFX_MSG
vghn+P8 DECLARE_MESSAGE_MAP()
w^QqYUL${ };
dLTA21b# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
\)9R1zp/x BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&SK=ZOKg^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
CI,xp
BOOL InitHotkey();
Q*AgFF%wn BOOL UnInit();
T 9?!.o #endif
VEg/x z4c @5(HRd //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
_k.gVm #include "stdafx.h"
6 0Obek` #include "hook.h"
YiPp#0T[Gx #include <windowsx.h>
J*O$)K%Hx #ifdef _DEBUG
1Du9N[2'P #define new DEBUG_NEW
b1qli5 #undef THIS_FILE
jRIm_) static char THIS_FILE[] = __FILE__;
>@U
lhJtW #endif
4WV)&50 #define MAX_KEY 100
) XHcrm& #define CTRLBIT 0x04
_i{4 4zE #define ALTBIT 0x02
VR0#" #define SHIFTBIT 0x01
quw:4W> #pragma data_seg("shareddata")
Li\BRlebR{ HHOOK hHook =NULL;
1_.#'U> UINT nHookCount =0;
MOW {g\{\ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
wH[}@ w static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Sf0[^"7 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
:7Q,
`W9 static int KeyCount =0;
|qsY0zx static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
o] 7U;W #pragma data_seg()
R!LKGiN HINSTANCE hins;
ss>?fyA void VerifyWindow();
uP[:P?,t BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
XD\Z$\UJE //{{AFX_MSG_MAP(CHookApp)
CDM==Xa* // NOTE - the ClassWizard will add and remove mapping macros here.
\M`fkR,,' // DO NOT EDIT what you see in these blocks of generated code!
@3b|jJyf //}}AFX_MSG_MAP
>qI|g={M END_MESSAGE_MAP()
I3V>VLv %S<( z5 CHookApp::CHookApp()
DY%#E9 {
c F(]`49( // TODO: add construction code here,
JP<Z3
A2q // Place all significant initialization in InitInstance
~0>{PD$@ }
<=,KP) >h
m<$3 CHookApp theApp;
1"CbuV
6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%U)M?UNjw {
i@ avm7 BOOL bProcessed=FALSE;
L~FE;*>7 if(HC_ACTION==nCode)
g#ONtY@*U {
F-n1J?4b if((lParam&0xc0000000)==0xc0000000){// Key up
9jwo f}OU switch(wParam)
H;n(qBSB {
S[ ,r.+ case VK_MENU:
C&'Y@GE5 MaskBits&=~ALTBIT;
{XNu4d9w( break;
8Cr?0Z case VK_CONTROL:
q}["Nww- MaskBits&=~CTRLBIT;
jTx,5s- break;
[Pt5c6 L: case VK_SHIFT:
Dk fw*Oo MaskBits&=~SHIFTBIT;
TY|]""3f9 break;
1xo<V5 default: //judge the key and send message
prY9SQd break;
]X)EO49 }
^$y_~z3o#7 for(int index=0;index<MAX_KEY;index++){
BE}qwP^ if(hCallWnd[index]==NULL)
lA<IcW continue;
W$Bx?}x($ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P( W8XC {
o;JBe"1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
I
-obfyije bProcessed=TRUE;
jjm-%W@ }
m H'jr$ ? }
STmCj }
+:[dviyPt else if((lParam&0xc000ffff)==1){ //Key down
ca_8S8lv switch(wParam)
UmU=3et<Wj {
y*6r&989 case VK_MENU:
:L FwJ MaskBits|=ALTBIT;
|C S[>0mV! break;
<u"#Jw/VP case VK_CONTROL:
yREO;m|o MaskBits|=CTRLBIT;
n6nwda break;
c"J(? 1O case VK_SHIFT:
%;PPu$8K9 MaskBits|=SHIFTBIT;
W3K"5E0ck break;
YAZ=-@]`\ default: //judge the key and send message
bct&ge7YX break;
[M2,bc8SJV }
p$@=N6)I.k for(int index=0;index<MAX_KEY;index++)
6#5@d^a {
\o@b5z]e if(hCallWnd[index]==NULL)
9ffRY,1@ continue;
nx,67u/Pb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
DRVvW6s {
v4|kiy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
bah5 f bProcessed=TRUE;
Pwz^{*u] }
j&Ayk* }
i4!n Oyk }
(s{%XB:K if(!bProcessed){
Af0E_ for(int index=0;index<MAX_KEY;index++){
a@,tf'Sr if(hCallWnd[index]==NULL)
Zk}e?Grc continue;
?#D@e5Wf if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Z#;ieI\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$X~=M_W }
=W ! m` }
+.\JYH=yEr }
v-[|7Pg}Z return CallNextHookEx( hHook, nCode, wParam, lParam );
OG 5n9sx }
rf1nC$Sop ;Xgy2'3 BOOL InitHotkey()
QbqLj>-AJ {
:N)7SYQT if(hHook!=NULL){
Zml9ndzT nHookCount++;
Ed*`d> return TRUE;
[dU/;Sk5 }
`Xmpm4 ] else
O t`}eL- hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
T:.J9 if(hHook!=NULL)
3[aJ=5 nHookCount++;
i$:CGUb return (hHook!=NULL);
5'V'~Q% }
r?/>t1Z BOOL UnInit()
HNjkRl)QR {
T*h+"TmE if(nHookCount>1){
>cMU<'& nHookCount--;
S^D ~A8u return TRUE;
p7H*Ff` }
>Q5E0 !] BOOL unhooked = UnhookWindowsHookEx(hHook);
^ad>
(W if(unhooked==TRUE){
!b _<_Y{l nHookCount=0;
s[s 6E`Q hHook=NULL;
D|-]"(2i }
1<59)RiO> return unhooked;
o~>p=5t }
8@+YcN;-> "?qu(}| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5-mJj&0:! {
'T|.<u@~ BOOL bAdded=FALSE;
XcfTE
m for(int index=0;index<MAX_KEY;index++){
l]v
*h0! if(hCallWnd[index]==0){
sCRBKCR? hCallWnd[index]=hWnd;
`(o1& HotKey[index]=cKey;
dnIBAe HotKeyMask[index]=cMask;
g\*gHHa bAdded=TRUE;
&*)tqQeQf KeyCount++;
BTd'bD~EA break;
Q}fAAZ&7h }
q}\\p }
GF/p|I D return bAdded;
\v-> ' }
zRE7 w: Z p__ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
acGmRP9g {
E!Fy2h>[Z BOOL bRemoved=FALSE;
0|^x[dh for(int index=0;index<MAX_KEY;index++){
m/ 6oQ if(hCallWnd[index]==hWnd){
BxZop.zwE( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
vCpi|a_eCu hCallWnd[index]=NULL;
am"/Anml| HotKey[index]=0;
*10e)rzM HotKeyMask[index]=0;
uqO51V~ bRemoved=TRUE;
J0=`n(48B KeyCount--;
HWefuj break;
M $~h(3 }
f1~3y}7^Jq }
iPFYG }
BEI/OGp return bRemoved;
#JLDj(a? }
SpkVV/ %ri4nKGS void VerifyWindow()
BklB3*n {
E$ngmm[ for(int i=0;i<MAX_KEY;i++){
g3Xz- if(hCallWnd
!=NULL){ /p%K[)T(
if(!IsWindow(hCallWnd)){ ~hxB Pn."
hCallWnd=NULL; rf`Br\g8
HotKey=0; !<YRocQY
HotKeyMask=0; BO9Z"|"
KeyCount--; Zi[)(agAT
} mJsYY,b8
} Iiy:<c
} ynDx'Q* N'
} ,F-tvSc\Q
pz$$K?
BOOL CHookApp::InitInstance() NqwVsVL
{ [{ { ?e6J
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3,F/i+@
hins=AfxGetInstanceHandle(); mm{U5
InitHotkey(); ,jt098W
return CWinApp::InitInstance(); TAAsV#l
} eLC&f}
<#s-hQ
int CHookApp::ExitInstance() O?2<rbx
{ n7MS{`
VerifyWindow(); c'|MC[^A
UnInit(); MV/~Rmd.
return CWinApp::ExitInstance(); xLD6A5n,[
} "yz\p,
6Ss{+MF|v
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4vX]c
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9Y 4N
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ffxk] o&%c
#if _MSC_VER > 1000 k0YsAa#6V
#pragma once ~o%-\^oc
#endif // _MSC_VER > 1000 N{`l?t0I
G4{qWa/
class CCaptureDlg : public CDialog 2?r8>#_*
{ r2](~&i2
// Construction a:|4q
public: aEk*-v#{
BOOL bTray; 7IHD?pnZ
BOOL bRegistered; GY",AL8f
BOOL RegisterHotkey(); kIfb!
UCHAR cKey; \G= E%aK
UCHAR cMask; dI 5sqM:
void DeleteIcon(); N*SgP@Bt
void AddIcon(); /SUV'J)
UINT nCount; nM; G;
T
void SaveBmp(); 28)TXRr-
CCaptureDlg(CWnd* pParent = NULL); // standard constructor b"Mq7&cf
// Dialog Data #VOjnc/rW
//{{AFX_DATA(CCaptureDlg) z8j(SI;3
enum { IDD = IDD_CAPTURE_DIALOG }; qE`=^
CComboBox m_Key; rqFs[1wr>R
BOOL m_bControl; #pe{:f?
BOOL m_bAlt; mWusRgj+8
BOOL m_bShift; OhW=F2OIV
CString m_Path; 8@fDn(]w
CString m_Number; O9|'8"AF
//}}AFX_DATA epR~Rlw>2
// ClassWizard generated virtual function overrides )PG,K4z
//{{AFX_VIRTUAL(CCaptureDlg) L@z !,r,
public: r;XQ i
virtual BOOL PreTranslateMessage(MSG* pMsg); NI1HUUZz
protected: &V?q d{39
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ij#a
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1 :Yt2]
//}}AFX_VIRTUAL !1RV[b.8
// Implementation p\{+l;`
protected: X]yERaJ,i
HICON m_hIcon; lz)"zV
// Generated message map functions g&Z7h4!\
//{{AFX_MSG(CCaptureDlg) zkp
Apj].
virtual BOOL OnInitDialog(); V{h@nhq
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;/V@N |$n
afx_msg void OnPaint(); ~^^ey17
afx_msg HCURSOR OnQueryDragIcon(); [\b_+s)eN
virtual void OnCancel(); /SXz_e
afx_msg void OnAbout(); qp W#!Vbx
afx_msg void OnBrowse(); 2ZO'X9
afx_msg void OnChange(); [)3 U])w/
//}}AFX_MSG B
(1,Rq[
DECLARE_MESSAGE_MAP() <]'"e]
}; @g75T` N
#endif 0H3T'J%r
Q@2tT&eL
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _=L;`~=C9e
#include "stdafx.h" \u]CD}/
#include "Capture.h" lkfFAwnc
#include "CaptureDlg.h" k,7+=.6
#include <windowsx.h> r}\h\ {
#pragma comment(lib,"hook.lib")
Is@a,k
#ifdef _DEBUG ~B&*7Q7
#define new DEBUG_NEW pIu H*4Vz
#undef THIS_FILE uit-Q5@~
static char THIS_FILE[] = __FILE__; UNQRtR/
#endif 4*vas]
#define IDM_SHELL WM_USER+1 s1vrzze
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v\Y}(fD
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TJXraQK-=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <KwK
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class CAboutDlg : public CDialog Uk:.2%S2
{ cU*lB!
public: H\I!J@6g
CAboutDlg(); <8)s
// Dialog Data F36ViN\b
//{{AFX_DATA(CAboutDlg) yb{Q, Dz
enum { IDD = IDD_ABOUTBOX }; =$8@JF'
//}}AFX_DATA [S]!+YBK
// ClassWizard generated virtual function overrides d=Do@)
m|
//{{AFX_VIRTUAL(CAboutDlg) cIr1"5POXK
protected: c,q"}nE8w
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0sd-s~;
//}}AFX_VIRTUAL +V9B
// Implementation ^
6.lb\
protected: *kQCW#y0
//{{AFX_MSG(CAboutDlg) ~B!O~nvdQ
//}}AFX_MSG z9 w&uZzi
DECLARE_MESSAGE_MAP() ~u0xXfv#
}; A,gx5!J
.NkAD-k`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) cH;TnuX
{ D4q>R;
//{{AFX_DATA_INIT(CAboutDlg) YvruK:I
//}}AFX_DATA_INIT `OP>(bU0
} lB!vF ~A&
6B''9V:s
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PDIclIMS'F
{ 5ttMua <G?
CDialog::DoDataExchange(pDX); 4C1FPrh
//{{AFX_DATA_MAP(CAboutDlg) k=7Gr;;l=p
//}}AFX_DATA_MAP C,r`I/;
} h4anr7g{
EF=dXm/\
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7"q+"0G
//{{AFX_MSG_MAP(CAboutDlg) Q0cY/'>4
// No message handlers x48'1&m
//}}AFX_MSG_MAP 7B(bH8
END_MESSAGE_MAP() tKZ&1E
`\jTpDV_W
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h.V]f S
: CDialog(CCaptureDlg::IDD, pParent) YN@6}B#1
{ NLQE"\#a
//{{AFX_DATA_INIT(CCaptureDlg) 'e]HP-Y<
m_bControl = FALSE; @ EmGexLPM
m_bAlt = FALSE; d9Z&qdxTKq
m_bShift = FALSE; _(6`{PWY
m_Path = _T("c:\\"); "#twY|wW
m_Number = _T("0 picture captured."); Cqgk
nCount=0; #+"4&:my
bRegistered=FALSE; 85D^@{
bTray=FALSE; q[G/}
//}}AFX_DATA_INIT #%^\\|'z
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =4zNo3IvL+
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -@2'I++"@
} A)Qh
Kej|1g1f
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y}LLOj@L
{ ~XUOW Y75
CDialog::DoDataExchange(pDX); 0||"r&:X
//{{AFX_DATA_MAP(CCaptureDlg)
4;C*Fa
DDX_Control(pDX, IDC_KEY, m_Key); $_C+4[R?
DDX_Check(pDX, IDC_CONTROL, m_bControl); _1sMY hI
DDX_Check(pDX, IDC_ALT, m_bAlt); L)F1NuR
DDX_Check(pDX, IDC_SHIFT, m_bShift); 'j,oIqx
DDX_Text(pDX, IDC_PATH, m_Path); +2DE/wE]e+
DDX_Text(pDX, IDC_NUMBER, m_Number); BWUt{,?KU
//}}AFX_DATA_MAP yI8m%g%
} o\ngR\>
py{eX`(MS
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VLsh=v
//{{AFX_MSG_MAP(CCaptureDlg) XDk'2ycv
ON_WM_SYSCOMMAND() H&X:!xa5
ON_WM_PAINT() AJyq>0p
ON_WM_QUERYDRAGICON() aDL)|>"Q
ON_BN_CLICKED(ID_ABOUT, OnAbout) :N@U[Wx0A
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %bP~wl~
ON_BN_CLICKED(ID_CHANGE, OnChange) `c"4PU^
//}}AFX_MSG_MAP $n= O
END_MESSAGE_MAP() fcRj
p jKt:R}
BOOL CCaptureDlg::OnInitDialog() mG)8U{L
{ b~_B
[cf
CDialog::OnInitDialog(); 4:vTxNs&S
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z)lM2x>|*
ASSERT(IDM_ABOUTBOX < 0xF000); XFW5AP
CMenu* pSysMenu = GetSystemMenu(FALSE); 4'SaEsA~
if (pSysMenu != NULL) FY]pv6@
{ 5YiZ-CQ>
CString strAboutMenu; [p ii
strAboutMenu.LoadString(IDS_ABOUTBOX); 2sKG(^=Z
if (!strAboutMenu.IsEmpty()) .^i<xY
{ +UxI{,L
pSysMenu->AppendMenu(MF_SEPARATOR); {A|bBg1!
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =fl%8"%N&
} SLkuT`*
} sVu k
SetIcon(m_hIcon, TRUE); // Set big icon 1SW4Y
SetIcon(m_hIcon, FALSE); // Set small icon |q;Al
z{
m_Key.SetCurSel(0); rA,CQypo
RegisterHotkey(); Xv0F:1
CMenu* pMenu=GetSystemMenu(FALSE); K@HQrv<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \a\= gn
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); JO2xT#V
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `=79i$,,t
return TRUE; // return TRUE unless you set the focus to a control -!cIesK;<
} !!FR[NK
9\v.qo.
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9x=3W?K:,
{ S'o ]=&
if ((nID & 0xFFF0) == IDM_ABOUTBOX) .Y1bY :=
{ 2FGx _Y
CAboutDlg dlgAbout; $uCiXDKCq
dlgAbout.DoModal(); XaW4C-D&
} tBseqS3<
else a/~29gW8E\
{
="\*h(
CDialog::OnSysCommand(nID, lParam); W;q+, Io
} CtM'L
} w
NH9WG
gN?0m4[$i
void CCaptureDlg::OnPaint() lEHwZ<je
{ /xySwSmh3
if (IsIconic()) 3 > |uF
{ -Q$b7*"z(
CPaintDC dc(this); // device context for painting -#aZF2z
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'M8aW!~
// Center icon in client rectangle Wr5 Q5s)c
int cxIcon = GetSystemMetrics(SM_CXICON); hK(tPl$
int cyIcon = GetSystemMetrics(SM_CYICON); x=-0 zV
CRect rect; =EW3&+Lt
GetClientRect(&rect); vX+.e1m
int x = (rect.Width() - cxIcon + 1) / 2; 5`~mqqR5
int y = (rect.Height() - cyIcon + 1) / 2; ?E<c[*F05
// Draw the icon QH~Jy*\+PX
dc.DrawIcon(x, y, m_hIcon); G>%AZr{M
} ?*H9-2W@
else @9 )}cg
{ mb\h^cKaq
CDialog::OnPaint(); txq~+'A:+
} G2]^F Y
} L/?]^!.
3OP.12^
HCURSOR CCaptureDlg::OnQueryDragIcon() p0M=t-
{ o.Oq__ >$H
return (HCURSOR) m_hIcon; Nb;H`<JP
} 3]/.\(2
h*Je35
void CCaptureDlg::OnCancel() tPU-1by$
{ bLbR IY"l
if(bTray) 6tn+m54_
DeleteIcon(); sTkkM9
CDialog::OnCancel(); /L&M,OUcr.
} cy|%sf`
SfW}"#L>5
void CCaptureDlg::OnAbout() /r^[a,Q#x
{ /v#)f-N%zs
CAboutDlg dlg; b,@aqu
dlg.DoModal(); I@\+l6&#;
} /0lC KU!=
S~)w\(r
void CCaptureDlg::OnBrowse() gnLn7?
{ -(#-I$z
CString str; 81F,Y)x.
BROWSEINFO bi; lY'N4x7n
char name[MAX_PATH]; $^_|j1z#i
ZeroMemory(&bi,sizeof(BROWSEINFO)); p|qyTeg
bi.hwndOwner=GetSafeHwnd(); ;YyXT"6/p
bi.pszDisplayName=name; -M4p\6)Ge
bi.lpszTitle="Select folder"; ``|AgIg
bi.ulFlags=BIF_RETURNONLYFSDIRS; 6/tI8H3E
LPITEMIDLIST idl=SHBrowseForFolder(&bi); SfB8!V|;
if(idl==NULL) m"d/b~q
return; i]o"_=C
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); W7=V{}b+
str.ReleaseBuffer(); 2YOKM#N]
m_Path=str; s_ bR]G
if(str.GetAt(str.GetLength()-1)!='\\') dqc1q:k?$
m_Path+="\\"; gR Nv-^
UpdateData(FALSE); *:hyY!x
} mfom=-q3k
Dl C@fZD
void CCaptureDlg::SaveBmp() ".U^ifF
{ riCV&0"n
CDC dc; Br5o7(AE
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,^$|R32
CBitmap bm; ,gx)w^WTm
int Width=GetSystemMetrics(SM_CXSCREEN); 3[IJhR[
int Height=GetSystemMetrics(SM_CYSCREEN); #0"~G][#
bm.CreateCompatibleBitmap(&dc,Width,Height); +(?>-3_z
CDC tdc; U \oy8FZ
tdc.CreateCompatibleDC(&dc); kV&9`c+
CBitmap*pOld=tdc.SelectObject(&bm); aeP[+ I9
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cpZc9;@IC
tdc.SelectObject(pOld); S%mfs!E>
BITMAP btm; Ug%_@t/?
bm.GetBitmap(&btm); jQh^WmN
DWORD size=btm.bmWidthBytes*btm.bmHeight; 5[gh|I;D
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !EBY@ Y1
BITMAPINFOHEADER bih; 0Scm?l3
bih.biBitCount=btm.bmBitsPixel; \9{F5Sz
bih.biClrImportant=0; 6GL=)0Ah
bih.biClrUsed=0; T!2=*~A
bih.biCompression=0; jqnCA<G~B-
bih.biHeight=btm.bmHeight; D'_Bz8H!p
bih.biPlanes=1; h|;qG)f^
bih.biSize=sizeof(BITMAPINFOHEADER); C~4PE>YtTv
bih.biSizeImage=size; %.HJK
bih.biWidth=btm.bmWidth; zsXpA0~3s
bih.biXPelsPerMeter=0;
..W-76{
bih.biYPelsPerMeter=0; s9)8b$t]
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); LM)`CELsYc
static int filecount=0; f{&bOF v
CString name; ?GT@puJS-
name.Format("pict%04d.bmp",filecount++); @T-p2#&
name=m_Path+name; `>lzlEhKV
BITMAPFILEHEADER bfh; ,0N94pKy
bfh.bfReserved1=bfh.bfReserved2=0; +T{'V^
bfh.bfType=((WORD)('M'<< 8)|'B'); #{J,kcxS
bfh.bfSize=54+size; 5|8^9Oe5
bfh.bfOffBits=54; sLL7]m}
CFile bf; If-_?wZe
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T7*wS#z)h
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !#yq@2QX
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &1|?BZv
bf.WriteHuge(lpData,size); O(Jj|Z
bf.Close(); "3CJUr:Q
nCount++; (bp9Pj w
} D=r))
GlobalFreePtr(lpData); Iah[j,]r
if(nCount==1) tt_o$D~kg
m_Number.Format("%d picture captured.",nCount); 9N8I
ip]w
else M8&}j
m_Number.Format("%d pictures captured.",nCount); MCTsi:V>+
UpdateData(FALSE); \nqkA{;B{
} p0:kz l4$
DKL@wr}8
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]0V}D,V($
{ 'jg3
if(pMsg -> message == WM_KEYDOWN) U7@AC}.+
{ v Gy8Qu>
if(pMsg -> wParam == VK_ESCAPE) i[jJafAcN
return TRUE; XXZaKgsq
if(pMsg -> wParam == VK_RETURN) U(>4s]O6
return TRUE; <Zb/
} H}}$V7]^),
return CDialog::PreTranslateMessage(pMsg); *e>]~Z,
} 7[#yu 2
_qwQ;!9
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;,h/
{ Kv&g5&N,
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~uWOdm-"[
SaveBmp(); pKUP2m`MW
return FALSE; bUwn}_7b
} hZXXBp
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ SLL3v,P(7
CMenu pop; /1UOT\8U
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \Q?ip&R
CMenu*pMenu=pop.GetSubMenu(0); rqPo)AL
pMenu->SetDefaultItem(ID_EXITICON); d*8 $>GA
CPoint pt; `r"+644
GetCursorPos(&pt); JuR"J1MY
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o G*5f
if(id==ID_EXITICON) G3P&{.v
DeleteIcon(); /6uT6G+(z}
else if(id==ID_EXIT) "I6P=]|b
OnCancel(); /*FH:T<V
return FALSE; uA tV".
} d[^KL;b?6
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6RO(]5wX
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) C$h<Wt=<
AddIcon(); yOU(2"8p
return res; 2jJmE&)7,
} s9;#!7ms
6 gL=u-2
void CCaptureDlg::AddIcon() Rk<@?(l!6x
{ E51dV:l
NOTIFYICONDATA data; }_/Hdmmx
data.cbSize=sizeof(NOTIFYICONDATA); q%n6K
CString tip; gN8hJG'0
tip.LoadString(IDS_ICONTIP); $,=6[T!z+e
data.hIcon=GetIcon(0); AN:sQX`
data.hWnd=GetSafeHwnd(); !%+2Yifna
strcpy(data.szTip,tip); jd]s<C3o
data.uCallbackMessage=IDM_SHELL; "xI"
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; aimarU
data.uID=98; qU2~fNY
Shell_NotifyIcon(NIM_ADD,&data); k %e^kej
ShowWindow(SW_HIDE); <P[T!gST
bTray=TRUE; bK"SKV
} i$G;f^Z!Y
(
9!k#
void CCaptureDlg::DeleteIcon() H`bSYjgM!
{ K%<j=c
NOTIFYICONDATA data; :NHH
Dl
data.cbSize=sizeof(NOTIFYICONDATA); xJ^>pg8
data.hWnd=GetSafeHwnd(); G@FI0\t
data.uID=98; oBQ#eW aY
Shell_NotifyIcon(NIM_DELETE,&data); p^<yj0Y
ShowWindow(SW_SHOW); fqX"Lus `=
SetForegroundWindow(); y.5/?{GL
ShowWindow(SW_SHOWNORMAL); }VS3L_
;}/
bTray=FALSE; oF9
-&
} s4Sd>D7
KH)D08
void CCaptureDlg::OnChange() oVA?J%EK
{ N7'OPTKt&
RegisterHotkey(); Ds#/
} 1wzqGmjmt
E#J';tUQ
BOOL CCaptureDlg::RegisterHotkey() Wt)Drv{@ {
{ ;AR{@Fu.
UpdateData(); #/"8F O%~p
UCHAR mask=0; WV3|?,y]qm
UCHAR key=0; F|Mi{5G%
if(m_bControl) ZUz ^!d
mask|=4; 2XTPBZNe
if(m_bAlt) bmN q[}
mask|=2; 7{e{9QbJ4
if(m_bShift) H gTUy[(
mask|=1; 3!Sp0P
key=Key_Table[m_Key.GetCurSel()]; :q8b;*:
if(bRegistered){ 3czeTj
DeleteHotkey(GetSafeHwnd(),cKey,cMask); [U}+sTQ
bRegistered=FALSE; [Vd[-
} S)QAXjH
cMask=mask; ;Op3?_
cKey=key; +4[^!q*
H
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); s2?T5oWU
return bRegistered; Q~R
~xz
} Q9I
j\HbA"
WLF0US'
四、小结 p
raaY}}
}I3gU
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。