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:
K&zW+C b
u!&T}i: 一、实现方法
~Uey'Xz ijUu{PG`X 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:
tTF<DD}8 <h;_: #pragma data_seg("shareddata")
`<g6^ P HHOOK hHook =NULL; //钩子句柄
rS+) )! UINT nHookCount =0; //挂接的程序数目
{M7`"+~w static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
.6LRg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
5ba e- static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>MSK.SNh static int KeyCount =0;
>*opE I+ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Qc)i?Z'6 #pragma data_seg()
(wu ciKQ p*)I QM<B 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。
c~O
Lr TUz4-Pd 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:
Tl'wA^~H r>7+&s*yk BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
^y qRa& cKey,UCHAR cMask)
dJ/gc"7aO {
/-i m
g^^ BOOL bAdded=FALSE;
\uZ|2WG` for(int index=0;index<MAX_KEY;index++){
8|<</v8i if(hCallWnd[index]==0){
=[&+R9s hCallWnd[index]=hWnd;
6)*B%$?x HotKey[index]=cKey;
_ E-\aS{ HotKeyMask[index]=cMask;
=.&8ghJ*M bAdded=TRUE;
K*{RGE KeyCount++;
I>JE\## ^n break;
rsLkH&aM }
PH%'^YAl7 }
MG~Z)+g=y return bAdded;
Rd5-ao4 }
EI7n|X
a1q //删除热键
[3s-S+n
@ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GlTpK^. {
Kw$@_~BJ6 BOOL bRemoved=FALSE;
~]QQaP for(int index=0;index<MAX_KEY;index++){
f6yj\qq] if(hCallWnd[index]==hWnd){
cm_5,wB(w if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&P>& T hCallWnd[index]=NULL;
`/`iLso&- HotKey[index]=0;
aL*MC gb' HotKeyMask[index]=0;
^<-)rzTI bRemoved=TRUE;
%OB>FY:| KeyCount--;
IW&*3I<K break;
0ju-l=w }
>
Xh=P% }
jex\5 }
!=PH5jTY return bRemoved;
@TD=or .& }
O39 s~2o<# 7<*0fy5n n DLL中的钩子函数如下:
_z8"r& LAo$AiTUR{ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[Z"Z5e` {
/*{'p!? BOOL bProcessed=FALSE;
ib#rT{e if(HC_ACTION==nCode)
}e/vKWfT {
`4snTM!v& if((lParam&0xc0000000)==0xc0000000){// 有键松开
2>o^@4PnZ switch(wParam)
nDO7 {
K-)!d$$
case VK_MENU:
D_0sXIbg MaskBits&=~ALTBIT;
ybqmPT'|_ break;
o$l8"Uv case VK_CONTROL:
=0]K(p, MaskBits&=~CTRLBIT;
y6tqemz break;
nOd;Zw case VK_SHIFT:
XHj%U MaskBits&=~SHIFTBIT;
JbL3/h] break;
Dy,MQIM|! default: //judge the key and send message
8s2y!pn7Q break;
YTZ :D/ }
]&"ii for(int index=0;index<MAX_KEY;index++){
1fMV$T==K if(hCallWnd[index]==NULL)
xvl{o continue;
>6jal?4u- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V^R,j1* {
" "m-5PGYo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
)Z1&`rv bProcessed=TRUE;
9aLd!PuTN }
_AX,}9 }
3N-
'{c6]U }
}T(=tfv@ else if((lParam&0xc000ffff)==1){ //有键按下
~!~i_L\V switch(wParam)
%(p9AE {
`ovMfL.u case VK_MENU:
KJ32L MaskBits|=ALTBIT;
l7jen=(Zb; break;
tc[Ld# case VK_CONTROL:
H`fJ<So? MaskBits|=CTRLBIT;
}|2A6^FH. break;
PN?;\k)" case VK_SHIFT:
9x!kvB6 MaskBits|=SHIFTBIT;
YW6a?f^! break;
21tv(x default: //judge the key and send message
J&fIWZ break;
4-SU\_ }
E56 for(int index=0;index<MAX_KEY;index++){
6'kQ(r> if(hCallWnd[index]==NULL)
%q3`k#?< continue;
ut\X{.r7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B !,&{[D
{
No6-i{HZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
XP
o#qT8n bProcessed=TRUE;
LEPTL#WT1 }
H=,>-eVv* }
aReJ@ }
2^
]^Yc if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
yc?L
OW0 for(int index=0;index<MAX_KEY;index++){
#J3o~,t< if(hCallWnd[index]==NULL)
\P+^BG! continue;
-*KKrte if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$%\6"P/64 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
qMVuFwPhi //lParam的意义可看MSDN中WM_KEYDOWN部分
!;(Wm6~*ad }
h[iO'Vq }
iYvzZ7
8f }
"*D9.LyM return CallNextHookEx( hHook, nCode, wParam, lParam );
{+_p?8X }
g$#A'Du ~mt{j7 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:
48^C+#Jbc Vf~-v$YI BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
O.X;w<F/V BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
;@ixrj0u rZpsC}C' 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
],0I`!\ dR.?Kv(,E LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
LKc p.i {
;f[##=tm if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
3Fn}nek {
ejyx[CF //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
9q$^x/z! SaveBmp();
I*Dj@f` return FALSE;
z-kv{y*Hu
}
s<# BxN …… //其它处理及默认处理
h7fytO }
<a$!S N}%AUm/L *j]Bo,AC 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
zn^7#$fC 7L&,Na 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。
0]*W0#{Zj [<U=)!Swg 二、编程步骤
y
`FZ 0FI Q njK<}M9 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";
^j${#Q j0+D99{R 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
e#k rr ]zyT_}& 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
AN:s%w2 "IQYy~
/ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
>SvS(N{ mMl len 5、 添加代码,编译运行程序。
.wq
j (nmsw6
X 三、程序代码
goyDG/ D=z="p\ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
]!sCWR #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
6?%$e$s #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
HLqN=vE6 #if _MSC_VER > 1000
+,YK}?e #pragma once
NY<qoV #endif // _MSC_VER > 1000
hy;V~J# #ifndef __AFXWIN_H__
am3.Dt2\ #error include 'stdafx.h' before including this file for PCH
h>*3i# #endif
G)[gLD{g? #include "resource.h" // main symbols
xLFMC?I class CHookApp : public CWinApp
K]B`&ih {
!ck~4~J public:
D:j5/ * CHookApp();
. G25D // Overrides
w=!xTA // ClassWizard generated virtual function overrides
m?yztm~u //{{AFX_VIRTUAL(CHookApp)
!:5'MI@ public:
w@R" g%k- virtual BOOL InitInstance();
9#1?Pt^{< virtual int ExitInstance();
s 7wA3|9 //}}AFX_VIRTUAL
h@*I(ND< //{{AFX_MSG(CHookApp)
~a2|W|? // NOTE - the ClassWizard will add and remove member functions here.
{aV,h@> // DO NOT EDIT what you see in these blocks of generated code !
>6&Rytcc] //}}AFX_MSG
$Bc3| `K1v DECLARE_MESSAGE_MAP()
V >eG\ };
> O?<? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
.YvIVQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5655)u.N8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
XX90Is BOOL InitHotkey();
q]pHD})O BOOL UnInit();
@|"K"j# #endif
zi`q([ >r(`4M: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
_i7yyt;h #include "stdafx.h"
ji4bz#/B0 #include "hook.h"
DAf@-~c #include <windowsx.h>
Q.jThP`p #ifdef _DEBUG
&$2d=q8mh #define new DEBUG_NEW
zmD7]?| #undef THIS_FILE
OY81|N
j static char THIS_FILE[] = __FILE__;
Y=Ic<WHR #endif
^fO9oPM| #define MAX_KEY 100
KwaxNb5 #define CTRLBIT 0x04
T zS?WYF #define ALTBIT 0x02
}BT0dKx #define SHIFTBIT 0x01
0/|Ax-dK #pragma data_seg("shareddata")
sl@>GbnS HHOOK hHook =NULL;
qhTVsZ:{C UINT nHookCount =0;
XABP}|aWK static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
TYR \K static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
wBw(T1VN static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Iy;"ht6 static int KeyCount =0;
4Ng:7C2 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
jHE^d<=O^ #pragma data_seg()
z#`Qfvu6Hi HINSTANCE hins;
B>cT<B void VerifyWindow();
l+&DBw[ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Zw{?^6;cS //{{AFX_MSG_MAP(CHookApp)
GNuIcy // NOTE - the ClassWizard will add and remove mapping macros here.
~;]zEq-hG // DO NOT EDIT what you see in these blocks of generated code!
TUwX4X6m //}}AFX_MSG_MAP
x)eF{%QB END_MESSAGE_MAP()
=a+
} 6 2/A*\ CHookApp::CHookApp()
H{i|?a) {
=~W=} // TODO: add construction code here,
pZ*%zt]-a // Place all significant initialization in InitInstance
h:G>w`X }
>L "+8N6 nTtEv~a_n CHookApp theApp;
:EYUBtTj LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
jK[*_V {
'`<Fys&: BOOL bProcessed=FALSE;
#1*7eANfr if(HC_ACTION==nCode)
4bw4!z9G {
nJYIkfdA if((lParam&0xc0000000)==0xc0000000){// Key up
IaOR%Bg switch(wParam)
EBL-+%J8 {
^ZS!1%1 case VK_MENU:
@x!+_z MaskBits&=~ALTBIT;
0k5 uqGLXe break;
k$f2i,7' case VK_CONTROL:
4:**d[|1 MaskBits&=~CTRLBIT;
+hispU3ia break;
OXKV6r6f case VK_SHIFT:
%;u"2L0@ MaskBits&=~SHIFTBIT;
>/ A'G break;
W?kJ+1"( default: //judge the key and send message
m`$Q/SyvG break;
)/Eu=+d }
:HrFbq for(int index=0;index<MAX_KEY;index++){
&\cS{35 if(hCallWnd[index]==NULL)
/joY? T continue;
!kb:g]X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bd%<
Jg+ {
I7=A!C" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
@VG@|BQWa bProcessed=TRUE;
E>5p7=Or;" }
2cIbX }
1\aTA, }
dXM8iP else if((lParam&0xc000ffff)==1){ //Key down
1/;E8{ switch(wParam)
;34p
[RT {
;P;c!}:\b case VK_MENU:
:qB|~"9O MaskBits|=ALTBIT;
R6;#+ 1D break;
?GhMGpdMq case VK_CONTROL:
?D)$OCS MaskBits|=CTRLBIT;
Dyo^O=0c break;
E6O!e<ze^ case VK_SHIFT:
O8"
t.W MaskBits|=SHIFTBIT;
o%;ly break;
GBpdj}2= default: //judge the key and send message
n=$ne2/ break;
*ej< 0I{ }
KDGrX[L:6 for(int index=0;index<MAX_KEY;index++)
+|X`cmnuU {
J}8p}8eF, if(hCallWnd[index]==NULL)
O(=9&PRi continue;
o_k)x3I? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r1vS~
4Z {
|nLq4. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Rmn{Vui9\ bProcessed=TRUE;
r7?nHF }
j%bC9UkE3 }
|7A}LA }
Rcw[`q3/ if(!bProcessed){
~QPTs1Vk8 for(int index=0;index<MAX_KEY;index++){
[Y, L=p if(hCallWnd[index]==NULL)
vV9vB3K5? continue;
9c,/490Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=23@"ji@D SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%3t;[$n# }
xHaz*w1| }
/2/aMF(J }
M&faa7 return CallNextHookEx( hHook, nCode, wParam, lParam );
QT%vrXzz }
OA\]|2 : a.?U$F BOOL InitHotkey()
~Sm6{L {
>35w"a7S if(hHook!=NULL){
_$D!"z7i nHookCount++;
h.ftl2> return TRUE;
qAbmQ{|w }
fXl2i]L(^B else
C%]qK(9vvd hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
I"lzOD; eI if(hHook!=NULL)
aTeW#:m nHookCount++;
@0t[7Nv-1 return (hHook!=NULL);
X?< L<:. }
Qyx~={.C~ BOOL UnInit()
@b^$h:H {
lic-68T if(nHookCount>1){
HOPy&Fp nHookCount--;
x@bqPZ t return TRUE;
r[;d.3jtP }
X;)/<:mX BOOL unhooked = UnhookWindowsHookEx(hHook);
yx4pQL7 if(unhooked==TRUE){
qS!N\p~> nHookCount=0;
Pz:,de~5Qm hHook=NULL;
9Sd?,z }
G![4K#~NM return unhooked;
m$v >r\*X }
\>lA2^Ef yOKzw~;0% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zP2X}VLMo {
zYY]+)k? BOOL bAdded=FALSE;
5 *YvgB; for(int index=0;index<MAX_KEY;index++){
EleJ$ `/ if(hCallWnd[index]==0){
M
| "'`zc hCallWnd[index]=hWnd;
q6nRk~ HotKey[index]=cKey;
1%N*GJlwJ HotKeyMask[index]=cMask;
P\6:euI bAdded=TRUE;
a9{NAyl<oo KeyCount++;
V!^0E.?a break;
."B{U_P& }
&<uLr
*+* }
2;
,8 u return bAdded;
&}2@pu[S?7 }
X~"p]V_ c6c@XdV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o}/|"(K {
VR&dy|5BO BOOL bRemoved=FALSE;
&V<f;PF(I for(int index=0;index<MAX_KEY;index++){
3rMJC\h if(hCallWnd[index]==hWnd){
Kn@#5MC
rU if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2=8PA/ hCallWnd[index]=NULL;
Q25VG5G HotKey[index]=0;
u)o-H!a HotKeyMask[index]=0;
KZZ Y9 bRemoved=TRUE;
lA/-fUA KeyCount--;
vBF9!6X . break;
e_KfnPY
}
M_ %-A }
Khc^q*|C) }
L;j++^p return bRemoved;
G&1bhi52 }
)qbkKCq/FB ~v pIy - void VerifyWindow()
(Ll'j0]k> {
@,k5T51m for(int i=0;i<MAX_KEY;i++){
b$#b+G{y if(hCallWnd
!=NULL){ we^'R}d
if(!IsWindow(hCallWnd)){ AL3iNkEa
hCallWnd=NULL; "zd_eC5
HotKey=0; 0!lWxS0#=
HotKeyMask=0; a <?~1pWtc
KeyCount--; &b5(Su
} 0^o/cSF
} jED.0,+K!
} ;e5PoLc
} T~Bj],k_
u4SL:IH{D
BOOL CHookApp::InitInstance() EUcD[Rv
{ BPt? 3tC
AFX_MANAGE_STATE(AfxGetStaticModuleState()); -mRgB"8
hins=AfxGetInstanceHandle(); ^w~B]*A:"
InitHotkey(); H~Vf;k>
return CWinApp::InitInstance(); !f52JQyh
} 2 Kjd!~Z$
7G-?^
int CHookApp::ExitInstance() `{Q'iydU
{ bK~Toz<k
VerifyWindow(); *OFG3 uM
UnInit(); &U|c=$!\
return CWinApp::ExitInstance(); !vR Zh('R
} b- t
`}=R
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =tt3nfZ9
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q: FhuOP
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FV
"pJ
#if _MSC_VER > 1000 X]@"ZV[
#pragma once o|z@h][(l(
#endif // _MSC_VER > 1000 ={oNY.(Q
J$1H3#VVG
class CCaptureDlg : public CDialog \b(&-=(
{ ~KMah
// Construction E;C{i
public: j`RG Moq
BOOL bTray; Z8xB
a0
BOOL bRegistered; .06D_L"M
BOOL RegisterHotkey(); mWaij]1>
UCHAR cKey; =cjO]
UCHAR cMask; ]Rxo}A
void DeleteIcon(); X=]utn
void AddIcon(); ~r8<|$;
UINT nCount; 0@cIj
]
void SaveBmp(); pIcg+~
CCaptureDlg(CWnd* pParent = NULL); // standard constructor qNj?Rwc
// Dialog Data HBE[q#
//{{AFX_DATA(CCaptureDlg) bT2G
G
enum { IDD = IDD_CAPTURE_DIALOG }; \N0vA~N.
CComboBox m_Key; t
sUu
BOOL m_bControl; z6E =%-`
BOOL m_bAlt; EyPJ Jc8
BOOL m_bShift; s~ 8g
CString m_Path; 2Wluc37
CString m_Number; ,k4pW&A
//}}AFX_DATA oxc;DfJ_
// ClassWizard generated virtual function overrides PJN9[Y{^3
//{{AFX_VIRTUAL(CCaptureDlg) B1nm?E 0i
public: C&w0HoF
virtual BOOL PreTranslateMessage(MSG* pMsg); &F~d~;G"q
protected: o(jLirnk
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZJBb%d1;
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fS4W*P[B3
//}}AFX_VIRTUAL sS}:O d
// Implementation Io3-\Ff
protected: $Xlr@)%
HICON m_hIcon; !X-\;3kC0
// Generated message map functions C'$}{%Cc@$
//{{AFX_MSG(CCaptureDlg) 'A:Y&w"r
virtual BOOL OnInitDialog(); :\"0jQ.y|
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -GPBX?
afx_msg void OnPaint(); iG6]Pr|;e
afx_msg HCURSOR OnQueryDragIcon(); .i4aM;Qy
virtual void OnCancel(); zT,@PIC(
afx_msg void OnAbout(); WC~;t4
afx_msg void OnBrowse(); OmWEa
afx_msg void OnChange(); Yt(FSb31H
//}}AFX_MSG E! NtD).=S
DECLARE_MESSAGE_MAP() hp'oiR;~w
}; =exCpW>
#endif e*}zl>f
Ie^Ed`
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file > U?\WgE$
#include "stdafx.h" a`w=0]1&*
#include "Capture.h" >EJ{ *
#include "CaptureDlg.h" KUZi3\p9W>
#include <windowsx.h> wCLniCt
#pragma comment(lib,"hook.lib") )Ac,F6w
#ifdef _DEBUG +S(# 7
#define new DEBUG_NEW mgx|5Otg
#undef THIS_FILE ~+4lmslR
static char THIS_FILE[] = __FILE__; *Sj)9mp
#endif u$%C`v>
#define IDM_SHELL WM_USER+1 :;eOhZ=_
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9S]pC?N]E
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U U_0@V<
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /=6_2t#vA
class CAboutDlg : public CDialog U%:%. Bys
{ [l5jPL}6
public: ~q566k!Ll!
CAboutDlg(); 9/0H,qZc
// Dialog Data *>=tmW;%
//{{AFX_DATA(CAboutDlg) ,Lp"Ia
enum { IDD = IDD_ABOUTBOX }; }VJ>}i*
//}}AFX_DATA ,g7O
// ClassWizard generated virtual function overrides hTLf$_|P
//{{AFX_VIRTUAL(CAboutDlg) L1RD`qXu.
protected: WS n>P7sY
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1iz =i^}
//}}AFX_VIRTUAL _9lMa7i
// Implementation ^\gb|LEnK
protected: Cu#n5SF*
//{{AFX_MSG(CAboutDlg) ?{TWsuP7
//}}AFX_MSG ]}g\te
DECLARE_MESSAGE_MAP() ,V9qiu=m
}; uZn_*_J!
j_90iP^5:
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *x2!N$b
{ qA7,txQ:
//{{AFX_DATA_INIT(CAboutDlg) L%v@|COQ3
//}}AFX_DATA_INIT ]j7`3%4uK
} qLLrR,:
GqCBD-@4v.
void CAboutDlg::DoDataExchange(CDataExchange* pDX) tjtvO@?1-
{ d {U%q
d
CDialog::DoDataExchange(pDX); +&G(AW
//{{AFX_DATA_MAP(CAboutDlg) |"LHo
H
//}}AFX_DATA_MAP ; j.d
} 8X`DFeJ
3 twA5)v
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) zS;ruK%2
//{{AFX_MSG_MAP(CAboutDlg) k)>H=?mI
// No message handlers n`Pl:L*kG
//}}AFX_MSG_MAP Q.B)?w m
END_MESSAGE_MAP() 1r>]XhRFZ
~fkcal1@
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }cMkh
: CDialog(CCaptureDlg::IDD, pParent) h<&GdK2U+
{ 4Px|:7~wT8
//{{AFX_DATA_INIT(CCaptureDlg) a+LK~mC*
m_bControl = FALSE; ,HDhP
m_bAlt = FALSE; ASy?^Jrs5
m_bShift = FALSE; `e'wWV
m_Path = _T("c:\\"); FA,n>
m_Number = _T("0 picture captured."); o$L%t@
nCount=0; |E6_TZ#=
bRegistered=FALSE; c+3(|k-M
bTray=FALSE; 87! jn'A
//}}AFX_DATA_INIT dnD@BQ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >|%3j,<U
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); QTa\&v[f
} Gz{%Z$A~o
M4)U
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n[DRX5OxR'
{ lGYW[0dy
CDialog::DoDataExchange(pDX); #w|v.35%?
//{{AFX_DATA_MAP(CCaptureDlg) eowwN>-2C
DDX_Control(pDX, IDC_KEY, m_Key); Tfh2>
DDX_Check(pDX, IDC_CONTROL, m_bControl); 7#j.yf4
DDX_Check(pDX, IDC_ALT, m_bAlt); 7 w,D2T
DDX_Check(pDX, IDC_SHIFT, m_bShift); hGD@v{/
DDX_Text(pDX, IDC_PATH, m_Path); *bp09XG
DDX_Text(pDX, IDC_NUMBER, m_Number); *D%w r'!>
//}}AFX_DATA_MAP BmpAH}%T
} e]1'D
o7E|wS
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P,pC Z+H
//{{AFX_MSG_MAP(CCaptureDlg) Rnwm6nu
ON_WM_SYSCOMMAND() (Nc~l ^a
ON_WM_PAINT() Vc5>I_
ON_WM_QUERYDRAGICON() ^*f D
ON_BN_CLICKED(ID_ABOUT, OnAbout) }d;2[fR)
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'v<v6vs
ON_BN_CLICKED(ID_CHANGE, OnChange) tUH?N/qn
//}}AFX_MSG_MAP T=YVG@fm?
END_MESSAGE_MAP() '9u?lA^9$
jA9uB.I,"b
BOOL CCaptureDlg::OnInitDialog() AcuZ?LYzK
{ ,(q]
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CDialog::OnInitDialog(); E'4Psx9: =
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4#>Z.sf
ASSERT(IDM_ABOUTBOX < 0xF000); ?u:`?(\
CMenu* pSysMenu = GetSystemMenu(FALSE); L~/,;PHN
if (pSysMenu != NULL) >(P(!^[f
{ lv/im/]v
CString strAboutMenu; l9uocP:D
strAboutMenu.LoadString(IDS_ABOUTBOX); 3 orZBT
if (!strAboutMenu.IsEmpty()) I]d-WTd
{ !{+CzUo@
pSysMenu->AppendMenu(MF_SEPARATOR); 'MW%\W;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;8PO}{rD
} E`_T_O=P
} B /uaRi%
SetIcon(m_hIcon, TRUE); // Set big icon 4F.,Y3
SetIcon(m_hIcon, FALSE); // Set small icon P`@Rt
m_Key.SetCurSel(0); ] :LlOv$
RegisterHotkey(); U%bm{oVn
CMenu* pMenu=GetSystemMenu(FALSE); M`al~9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !y XGAg,
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D*2*FDGI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s i2@k
return TRUE; // return TRUE unless you set the focus to a control 3);P!W4>
} Mrgj*|
D|(\5]:R
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (<>??(VM
{ XgX~K:<jt
if ((nID & 0xFFF0) == IDM_ABOUTBOX) rkji#\_-FV
{ "XxmiK
CAboutDlg dlgAbout; @.E9ml
dlgAbout.DoModal(); swZi
O_85
} >ymn&_zlT
else 34Gu @"
{ ^z!=,M<+{
CDialog::OnSysCommand(nID, lParam); kCD]&
} #&)H&H}
} pW.WJ`Rk
octQ[QXo#
void CCaptureDlg::OnPaint() 7~+Fec`Ut*
{ mvH8hvD9
if (IsIconic()) U9T}iI
{ 'V^M+ng
CPaintDC dc(this); // device context for painting tf 7HhOCYX
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Gn4b*Y&M]3
// Center icon in client rectangle (N&i4O-I
int cxIcon = GetSystemMetrics(SM_CXICON); py7Zh%k
int cyIcon = GetSystemMetrics(SM_CYICON); w( SY
CRect rect; YK{J"Kof
GetClientRect(&rect); 'cc8xC
int x = (rect.Width() - cxIcon + 1) / 2; $"NH{%95}
int y = (rect.Height() - cyIcon + 1) / 2; hfI=9x/
// Draw the icon zZPWE"u}
dc.DrawIcon(x, y, m_hIcon); Q/3*65
} 0,~s0]h0V
else sAU%:W{
{ D~ 3@v+d
CDialog::OnPaint(); x[};x;[ZE
} Qq.$!$
} #tA9`!
5ZkR3/h e
HCURSOR CCaptureDlg::OnQueryDragIcon() >}F$6KM
{ sXEIC#rq
return (HCURSOR) m_hIcon; OEl;R7aOB&
} ?xUl_
)t+pwh!8
void CCaptureDlg::OnCancel() T8\@CV!
{ mK$E&,OkA
if(bTray) _4)
t
DeleteIcon(); :Ef!gpS}?R
CDialog::OnCancel(); zqt<[=O
} oQh;lb
r=3`Eb"t
void CCaptureDlg::OnAbout() iJhieNn
{ Z<>gx m<
CAboutDlg dlg; ]tu
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dlg.DoModal(); % t,42jQ9
} ^A&{g.0
(*r2bm2FPO
void CCaptureDlg::OnBrowse() yNfj-wM
{ B!J?,SB
CString str; ):hz/vZ
BROWSEINFO bi; NLpKh1g
char name[MAX_PATH]; SaGI4O_\s
ZeroMemory(&bi,sizeof(BROWSEINFO)); } 'xGip@W
bi.hwndOwner=GetSafeHwnd(); $/
"+t.ir3
bi.pszDisplayName=name; @bTm.3
bi.lpszTitle="Select folder"; H+I,c1sF
bi.ulFlags=BIF_RETURNONLYFSDIRS; -w2^26ax
LPITEMIDLIST idl=SHBrowseForFolder(&bi); {J1rjrPo
if(idl==NULL) "2%R?
return; D3aX\ NGP
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KO8vUR*2R
str.ReleaseBuffer(); 2m*ugBO;
m_Path=str; p'^}J$
if(str.GetAt(str.GetLength()-1)!='\\') t)8crX}P
m_Path+="\\"; j%3$ytf|p
UpdateData(FALSE); Tx&H1
} bj0HAgY@
'X+aYF}Ye
void CCaptureDlg::SaveBmp() 5K9W5hA:D
{ (9( xJ)
CDC dc; %P1zb7:8
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *IbDA
CBitmap bm; Y<POdbg
int Width=GetSystemMetrics(SM_CXSCREEN); z5({A2q
int Height=GetSystemMetrics(SM_CYSCREEN); vh"';L_*37
bm.CreateCompatibleBitmap(&dc,Width,Height); #]+BIr`
CDC tdc; 4d@0v n{
tdc.CreateCompatibleDC(&dc); M6MxY\uM
CBitmap*pOld=tdc.SelectObject(&bm); mQ}\ptdfV
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); o/,%rA4
tdc.SelectObject(pOld); 74
ptd,
BITMAP btm; 0P$19TN
bm.GetBitmap(&btm); XdIno}pN
DWORD size=btm.bmWidthBytes*btm.bmHeight; 8bMw.u=F
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m8L %!6o
BITMAPINFOHEADER bih; \4$Nx/@Q}
bih.biBitCount=btm.bmBitsPixel; ?~.9:93
bih.biClrImportant=0; l]DRJ
bih.biClrUsed=0; oIOeX1$V
bih.biCompression=0; B> i^ w1
bih.biHeight=btm.bmHeight; N%:uOX8{
bih.biPlanes=1; 7.NL>:lu
bih.biSize=sizeof(BITMAPINFOHEADER); kKbbsB
bih.biSizeImage=size; H4v%$R;K
bih.biWidth=btm.bmWidth; `4@`G:6BL
bih.biXPelsPerMeter=0; :,H_
e!
X
bih.biYPelsPerMeter=0; .Sw4{m[g
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); </<z7V,{
static int filecount=0; n @@tO#!\
CString name; tZ=|1lM
name.Format("pict%04d.bmp",filecount++); /Tl ybSC1
name=m_Path+name; )N{PWSPs
BITMAPFILEHEADER bfh; 8z=o.\@
bfh.bfReserved1=bfh.bfReserved2=0; |#*+#27
bfh.bfType=((WORD)('M'<< 8)|'B'); 4ybOK~z
bfh.bfSize=54+size; oKSW:A
bfh.bfOffBits=54; $(J)F-DB i
CFile bf; wAR:GO'n
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .wm<l:
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ZPM7R3%V)z
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T06w`'aL
bf.WriteHuge(lpData,size); <5]_u:
bf.Close(); 4mBM5Tv
nCount++; UlN}SddI9
} /Y\q&}
GlobalFreePtr(lpData); #9"lL1
if(nCount==1) b N>Ar
m_Number.Format("%d picture captured.",nCount); /mE:2K]C
else \2@9k`
m_Number.Format("%d pictures captured.",nCount); J=^5GfM)J
UpdateData(FALSE); ND9;%<80
} *sfz+8Y
!5m~qet.
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h*P0;V`UX
{ +f]I7e:qp
if(pMsg -> message == WM_KEYDOWN) ]6=opvm
{ aM[fag$c
if(pMsg -> wParam == VK_ESCAPE) cEJ_z(\=hr
return TRUE; Rx%kAt2X
if(pMsg -> wParam == VK_RETURN) &#q%#M:
return TRUE; F+xMXBD@>*
} bg4VHT7?>)
return CDialog::PreTranslateMessage(pMsg); jAt65a
} `b@"GOr
`~=Is.V[
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^kB9
I8u
{ DML0paOm5
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P#A|Pn<p
SaveBmp(); 8r\xQr'8h
return FALSE; . 55aY~We
} jTQN(a9Y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *OE>gg&?Nh
CMenu pop; a~tBg y+9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p-g@cwOu
CMenu*pMenu=pop.GetSubMenu(0); E\}Q9,Z$
pMenu->SetDefaultItem(ID_EXITICON); kr1^`>O5
CPoint pt; d7c m?+
GetCursorPos(&pt); Z[j-.,Qu
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )>=|oY3
if(id==ID_EXITICON) d<;XQ.Wo7
DeleteIcon(); iN`L* h
else if(id==ID_EXIT) ER$~kFE2yP
OnCancel(); kS7T'[d
return FALSE; }>j1j^c1='
} ?~Vev D
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z3T26Uk
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7xT<|3 I
AddIcon();
D3 E!jQ1
return res; 2gjA>ET`N
} 483vFLnF
zwHTtE
void CCaptureDlg::AddIcon() `Sj8<O}
{ naB[0I&
N
NOTIFYICONDATA data; =WP}RZ{S
data.cbSize=sizeof(NOTIFYICONDATA); m7mC
7x
CString tip; }KkH7XksF
tip.LoadString(IDS_ICONTIP); ]gj@r[
data.hIcon=GetIcon(0); .^1=*j(;
data.hWnd=GetSafeHwnd(); 6Ue6b$xE
strcpy(data.szTip,tip); t!Av[K
data.uCallbackMessage=IDM_SHELL; X]CaWxM
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; d}415 XA
data.uID=98; *JOv
Shell_NotifyIcon(NIM_ADD,&data); q`;URkjk
ShowWindow(SW_HIDE); 4 ]8PF
bTray=TRUE; z#*GPA8Em:
} CUw
9aH
1r w>gR
void CCaptureDlg::DeleteIcon() qOa-@MN
{ oq<#
NOTIFYICONDATA data; Bp6Evi
data.cbSize=sizeof(NOTIFYICONDATA);
Q{Bj(f
data.hWnd=GetSafeHwnd(); ||,;07
data.uID=98; &c@I4RV|q
Shell_NotifyIcon(NIM_DELETE,&data); ZNA?`Z)f
ShowWindow(SW_SHOW); o_$r*Z|HG
SetForegroundWindow(); RMrt4:-DI
ShowWindow(SW_SHOWNORMAL); gA) F
bTray=FALSE; uTJ?@^nq
} Cw^)}23R
Wj*6}N/
void CCaptureDlg::OnChange() wy&*6>.
{ O "h+i>|l
RegisterHotkey(); n:!J3pR
} I2l'y8)d
,wEM
BOOL CCaptureDlg::RegisterHotkey() {k]VT4/
{ `RzM)ILl
UpdateData(); =XS'V*
UCHAR mask=0; ta4<d)nB
UCHAR key=0; <*5D0q#~"
if(m_bControl) 3 \WdA$Wx
mask|=4; >)
:d38M
if(m_bAlt) bo"I:)n;
mask|=2; Tp6ysjao
if(m_bShift) nMbV{h ,
mask|=1; #5I "M WA
key=Key_Table[m_Key.GetCurSel()]; t[
MRyi)LF
if(bRegistered){ Wl2>U(lj
DeleteHotkey(GetSafeHwnd(),cKey,cMask); _1JvA-
bRegistered=FALSE; hg>YOf&RG
} ! O>mu6:Rf
cMask=mask; Tuy*Df
cKey=key; 5astv:p,P
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); MU^Z*r
return bRegistered; <z4!m/f[(
} *ZEs5`x
pV+;/y_
四、小结 DpR%s",Q
i!nl%%
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。