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:
+#I~#CV!
^)IL<S&h 一、实现方法
5B.??;xtaV W7[S7kd 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:
&?g!}Ky \ $}UJs <-F #pragma data_seg("shareddata")
&N7:k+E HHOOK hHook =NULL; //钩子句柄
<:{[Zvl'k UINT nHookCount =0; //挂接的程序数目
x>9EVa) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
F.
oP!r static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+$=Wms-z static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
OYtus7q< static int KeyCount =0;
WZ6{(`;#m static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&'yV:g3H #pragma data_seg()
<[5$ {) \HQb#f, 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。
*-!ndbf H6JMN1#t$ 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:
Jx9%8Ek vzm4 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
E|4XQ|B@ cKey,UCHAR cMask)
2V"gqJHv {
5GFnfc} BOOL bAdded=FALSE;
XK/@!ud"` for(int index=0;index<MAX_KEY;index++){
\\G6c4fC if(hCallWnd[index]==0){
,M h/3DPgE hCallWnd[index]=hWnd;
O/^w!
:z' HotKey[index]=cKey;
dDn4nwH HotKeyMask[index]=cMask;
PRlo"kN bAdded=TRUE;
8v=47G KeyCount++;
IC-xCzR break;
f>+}U;)EF }
wG?kcfu }
geN%rD return bAdded;
j p]geV54 }
3cFLU^ //删除热键
'/*c Yv45 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~0'l, {
IIn\{*|mW BOOL bRemoved=FALSE;
x15tQb+ for(int index=0;index<MAX_KEY;index++){
r~2@#gTbl if(hCallWnd[index]==hWnd){
3<lhoD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kZ[yv hCallWnd[index]=NULL;
Ng39D#_) HotKey[index]=0;
f EiEfu HotKeyMask[index]=0;
+;iesULXn bRemoved=TRUE;
:(p
rx
KeyCount--;
:*+BBC break;
.F3LA6se }
%1 ^jd\ }
m.a1 }
j<P%Uy+ return bRemoved;
* !Y3N<>! }
d lLk4a+ !X <n:J }3_G| DLL中的钩子函数如下:
<T/L.>p4 Kcdd=2 [T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
S^VV^O5 ^ {
r8?Lr-; BOOL bProcessed=FALSE;
: 8<^rP if(HC_ACTION==nCode)
X/7_mU>aKT {
3M*[a~ if((lParam&0xc0000000)==0xc0000000){// 有键松开
wP1VQUL switch(wParam)
CgKSK0/a {
?N*@o. case VK_MENU:
p2vUt MaskBits&=~ALTBIT;
sx^? Iw,N' break;
9S1V!Jp case VK_CONTROL:
64>[pZF8 MaskBits&=~CTRLBIT;
uBkny; break;
{-`OE case VK_SHIFT:
_rJSkZO MaskBits&=~SHIFTBIT;
Z_~DTO2Qg break;
FEmlC,% default: //judge the key and send message
gj;G:;1m break;
uWj-tzu }
76r
s)J[*w for(int index=0;index<MAX_KEY;index++){
F_ Cz if(hCallWnd[index]==NULL)
_-\{kJ continue;
Q%1;{5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
TC#B^m`'p {
2U+p@}cQUA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
B"zg85
e bProcessed=TRUE;
3 v$4LY }
#}yFHM?i }
7 ~8Fs@ }
%9Fg1LH42r else if((lParam&0xc000ffff)==1){ //有键按下
=e/4Gs0* switch(wParam)
0U*"OSpF {
PQ1NQy8 case VK_MENU:
bK1`a{ MaskBits|=ALTBIT;
\bSHBTK break;
IEf^.Z case VK_CONTROL:
:{Z^ _;Tf MaskBits|=CTRLBIT;
p&l:937 break;
]qHO{b4k case VK_SHIFT:
deY<+! MaskBits|=SHIFTBIT;
2A
,36, break;
BVp.A] default: //judge the key and send message
K3D $
hb break;
'+zsj0!A }
ahv=HWX k for(int index=0;index<MAX_KEY;index++){
tp2 _OQAQ if(hCallWnd[index]==NULL)
o9\m?~g!E continue;
P`"DepeD if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.WE0T|qDX {
;_&L^)~P$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&L~rq)r/& bProcessed=TRUE;
?.ihWbW_ }
qW >J-,61/ }
MA6%g} o }
obolDha if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
E_rC"_Zte for(int index=0;index<MAX_KEY;index++){
C8q-gP[ if(hCallWnd[index]==NULL)
:+!b8[?Z continue;
;rL$z;}8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
L-$g& - SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
LXV6Ew5E //lParam的意义可看MSDN中WM_KEYDOWN部分
Qf]!K6eR }
FQ)Ekss~C }
".<p R}
qp }
e'&{KD,-T return CallNextHookEx( hHook, nCode, wParam, lParam );
rP4@K%F9jB }
9ksrr{tW lM,:c.R 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:
x&Rp
m<4 y<(.,Nb8 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;f~'7RKy!G BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%TgM-F,8 9Bw"VN]W 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:
_Z2)e*( ?3N86Qj LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
P@?CQvMx {
':$a6f &T if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
X5[sw;rk {
R"([Y#>m //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
}2oJ SaveBmp();
O9)8a] return FALSE;
N*>; ' }
`<~P> …… //其它处理及默认处理
q%9oGYjvQ }
/WVMT]T6^, t%@pyK rzLlM 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。
miSC'! 8:NHPHxB 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。
?,C,q5
T\ cn:VEF:l 二、编程步骤
1j,Y p\\q[6 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";
pE,BE% PX)qA=4q 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
_P1-d`b0 a ApB0)N 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;
Cx~z^YP' 8t!"K_Mkx 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;
#u@!O%MJ Rby7X*.-v 5、 添加代码,编译运行程序。
PQr
N";+ _Tz!~z 三、程序代码
m=V2xoMw6 [y>.)BU ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Cj9Tj'0@I+ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
XZGyh X7 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
BW 7[JD #if _MSC_VER > 1000
^5}3FvW #pragma once
pE N`&'4 #endif // _MSC_VER > 1000
H(s^le:! #ifndef __AFXWIN_H__
o+&sodt|` #error include 'stdafx.h' before including this file for PCH
etVE8N' #endif
e>.xXg6Zn #include "resource.h" // main symbols
5H5Kt9DoW class CHookApp : public CWinApp
]3'd/v@fT {
M(f'qFY=K public:
QNFrkel CHookApp();
VuW19-G // Overrides
~Y[1Me // ClassWizard generated virtual function overrides
QCw<* Id+ //{{AFX_VIRTUAL(CHookApp)
WAbhBA public:
l1S1CS virtual BOOL InitInstance();
K<tg+(3 virtual int ExitInstance();
JnDR(s4(E //}}AFX_VIRTUAL
add-]2` //{{AFX_MSG(CHookApp)
CjGI}t // NOTE - the ClassWizard will add and remove member functions here.
A )cb // DO NOT EDIT what you see in these blocks of generated code !
HZ3<}`P_W //}}AFX_MSG
i1C' DECLARE_MESSAGE_MAP()
<0m;|Ai'W };
R?Qou!*] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
J:a^'' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
QR)eJ5< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-(EqBr@_ BOOL InitHotkey();
:JYOC+#q7 BOOL UnInit();
] W_T(C* #endif
OHw6#N$\ 9'M_t Mm5 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
d?n~9_9e #include "stdafx.h"
=g:\R$lQ #include "hook.h"
jg(A_V #include <windowsx.h>
->(B:Cz #ifdef _DEBUG
_G|6xlO #define new DEBUG_NEW
XQA2uR4h #undef THIS_FILE
S EmD's static char THIS_FILE[] = __FILE__;
;o\wSHc #endif
-E1}mL}I` #define MAX_KEY 100
\q>,c49a{ #define CTRLBIT 0x04
`UR.Rn/x #define ALTBIT 0x02
BJ5#!I%h #define SHIFTBIT 0x01
#z.x3D@^r6 #pragma data_seg("shareddata")
5{> cfN\q HHOOK hHook =NULL;
m[f\I^\%8 UINT nHookCount =0;
T$e_ao| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
I
f(_$> static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
uu>g(q?4II static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
a4yU[KK static int KeyCount =0;
NO1PGen static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
s5HbuyR^ #pragma data_seg()
7^F?key? HINSTANCE hins;
LFC k6 R void VerifyWindow();
>+r2I% BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
vhC"f* //{{AFX_MSG_MAP(CHookApp)
?m6E@.{ // NOTE - the ClassWizard will add and remove mapping macros here.
]2jnY&a5 // DO NOT EDIT what you see in these blocks of generated code!
G r)+O //}}AFX_MSG_MAP
Z6p>R;9n END_MESSAGE_MAP()
I(.XK ucU sAb|]Q(( CHookApp::CHookApp()
H;6V {
o>YRKb // TODO: add construction code here,
2-4%h! // Place all significant initialization in InitInstance
oaHBz_pg }
~EBZlTN 0U<9=[~q7@ CHookApp theApp;
uD"Voh|]= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=ZQIpc {
IYWD_}_
$ BOOL bProcessed=FALSE;
A{QS+fa/ if(HC_ACTION==nCode)
Jj!T7f*-GX {
'&Ku Ba if((lParam&0xc0000000)==0xc0000000){// Key up
(:1j- switch(wParam)
Vk"QcW {
= 4If7 case VK_MENU:
[ ,dsVd MaskBits&=~ALTBIT;
:MVD83?4 break;
a'Z"Yz^Eo case VK_CONTROL:
OQq7|dZu MaskBits&=~CTRLBIT;
F2&KTK break;
G>Q{[m$ case VK_SHIFT:
<
5ow81 MaskBits&=~SHIFTBIT;
.XmD[= break;
j{vzCRa>8 default: //judge the key and send message
MI/1uw break;
]mp.KvB }
__QTlj
for(int index=0;index<MAX_KEY;index++){
y!#1A?|k if(hCallWnd[index]==NULL)
Umqm5*P( continue;
#ua#$&p if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?@nu]~ {
46vz=# ,6L SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0ode&dB bProcessed=TRUE;
C8?/$1|RL }
+#W5Qb}VR }
mUjA9[@ }
oDC3AK& else if((lParam&0xc000ffff)==1){ //Key down
VbN]z: switch(wParam)
p"T4;QBxQ {
G*QQpSp case VK_MENU:
gC 4w&yL MaskBits|=ALTBIT;
4l|Am3vzX break;
mp#5Vc case VK_CONTROL:
,=mn* MaskBits|=CTRLBIT;
43eGfp'
break;
gnv4.f: case VK_SHIFT:
[L 8gG.wy MaskBits|=SHIFTBIT;
sJ,zB[e8 break;
Gqs8$[o default: //judge the key and send message
SbB5J> >7J break;
Z'EZ PuZ!' }
rg`"m for(int index=0;index<MAX_KEY;index++)
R\<^A~(Gl {
k: {$M yK if(hCallWnd[index]==NULL)
M! s&<Bi continue;
=$m|M
m[a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I=1tf;Bsi {
AOTI&v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
O:#to bProcessed=TRUE;
m,pDjf }
$oNkE }
!v^D
j'] }
K1Tzy=Z9j if(!bProcessed){
os>|LPv4 for(int index=0;index<MAX_KEY;index++){
gAE}3// if(hCallWnd[index]==NULL)
eC1cE continue;
'{J!5x?L^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p5*i
d5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?znSA
> }
AVi|JY)> }
"8-]6p3u }
a9"Gg}h\ return CallNextHookEx( hHook, nCode, wParam, lParam );
x>t:&Y M }
Y A;S'dxY _uRgKoiy BOOL InitHotkey()
W4Eo1 E {
y"7?]#$9/ if(hHook!=NULL){
6rRPqO
j nHookCount++;
3&}wfK]X return TRUE;
/_ LUys/0 }
~2pctqMA else
%3q@\:s hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
0s4%22 if(hHook!=NULL)
tUtl>>6Iu nHookCount++;
r`"
? K]rI return (hHook!=NULL);
b2Ct^`|M5 }
d=xweU< BOOL UnInit()
m86w{b$8 {
3i7n"8\$ if(nHookCount>1){
Jx'p\* nHookCount--;
A}$A~g5Ap return TRUE;
8Uc#>Ae'_ }
s,0,w--= BOOL unhooked = UnhookWindowsHookEx(hHook);
e'u9 SpJ if(unhooked==TRUE){
TIS}'c'C nHookCount=0;
w{0UA6 + hHook=NULL;
=6? 3c\ }
H*l8,*M} return unhooked;
~_R=2t{u_ }
|,.glL {4#'`Eejj BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
WhvO-WF {
`/#6k> BOOL bAdded=FALSE;
GXsHc, for(int index=0;index<MAX_KEY;index++){
x5{ zGv.j if(hCallWnd[index]==0){
lT*Hj. hCallWnd[index]=hWnd;
%GAEZH,2sG HotKey[index]=cKey;
n2$*Z6.G HotKeyMask[index]=cMask;
*F&C`] bAdded=TRUE;
e\/Lcng KeyCount++;
6tP^_9njy break;
iA=9Lel }
N2C^'dFj }
oZ!rK/qoA return bAdded;
Vk[m$ }
n-p|7N Cgt{5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Y0U:i.) {
p=eSHs{>A BOOL bRemoved=FALSE;
M,6m* for(int index=0;index<MAX_KEY;index++){
(/c9v8Pr(7 if(hCallWnd[index]==hWnd){
3q<\
\8Y* if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
aWW|.#L hCallWnd[index]=NULL;
r lW HotKey[index]=0;
)V+;7j<"D HotKeyMask[index]=0;
>?I[dYzut bRemoved=TRUE;
C7,Ol0`v KeyCount--;
/f_lWr:9l break;
l 4(-yWC$H }
7Ij FSN> }
aA=qel }
"]`!#5j^WP return bRemoved;
<1V!-D4xu }
y&B~UeB:q Haiuf)a void VerifyWindow()
#m|AQr| {
6f0 WN for(int i=0;i<MAX_KEY;i++){
NO"=\Zn6 if(hCallWnd
!=NULL){ %KRAcCa7
if(!IsWindow(hCallWnd)){ Vhv<w
O Ct
hCallWnd=NULL; ]{Iy<
HotKey=0; &rk/ya[
HotKeyMask=0; vxK}f*d
KeyCount--; K6_{AuL}4
} %J7 ;b<}To
} H7*/
} a+IU<O-J?
} #O qfyY!
G[)QGZ}8b
BOOL CHookApp::InitInstance() HLa|ycB%
{ ,M5J~Ga
AFX_MANAGE_STATE(AfxGetStaticModuleState()); d+Pfi)+(I
hins=AfxGetInstanceHandle(); BY6QJkI9x
InitHotkey(); PWx2<t<;9
return CWinApp::InitInstance(); &`GQS|
} _=8x?fC:rl
wF[^?K '
int CHookApp::ExitInstance() jbGP`b1_
{ KE6[ u*\
VerifyWindow(); H/YZwDx,i
UnInit(); Il>!C\hU
return CWinApp::ExitInstance(); rl[&s\[
} }`M[%]MNc
9psD"=/"
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6O!&!
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8E ^yHd4Y
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ p'ukV(B
#if _MSC_VER > 1000 0k0y'1SL
#pragma once G)M9to
#endif // _MSC_VER > 1000 MW6d-
S2h?Q$e3
class CCaptureDlg : public CDialog
D`2Iy.|!
{ Mq8jPjL
// Construction NAlYfbp
public: 7;+:J;xf66
BOOL bTray; Zw`Xg@;xP
BOOL bRegistered; fXEF]C
BOOL RegisterHotkey(); AMGb6enl
UCHAR cKey;
]8<;,}#
UCHAR cMask; $-EbJ
void DeleteIcon(); _T7tq
void AddIcon(); wZ5+ H%x
UINT nCount; |#Z:v1]"
void SaveBmp(); f)~urGazS
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?n8gB7(FA
// Dialog Data ;gu_/[P
//{{AFX_DATA(CCaptureDlg) U8PSJ0ny
enum { IDD = IDD_CAPTURE_DIALOG }; EQET:a:g
CComboBox m_Key; JFIUD{>fp
BOOL m_bControl; YcBY[i0
BOOL m_bAlt; %c*azo.
BOOL m_bShift; M`-.0
CString m_Path; cF7I
CString m_Number; m\)z& hv<r
//}}AFX_DATA #%rXDGDS
// ClassWizard generated virtual function overrides rp (nGiI
//{{AFX_VIRTUAL(CCaptureDlg) c~K^ooS-
public: PTXy:>]M
virtual BOOL PreTranslateMessage(MSG* pMsg); TLU^ad#9E
protected: _p"nR
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h S/oOeG<Y
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %+ynrg-
//}}AFX_VIRTUAL Y.$'<1
// Implementation FY|.eY_7 {
protected: y'(l]F1]
HICON m_hIcon; PF+v[h;,
// Generated message map functions "qYPi
//{{AFX_MSG(CCaptureDlg) G'{$$+U^K
virtual BOOL OnInitDialog(); Q-k{Lqa-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mFC0f?nr
afx_msg void OnPaint(); ggR@& \
afx_msg HCURSOR OnQueryDragIcon(); :n4?
virtual void OnCancel(); C0eP/d
afx_msg void OnAbout(); _@3@_GE
afx_msg void OnBrowse(); nlQ<Aa-%
afx_msg void OnChange(); C0|<+3uND=
//}}AFX_MSG '5\7>2fI
DECLARE_MESSAGE_MAP() @kw#\%Uz
}; %6}S1fuA
#endif \BOZhXfl'
'8R5?9"
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wuSp+?{5k
#include "stdafx.h" u=JI 1
#include "Capture.h" RcIGIt
#include "CaptureDlg.h" t."hAvRL
#include <windowsx.h> %"Q{|}
#pragma comment(lib,"hook.lib") y w)q3zC
#ifdef _DEBUG &=oW=g 2
#define new DEBUG_NEW D<B/oSy
#undef THIS_FILE NHG+l)y:
static char THIS_FILE[] = __FILE__; uDJi2,|n
#endif ~3<Li}W
#define IDM_SHELL WM_USER+1 #Cks&[!c
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +P2f<~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X YO09#>&
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &^KmfT5C
class CAboutDlg : public CDialog n>T1KC%
{ 484lB}H
public: mojD
CAboutDlg(); >DeG//rv
// Dialog Data P$?3\`U;
//{{AFX_DATA(CAboutDlg) !r]elX
enum { IDD = IDD_ABOUTBOX }; }>Gnpc
//}}AFX_DATA P~$FgAV
// ClassWizard generated virtual function overrides {h5 S=b
//{{AFX_VIRTUAL(CAboutDlg) ;O5p>o
protected: 6Y<'Lyg/
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _R-[*ucq
//}}AFX_VIRTUAL L5=Tj4`
// Implementation {KYbsD
protected: m`l3@Z
//{{AFX_MSG(CAboutDlg) ]@)T]
//}}AFX_MSG !g{9]"Z1T
DECLARE_MESSAGE_MAP() f|G,pDLx
}; @|! 9~F
eJFGgJRIvF
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ij i<+oul
{ d5mhk[p7\J
//{{AFX_DATA_INIT(CAboutDlg) *F|j%]k~
//}}AFX_DATA_INIT *NzHY;e
} \,| Xz|?C
>tTNvb5
void CAboutDlg::DoDataExchange(CDataExchange* pDX) G?e"A0,
{ hyqsMkW|
CDialog::DoDataExchange(pDX); !m)P*Lw
//{{AFX_DATA_MAP(CAboutDlg) >Q':+|K}
//}}AFX_DATA_MAP jkw:h0hX
} <+ 0cQq=2
\W$bOp
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ENW>bS8e`
//{{AFX_MSG_MAP(CAboutDlg) "X4L+]"$g
// No message handlers ~RGZY/4
//}}AFX_MSG_MAP wmbjL=f
Ia
END_MESSAGE_MAP() yDh(4w-~gk
PI@/jh
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Bwv@D4bii
: CDialog(CCaptureDlg::IDD, pParent) 7 \)OWp
{ ej-x^G?C
//{{AFX_DATA_INIT(CCaptureDlg) MN1
kR
m_bControl = FALSE; <8Y;9N|94!
m_bAlt = FALSE; "e.QiK
m_bShift = FALSE; 8 Yfg@"Tn
m_Path = _T("c:\\"); l`D^)~o8
m_Number = _T("0 picture captured."); ."9t<<!
nCount=0; s6Ox!)&
bRegistered=FALSE; )QS4Z{)U
bTray=FALSE; uJ;7]
//}}AFX_DATA_INIT 1d)wE4c=Z
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wO:!B\e
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f@U\2r
} 8l,`~jvU!*
h#a;(F4_7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pUtd_8
{ $%~-p[)<(P
CDialog::DoDataExchange(pDX); 0\3mS{s
//{{AFX_DATA_MAP(CCaptureDlg) nk.m Gny
DDX_Control(pDX, IDC_KEY, m_Key); j/"{tMqQp
DDX_Check(pDX, IDC_CONTROL, m_bControl); ^wesuW@=
DDX_Check(pDX, IDC_ALT, m_bAlt); *K#7,*Oz
DDX_Check(pDX, IDC_SHIFT, m_bShift); r~ gjn`W
DDX_Text(pDX, IDC_PATH, m_Path); R'bmE:nL
DDX_Text(pDX, IDC_NUMBER, m_Number); ILdRN
//}}AFX_DATA_MAP "[(&$I
} py#`
nd)Z0%xo
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h!# (. P
//{{AFX_MSG_MAP(CCaptureDlg) wcGI2aflD
ON_WM_SYSCOMMAND() #D8Z~U,-
ON_WM_PAINT() E#3KWp#M
ON_WM_QUERYDRAGICON() ]iu}5]?)
ON_BN_CLICKED(ID_ABOUT, OnAbout) +oKp>-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Fe8JsB-
ON_BN_CLICKED(ID_CHANGE, OnChange) EX^}#|e*h
//}}AFX_MSG_MAP ];BGJ5^j
END_MESSAGE_MAP() 01v7_*'R
|X&.+RI
BOOL CCaptureDlg::OnInitDialog() hT :+x3
{ o!.\+[
CDialog::OnInitDialog(); Wr3j8"f/
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fBCW/<Z
ASSERT(IDM_ABOUTBOX < 0xF000); E({+2}=1
CMenu* pSysMenu = GetSystemMenu(FALSE); u6&<Bv
if (pSysMenu != NULL) H:9Z.|{Gv
{ 566vjE
CString strAboutMenu; m\a_0!K
strAboutMenu.LoadString(IDS_ABOUTBOX); R?aE:\A
if (!strAboutMenu.IsEmpty()) ,#=ykg*~/
{ / S
pSysMenu->AppendMenu(MF_SEPARATOR); rGb7p`J
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~Ab nksR
} biwV7<
} ~F5JN^5Y
SetIcon(m_hIcon, TRUE); // Set big icon [NQ\(VQ1c
SetIcon(m_hIcon, FALSE); // Set small icon jDI )iW`P
m_Key.SetCurSel(0); 8#% Sq=/+M
RegisterHotkey(); Nxk3uF^
CMenu* pMenu=GetSystemMenu(FALSE); 4o,%}bo&
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 97"dOi!Wh
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $Pa7B]A,Ae
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a*4"j2j v
return TRUE; // return TRUE unless you set the focus to a control w)x`zVwO
} 3L2@C%
qk}(E#.>F\
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q^{Z"ifL
{ k2>gnk0
if ((nID & 0xFFF0) == IDM_ABOUTBOX) z;Pr] *F
{ ]RYk Y7>`
CAboutDlg dlgAbout; nya-Io.
dlgAbout.DoModal(); -QH[gi{%`
} dc#Db~v}k
else (hywT)#+
{ -[-LR }u
CDialog::OnSysCommand(nID, lParam); vIBVp
} Jvi"K
} c&zZsJ"~
!]bXHT&!R
void CCaptureDlg::OnPaint() `c
3IS5
{ 8o' a
if (IsIconic()) EJqzh
i5
{ iUuG}rqj
CPaintDC dc(this); // device context for painting -$pS
{q;
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]W,K}~!
// Center icon in client rectangle >z0~!!YZ
int cxIcon = GetSystemMetrics(SM_CXICON); -ya0!D
int cyIcon = GetSystemMetrics(SM_CYICON); XD\RD
CRect rect; +R7";.
GetClientRect(&rect); &{ B-a
int x = (rect.Width() - cxIcon + 1) / 2; oZvQ/|:p!
int y = (rect.Height() - cyIcon + 1) / 2; HnvE\t9`
// Draw the icon q/w U7P\%
dc.DrawIcon(x, y, m_hIcon); ucm3'j
} .0x+b-x
else urGk_.f
{ wk {9
CDialog::OnPaint(); z`gdE0@;d3
} QusEWq)}<
} StUiL>9T#
k;V4%O
HCURSOR CCaptureDlg::OnQueryDragIcon() @\gTi;u/x
{ Q;O\tl
return (HCURSOR) m_hIcon; wn*z*
} z1\G,mJK
Mwdh]I,#
void CCaptureDlg::OnCancel() .K![<eZ
{ /'|'3J]HP
if(bTray) m35Blg34
DeleteIcon(); A`4Di8'Me
CDialog::OnCancel(); KMz\h2X
} |_l\.
>V~q`htth
void CCaptureDlg::OnAbout() @Z$`c{V<
{ @_0g "Ul
CAboutDlg dlg; &fBLPF% 6
dlg.DoModal(); a,Gd\.D
} gi`K^L=C
zUn>
)#ZC
void CCaptureDlg::OnBrowse() eqbxf#H!
{ l ' ]d&
CString str; Wpom {-
BROWSEINFO bi; 9kPwUAw
char name[MAX_PATH]; { .KCK_ d
ZeroMemory(&bi,sizeof(BROWSEINFO));
TQ&%SMCn
bi.hwndOwner=GetSafeHwnd(); hq9b
bi.pszDisplayName=name; +Q, 0kv
bi.lpszTitle="Select folder"; LV:oNK(
bi.ulFlags=BIF_RETURNONLYFSDIRS; IY|;}mIF
LPITEMIDLIST idl=SHBrowseForFolder(&bi); W5-p0,?[6
if(idl==NULL) GE$spx
return; R7us9qM4e
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); v _Bu
str.ReleaseBuffer(); i|>K
m_Path=str; 8F0+\40
if(str.GetAt(str.GetLength()-1)!='\\') ,hK0F3?H>
m_Path+="\\"; lo:]r.lX{
UpdateData(FALSE); Du>dTi~
} VVuL+i
#bPio
void CCaptureDlg::SaveBmp() p$}iBk0B(z
{ -@ #b<"1
CDC dc; woZ'T
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *iF>}yh e
CBitmap bm; puS'9Lpp
int Width=GetSystemMetrics(SM_CXSCREEN); ]I"oS?
int Height=GetSystemMetrics(SM_CYSCREEN); p#.B Fy
bm.CreateCompatibleBitmap(&dc,Width,Height); XgKtg-,
CDC tdc; dQ^>,(
tdc.CreateCompatibleDC(&dc); Uq)|]a&e
CBitmap*pOld=tdc.SelectObject(&bm); 3+m#v8h1
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q`09
tdc.SelectObject(pOld); )8oI
s
BITMAP btm; wgSA6mQZ
bm.GetBitmap(&btm); ,_`\c7@
DWORD size=btm.bmWidthBytes*btm.bmHeight; KdFQlQaj
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @Z!leyam
BITMAPINFOHEADER bih; zW%-Z6%D
bih.biBitCount=btm.bmBitsPixel; !mpRLBH
bih.biClrImportant=0; D8_m_M|P
bih.biClrUsed=0; 'j$iS W&
bih.biCompression=0; io
cr
bih.biHeight=btm.bmHeight; xc R
bih.biPlanes=1; s)yEVh
bih.biSize=sizeof(BITMAPINFOHEADER); +3vK=d_Va
bih.biSizeImage=size; :c,\8n
bih.biWidth=btm.bmWidth; Rs)tf|`/
bih.biXPelsPerMeter=0; kgK7 T
bih.biYPelsPerMeter=0; }jTE gog
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Js qze'BGY
static int filecount=0; )8&Q.? T
CString name; EA75
D&>I
name.Format("pict%04d.bmp",filecount++); _6qf>=qQ`"
name=m_Path+name; BW:&AP@B
BITMAPFILEHEADER bfh; 5L|yF"TI#
bfh.bfReserved1=bfh.bfReserved2=0; qB@]$
bfh.bfType=((WORD)('M'<< 8)|'B'); .CI]8O"3y
bfh.bfSize=54+size; ~=%eOoZP;c
bfh.bfOffBits=54; uW4G!Kw28
CFile bf; D>c%5h
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =(*Eh=Pw
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `e~/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :RHNV
bf.WriteHuge(lpData,size); PiI ):B>
bf.Close(); }K;@$B6,@
nCount++; FqsG#6|x
} 3z:
rUhA
GlobalFreePtr(lpData); qYIBP?`g
if(nCount==1) EBw}/y{Kt
m_Number.Format("%d picture captured.",nCount); u4$d#0sA
else KK]AX;
m_Number.Format("%d pictures captured.",nCount); JU<<,0
UpdateData(FALSE); ix^:qw;
} yqlkf$?
"eI-Y`O,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qChS} Q
{ J~ v<Z/gm
if(pMsg -> message == WM_KEYDOWN) xm~ff+(&@S
{ 60~{sk~E
if(pMsg -> wParam == VK_ESCAPE) *~ 4uF
return TRUE; F.?:Gd1
if(pMsg -> wParam == VK_RETURN) x:;8U i"&B
return TRUE; &4"(bZ:LO
} Q(AOKp,F
return CDialog::PreTranslateMessage(pMsg); 2b1LC!'U
} ..<(HH2
l/LRr.x
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ezwcOYMXK
{ :@_CQc*yB
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n5S$Dl
SaveBmp(); nUmA
return FALSE; ErB6fl
} {>QrI4*A
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +ls *04
CMenu pop; HJBUN1n
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }K"=sE
CMenu*pMenu=pop.GetSubMenu(0); A &w)@DOe
pMenu->SetDefaultItem(ID_EXITICON); E3,Z(dpX!
CPoint pt; }'kk}2ej`
GetCursorPos(&pt); ]|Vm!Q
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L4.yrA-]C%
if(id==ID_EXITICON) bvEk.~tC'
DeleteIcon(); *KxV;H8/
else if(id==ID_EXIT) }E8 Y,;fTD
OnCancel(); PhKJ#DRbr
return FALSE; tDEpR
} %~Nf,
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `mw@"
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W@"M/<r@/
AddIcon(); yuFuYo&[?v
return res; ?ZlwRjB\
} P;hjr;
3m7$$N|
void CCaptureDlg::AddIcon() _sZ/tU@_-K
{ F1Egcx/$V
NOTIFYICONDATA data; HW.S~eLw*
data.cbSize=sizeof(NOTIFYICONDATA); qK|r+}g|&
CString tip; +tfmBZl^
tip.LoadString(IDS_ICONTIP); b)@D*plS&
data.hIcon=GetIcon(0); {!^HG+
data.hWnd=GetSafeHwnd(); U@f3V8CPy
strcpy(data.szTip,tip); o>U%3-+T^J
data.uCallbackMessage=IDM_SHELL; w^R5/#F_r
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; s_`wLQ7e
data.uID=98; 7jts;H=
Shell_NotifyIcon(NIM_ADD,&data); An]*J|nFIY
ShowWindow(SW_HIDE); W'gCFX
bTray=TRUE; pPQ]#v
} 'O\K Wj{
Dvd.Q/f
void CCaptureDlg::DeleteIcon() ^Po\:x%o
{ k qwS/s
NOTIFYICONDATA data; Ta/G
data.cbSize=sizeof(NOTIFYICONDATA); ?/dz!{JC
data.hWnd=GetSafeHwnd(); `mCcD
data.uID=98; >Cd%tIie*
Shell_NotifyIcon(NIM_DELETE,&data); q;kMeE*
ShowWindow(SW_SHOW); u#J5M
SetForegroundWindow(); *WMcE$w/D
ShowWindow(SW_SHOWNORMAL); ?0'bf y]
bTray=FALSE; |C>Yd*E,C
} H7qda'%>
VJ_E]}H
void CCaptureDlg::OnChange() Mqw&%dz'_
{ \8Blq5n-O*
RegisterHotkey(); 9=3V}]^M
} "]MF =-v
;=h^"et
BOOL CCaptureDlg::RegisterHotkey() HLk}E*.mC
{ & rw|fF|]
UpdateData(); u{6*}6@fi
UCHAR mask=0; OY"{XnPZ
UCHAR key=0; /jj}.X7yH
if(m_bControl) [&+wW
mask|=4; !EpP-bq'*
if(m_bAlt) Grjm9tbX}
mask|=2; [gv2fqpP
if(m_bShift) uY
"88|
mask|=1; #exE~@fy-
key=Key_Table[m_Key.GetCurSel()]; {_(;&\5
if(bRegistered){ mi97$Cr2
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (x.K%QC)
bRegistered=FALSE; KsUsj3J
} % j^=
cMask=mask; Atfon&^
cKey=key; 3$HFHUMQsk
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P?TFX.p7
return bRegistered; Hk6Dwe[y
} :kFWUs=
?FMHK\
四、小结 KY|Q#i|pM
[xI@)5Xk
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。