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:
n0Qh9*h
H>gWxJ
5 一、实现方法
<=B1"'\ IM l9\U 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:
b(+w.R(+Ti ,%"\\#3S #pragma data_seg("shareddata")
g~bf! HHOOK hHook =NULL; //钩子句柄
BH.:_Qrbh[ UINT nHookCount =0; //挂接的程序数目
^bZ<9} static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
k~'?"' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
l}U~I
3}). static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
z7NGpA( static int KeyCount =0;
FZeN, static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
PV5TG39qQ #pragma data_seg()
6qz!M ,f-T1v" 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。
n.;5P {V1 uFA|rX 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:
~@)-qV^~ Vz=j)[ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\N'hbT= cKey,UCHAR cMask)
R{2GQB {
"-~D!{rS BOOL bAdded=FALSE;
5~<a>> for(int index=0;index<MAX_KEY;index++){
IPr*pQ{;c if(hCallWnd[index]==0){
(;Dn%kK hCallWnd[index]=hWnd;
#*ZnA, HotKey[index]=cKey;
!."%M^J HotKeyMask[index]=cMask;
;f\R$u- bAdded=TRUE;
SopNtcu! KeyCount++;
Vsm%h^]d break;
"63zc1 }
)cv0$ }
`-9*@_-=M return bAdded;
j?Jd@(*y$ }
$_I%1 //删除热键
Os]!B2j14 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9;xL!cy {
.:|#9%5 BOOL bRemoved=FALSE;
0NuL9 for(int index=0;index<MAX_KEY;index++){
HNkZ1+P { if(hCallWnd[index]==hWnd){
F$sF
'cw if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Fw_bY/WN{ hCallWnd[index]=NULL;
'JW_]z1 HotKey[index]=0;
.zSimEOF HotKeyMask[index]=0;
s[{:>~{iq bRemoved=TRUE;
-x3tx7% KeyCount--;
"p6:ekw break;
#qiGOpTF. }
[][:/~q! }
tnKpn-LPA }
TS~Y\Cp return bRemoved;
cfy/*| }
Xdp`Z'g ]Gi+Z1q
E&T'U2 DLL中的钩子函数如下:
hq& j
44bF/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
nIN%<3U2 {
YiQeI|{oN BOOL bProcessed=FALSE;
0.{oA`5N if(HC_ACTION==nCode)
FRJ:ym=E {
8wH41v67F if((lParam&0xc0000000)==0xc0000000){// 有键松开
zDGg\cPj9 switch(wParam)
\3js} {
\4`saM /x case VK_MENU:
%RT6~0z MaskBits&=~ALTBIT;
J!TK*\a2 break;
`)(
<g case VK_CONTROL:
{TxVRpiP{Z MaskBits&=~CTRLBIT;
:vgh
KI break;
nV,{w4t+ case VK_SHIFT:
R1b
) MaskBits&=~SHIFTBIT;
1X!f!0=g+ break;
y uK5 r default: //judge the key and send message
"DcueU#! break;
< 4EB|@E }
*F%ol;|Q for(int index=0;index<MAX_KEY;index++){
Kj1#R if(hCallWnd[index]==NULL)
D0E"YEo\nv continue;
CrwcYzrRWl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]`i@~Z h\ {
~XT
a= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
p*W ZY=Q bProcessed=TRUE;
@qr3v>3X< }
]9yA0,z/ }
lo]B5_en }
l_q>(FoqA else if((lParam&0xc000ffff)==1){ //有键按下
[:hy switch(wParam)
V[M$o {
coP$7Q . case VK_MENU:
U~B}vt MaskBits|=ALTBIT;
=Gg)GSL^ break;
g#KToOP case VK_CONTROL:
MIXrLh3 MaskBits|=CTRLBIT;
@,>=X:7 break;
~|B!.+ case VK_SHIFT:
xfF&$K" MaskBits|=SHIFTBIT;
X%R^)zKV break;
-z~ V default: //judge the key and send message
/>2$
XwP break;
Mpl,}Q!c }
]JCB^)tM for(int index=0;index<MAX_KEY;index++){
c7TWAG_+ if(hCallWnd[index]==NULL)
5P t} continue;
9{^B
Tc
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:7PSZc:xE {
XL&eJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ka9v2tE\ bProcessed=TRUE;
'N5r2JL[w }
t=pkYq5t8 }
'/qe#S }
U%PMV?L{ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
mX_Uhpw?t for(int index=0;index<MAX_KEY;index++){
-Fw4;&> if(hCallWnd[index]==NULL)
F]&J%i
F[ continue;
2T2#HP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.2 SIU4[P SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
JU2' ~chh //lParam的意义可看MSDN中WM_KEYDOWN部分
s8I77._s }
\iLd6Qo_aq }
HE<%d }
$6?KH7lA return CallNextHookEx( hHook, nCode, wParam, lParam );
jw%FZ }
#FDu4xi 1sJJ"dC.w 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
z^GGJu%vjr {Ll8@'5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jnLu| W& BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
H&Lbdu~E =
Ow&UI 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
*l8vCa9Y [x()^{;2 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+CHO0n {
F-OZIo if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
cFNtY~(b {
NU\t3JaR //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
J-{E`ibGN SaveBmp();
@5@{Es1u return FALSE;
; 8x^9Q }
#7:9XID / …… //其它处理及默认处理
D)eKq!_ }
o;-!?uJ 2{tJ'3 L=Jk"qWV0 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
dz.MH >t<R6f_Q0 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
+fR`@HI Oes+na'^ 二、编程步骤
Fi=8B&j O9IjU10: 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
'GO..m"G 2/gj@>dt 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
T`DlOi]Z_ ^?0,G>I%- 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
F(n))`( 2x J5 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
>\Pj(,' ]6 7wk 5、 添加代码,编译运行程序。
yBjWPx? !7kOw65+0 三、程序代码
0#nXxkw I8>1RXz ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
vPq\reKe #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
W@}5e-q)O #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
v2z/|sG #if _MSC_VER > 1000
)bg,rESM #pragma once
KT?s\w #endif // _MSC_VER > 1000
x%7x^]$ #ifndef __AFXWIN_H__
qk"=nAJX #error include 'stdafx.h' before including this file for PCH
&otgN<H9 #endif
i 58CA? #include "resource.h" // main symbols
Yx/~8K_%M? class CHookApp : public CWinApp
+FK<j;}C7 {
} R6h public:
*\+'tFT6 CHookApp();
#gT^hl5/ // Overrides
%),O9*[9 // ClassWizard generated virtual function overrides
R63d
`W //{{AFX_VIRTUAL(CHookApp)
nvs7s0@Fqe public:
cO+`8`kv virtual BOOL InitInstance();
TzXl ?N virtual int ExitInstance();
v wD(J.; //}}AFX_VIRTUAL
DKCy h` //{{AFX_MSG(CHookApp)
^%@.Vvz< // NOTE - the ClassWizard will add and remove member functions here.
?wY.B // DO NOT EDIT what you see in these blocks of generated code !
gJv^v`X //}}AFX_MSG
{vlh,0~ DECLARE_MESSAGE_MAP()
Oz7v
hOU };
:!\./z8v LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
'gH#\he[Dh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
i kiy>W8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$KFWV2P BOOL InitHotkey();
aN3{\^ BOOL UnInit();
{q4"x5| #endif
fX|,s2-FW /L Tyiiz6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6K0*?j{;" #include "stdafx.h"
jO.E#Ei}~ #include "hook.h"
nClU5 #include <windowsx.h>
=Z$6+^L #ifdef _DEBUG
>D aS*r #define new DEBUG_NEW
zvj >KF|y #undef THIS_FILE
Vs{sB*: static char THIS_FILE[] = __FILE__;
V(0[QA #endif
s3^SjZb #define MAX_KEY 100
)G gx #define CTRLBIT 0x04
gf>5xf{M #define ALTBIT 0x02
;zG|llX #define SHIFTBIT 0x01
o(qmI/h #pragma data_seg("shareddata")
"j>0A
Hem HHOOK hHook =NULL;
sl 5wX UINT nHookCount =0;
+w5?{J static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
nQ6'yd" static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}@4*0_g"Aw static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
4v
.6_ebL static int KeyCount =0;
5gEK$7Vp static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
n-_w0Y #pragma data_seg()
~?r6Ax-R HINSTANCE hins;
pn|{P<b\ void VerifyWindow();
"de:plMofy BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
vt,X:3 //{{AFX_MSG_MAP(CHookApp)
Kwnu|8 // NOTE - the ClassWizard will add and remove mapping macros here.
DdgFBO // DO NOT EDIT what you see in these blocks of generated code!
h]$zub //}}AFX_MSG_MAP
/#5ZP\e END_MESSAGE_MAP()
JN!YRcj )]R8
$S CHookApp::CHookApp()
"bH ~CG:Y {
q<7n5kJ~ // TODO: add construction code here,
w6 .HvH-@? // Place all significant initialization in InitInstance
`rV,<
}
| <$O5b' "k/@tX1:R CHookApp theApp;
VxoMK7'O=/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
".4^?d_^VF {
rz*Jm n b BOOL bProcessed=FALSE;
-:q7"s-}b if(HC_ACTION==nCode)
k,& QcYw {
@pz2}Hd| if((lParam&0xc0000000)==0xc0000000){// Key up
&I= q% switch(wParam)
@ XMC$s {
<^paRKEa+# case VK_MENU:
{HeMdGn9 MaskBits&=~ALTBIT;
CqV
\:50g break;
2]wh1) case VK_CONTROL:
]&>)=b!, MaskBits&=~CTRLBIT;
#96a7K break;
#oI`j
q case VK_SHIFT:
i%2K%5{)$D MaskBits&=~SHIFTBIT;
.v{ty break;
u9Ro=#xt default: //judge the key and send message
mx2 Jt1 break;
+W`~bX+ }
pppbn]%Ob for(int index=0;index<MAX_KEY;index++){
Q@R8qc=* if(hCallWnd[index]==NULL)
(%1*<6ka continue;
*:(t.iL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
c9@* {
kQ+5pFo3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
HZNX1aQ|Q# bProcessed=TRUE;
gqG"t@Y+ }
!O*n6}nPE }
<V{BRRx }
QHK$ else if((lParam&0xc000ffff)==1){ //Key down
aUV>O`|_ switch(wParam)
\JchcQ {
S{ !hpq~o case VK_MENU:
(TPD!= MaskBits|=ALTBIT;
hS
Sq=(S break;
BKk*<WMD case VK_CONTROL:
$8)/4P?OL MaskBits|=CTRLBIT;
O{PRK5 ^h break;
gTT-7 case VK_SHIFT:
53A=Ogk8S MaskBits|=SHIFTBIT;
'J}lnt[V break;
9 +6"<r! default: //judge the key and send message
vs+N{ V break;
(@zn[Nq }
%{Gqhb=u\ for(int index=0;index<MAX_KEY;index++)
5"+* c@L {
i~4Kek6,I if(hCallWnd[index]==NULL)
S1."2AxO continue;
!?96P|G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@47TDCr {
HhO$`YZ%> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x=k$^V~ bProcessed=TRUE;
Dqki}k~{ }
QnqX/vnR }
,=FYf|Z }
Z6I!4K if(!bProcessed){
H={,zZ11{ for(int index=0;index<MAX_KEY;index++){
-{?Rq'H if(hCallWnd[index]==NULL)
_v\QuI6 continue;
()iJvf>@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
I('l)^m% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
a[/p(O }
p w,.*N3P }
(/^&3xs9 }
<]<50 return CallNextHookEx( hHook, nCode, wParam, lParam );
m~v
Ie c }
u^uW<.#z V}( "8L BOOL InitHotkey()
S9.jc@#.` {
W $y?~2 if(hHook!=NULL){
"H({kmR nHookCount++;
x-"7{@lz
return TRUE;
r=vE0;7 }
+CACs7tV else
,i}"e(f hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Y9Pb if(hHook!=NULL)
tC;D4i nHookCount++;
|D\ ukml return (hHook!=NULL);
8w\&QX }
w v1R
]3} BOOL UnInit()
TS-[p d {
!j(R_wOq if(nHookCount>1){
_&T$0SZco nHookCount--;
;,<s'5icyg return TRUE;
B::vOg77 }
TZ/u"' ZS BOOL unhooked = UnhookWindowsHookEx(hHook);
"/q6E if(unhooked==TRUE){
wL{Qni3A nHookCount=0;
>+1bTt/-F hHook=NULL;
f~53:;L/ }
V{8mx70 return unhooked;
V/03m3!q }
>uVG] F$caKWzny5 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
__a9}m4i7x {
7':|f " BOOL bAdded=FALSE;
aW"BN 5eM> for(int index=0;index<MAX_KEY;index++){
-+z^{*\;N if(hCallWnd[index]==0){
GK)hK-
hCallWnd[index]=hWnd;
*2 [r?! HotKey[index]=cKey;
\d6A<(!=v HotKeyMask[index]=cMask;
{BF$N#7 bAdded=TRUE;
V
Bg\)r[ KeyCount++;
p4/D%*G^` break;
;2U`?" }
2JbCYCTC }
ej0q*TH. return bAdded;
D;Z\GnD }
dfNNCPu]+ Wg#>2)> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<h^vl-L> {
0s(G*D2%6 BOOL bRemoved=FALSE;
8garRB{ for(int index=0;index<MAX_KEY;index++){
~; MRQE if(hCallWnd[index]==hWnd){
lwV#j}G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
f>Ge
Em~ hCallWnd[index]=NULL;
+ 505 HotKey[index]=0;
G-Y8<mEh HotKeyMask[index]=0;
Baq&>] bRemoved=TRUE;
s01n[jQ KeyCount--;
x]F:~(P break;
M]oaWQu }
V
]Z{0 }
.(! $j-B }
7r:!HmRl return bRemoved;
Zb@PwH4 }
/:B!hvpw >2%!=q3) void VerifyWindow()
R@;kYS {
%/4ChKf!VR for(int i=0;i<MAX_KEY;i++){
SoCa_9*X if(hCallWnd
!=NULL){ ;XANITV
if(!IsWindow(hCallWnd)){ Nl0*"}`I_
hCallWnd=NULL; qg|SBQ?6
HotKey=0; ]c*&5c$
HotKeyMask=0; aK'BC>uFI
KeyCount--; v&|o5om
} /op8]y
} E<0Y;tR
} 'v?Z~"w=
} f`T#=6C4|
2|m461
BOOL CHookApp::InitInstance() |SCO9,Fs
{ w?Y;pc}1B
AFX_MANAGE_STATE(AfxGetStaticModuleState()); @2V#bK
hins=AfxGetInstanceHandle(); L_Z>*s&
InitHotkey(); ?8pR RzV$
return CWinApp::InitInstance(); c1c8):o+V
} )A,MTi
7V?TLGgd$
int CHookApp::ExitInstance() \#L}KW
{ (r.[b
VerifyWindow(); bIR7g(PJ.b
UnInit(); 9[T}cN=|
return CWinApp::ExitInstance(); rQCj^=cf;~
} Ean
#>h
ht)J#Di
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [8[g_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n{aD4&
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OLTgBXh
#if _MSC_VER > 1000 'V/+v#V+>
#pragma once eX>x
+]l6
#endif // _MSC_VER > 1000 U8 '}(
TF2'-"2Y
class CCaptureDlg : public CDialog h<JV6h :8
{ C`Zz\DNG@
// Construction &Yb!j
public: O(#DaFJv
BOOL bTray; icH\(
BOOL bRegistered; CKCot
BOOL RegisterHotkey(); 4"7/+6Z
UCHAR cKey; w6aq/m"'
UCHAR cMask; G?*)0`~W
void DeleteIcon(); lG6P+ Z/nf
void AddIcon(); 'a[|'
UINT nCount; t[ cHdI
void SaveBmp(); .]24V!J(1w
CCaptureDlg(CWnd* pParent = NULL); // standard constructor q-}qrg
// Dialog Data JYc;6p$<i
//{{AFX_DATA(CCaptureDlg) R `
enum { IDD = IDD_CAPTURE_DIALOG }; c <Fr^8
CComboBox m_Key; /?VwoSgV^
BOOL m_bControl; g[4pG`z
BOOL m_bAlt; _c,c;
BOOL m_bShift; ^zn&"@
CString m_Path; +8h!@
CString m_Number; n
'gU
//}}AFX_DATA dg-nv]7
// ClassWizard generated virtual function overrides j`7q7}
//{{AFX_VIRTUAL(CCaptureDlg) Bq@_/*'*Y
public: bi~1d"j
virtual BOOL PreTranslateMessage(MSG* pMsg); }hRw{#*8
protected: ozB2L\D7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9vZ:oO
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =#0f4z
//}}AFX_VIRTUAL F=EG#<@u
// Implementation ~>SqJ&-moo
protected: :Y>FuE
HICON m_hIcon; hh#p=Y(f
// Generated message map functions 9X/]O<i,Es
//{{AFX_MSG(CCaptureDlg) Kjzo>fIC{
virtual BOOL OnInitDialog(); PUcxlD/a}
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "RcNy~
afx_msg void OnPaint(); K,j'!VQA4g
afx_msg HCURSOR OnQueryDragIcon(); O3 NI
virtual void OnCancel(); 3127 4O
afx_msg void OnAbout(); >\[/e{Q"
afx_msg void OnBrowse(); ;S0Kf{DN2
afx_msg void OnChange(); W-D{cU
//}}AFX_MSG sBm)D=Kll
DECLARE_MESSAGE_MAP() LT[g
+zGB
}; c]}F$[>oN'
#endif ?&Ug"$v
SR_<3WW
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v9*31Jx
#include "stdafx.h" lWPh2k
#include "Capture.h" YpJJ]Rszg
#include "CaptureDlg.h" VDT.L,9
#include <windowsx.h> tzJ7wXRr
#pragma comment(lib,"hook.lib") ,i)wS1@
#ifdef _DEBUG zCji]:
#define new DEBUG_NEW 18nT
Iz_
#undef THIS_FILE 3Zdwt\OQ
static char THIS_FILE[] = __FILE__; QlE]OAdB42
#endif WIKSz
{"=/
#define IDM_SHELL WM_USER+1 L _D #
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )5Wt(p:T6_
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &$yxAqdab
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WF] |-)vw
class CAboutDlg : public CDialog {:]u 6l
{ BD,J4xH;
public: g>E.Snj}
CAboutDlg(); k@Qd:I;;
// Dialog Data 2Y>#FEW/
//{{AFX_DATA(CAboutDlg) 4ibOVBG:*,
enum { IDD = IDD_ABOUTBOX }; #?"^: ,Y
//}}AFX_DATA ;"B@QPX
// ClassWizard generated virtual function overrides []:&WA9N
//{{AFX_VIRTUAL(CAboutDlg) (h"-#q8$
protected: PCx:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d0V*[{
//}}AFX_VIRTUAL w~4T.l#1
// Implementation I9Lt>*
protected: [,L>5:T
//{{AFX_MSG(CAboutDlg) l#IN)">1
//}}AFX_MSG YJGP8
DECLARE_MESSAGE_MAP() otA'+4\
}; [[#zB-|
m`BE{%
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |BBo
{
XFSHl[uS1
//{{AFX_DATA_INIT(CAboutDlg) +I3j2u8L
//}}AFX_DATA_INIT i0nu5kD+d
} nT
:n>ja
W#&BU-|2
void CAboutDlg::DoDataExchange(CDataExchange* pDX) X'{o/U.
{ ?U+nR/H:6
CDialog::DoDataExchange(pDX); DGbEQiX$\
//{{AFX_DATA_MAP(CAboutDlg) !?)aZ |r
//}}AFX_DATA_MAP I;Pd}A_}=_
} yXQ 28A
6t=)1T
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .WLwAL
//{{AFX_MSG_MAP(CAboutDlg) u-M Td
// No message handlers #+&"m7
s
//}}AFX_MSG_MAP tH=jaFJ
END_MESSAGE_MAP() <!=:{&d%
GC`/\~TM
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v,|jmv+:
: CDialog(CCaptureDlg::IDD, pParent) MzMVs3w|
{ wEZieHw
//{{AFX_DATA_INIT(CCaptureDlg) T]x]hQ
m_bControl = FALSE; bgeJVI
m_bAlt = FALSE; MFn\[J`Ra
m_bShift = FALSE; "[ieOFI
m_Path = _T("c:\\"); M1=eS@
m_Number = _T("0 picture captured."); {>UT'fa-
nCount=0; .On3ZN
bRegistered=FALSE; h<G7ocu !
bTray=FALSE; ; GEr8_7
//}}AFX_DATA_INIT h t3P@;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =6a=`3r!I
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); G/ H>M%M
} qND:LP\_v
SohNk9u[8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E|3[$?=R
{ </pt($
CDialog::DoDataExchange(pDX); @HE<\Z{ KI
//{{AFX_DATA_MAP(CCaptureDlg) .P#t"oW}
DDX_Control(pDX, IDC_KEY, m_Key); +
B<7]\\M
DDX_Check(pDX, IDC_CONTROL, m_bControl); N6Dv1_c,
DDX_Check(pDX, IDC_ALT, m_bAlt); xb2j
|KY7
DDX_Check(pDX, IDC_SHIFT, m_bShift); *B)10R
DDX_Text(pDX, IDC_PATH, m_Path); NIAji3
DDX_Text(pDX, IDC_NUMBER, m_Number); G\R6=K:f7
//}}AFX_DATA_MAP %?3$~d\n
} jx'hxC'3
CF6qEG6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9"?;H%.
//{{AFX_MSG_MAP(CCaptureDlg) BoXPX2:
ON_WM_SYSCOMMAND() =zR9^k
ON_WM_PAINT() Yyw9IYB;
ON_WM_QUERYDRAGICON() @"B{k%+
ON_BN_CLICKED(ID_ABOUT, OnAbout) ydMhb367|
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) f\FqZ?w
ON_BN_CLICKED(ID_CHANGE, OnChange) 0v#p4@Z
//}}AFX_MSG_MAP /IlO
END_MESSAGE_MAP() _FU}IfG>t
3:<[;yo
BOOL CCaptureDlg::OnInitDialog() MP_/eC ;
{ XZ2 ji_D
CDialog::OnInitDialog(); w\M"9T
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fZ(k"*\MZ
ASSERT(IDM_ABOUTBOX < 0xF000); XP[~ :+
CMenu* pSysMenu = GetSystemMenu(FALSE); K#Xl)h}y7
if (pSysMenu != NULL) Tv `&
{ 8@ S@^C*F
CString strAboutMenu; ,Iru_=Wk~
strAboutMenu.LoadString(IDS_ABOUTBOX); w4FYd
if (!strAboutMenu.IsEmpty()) ~R\ $Z
{ MAp#1+k
pSysMenu->AppendMenu(MF_SEPARATOR); ..x2
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P'<j<h6
} oBs5xH7@-
} \~r_S
SetIcon(m_hIcon, TRUE); // Set big icon 8?rq{&$t
SetIcon(m_hIcon, FALSE); // Set small icon e:K'e2
m_Key.SetCurSel(0); 0$i\/W+
RegisterHotkey(); xf?"Q#
CMenu* pMenu=GetSystemMenu(FALSE); ,&g-DCag
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `4e| I.`^r
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Y5y7ONcn
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ix38|G9U
return TRUE; // return TRUE unless you set the focus to a control qeC^e}h
} oN)I3wO$
RRro.r,
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d6ifJ
{ E
B!
,t
if ((nID & 0xFFF0) == IDM_ABOUTBOX) RU~Pa+H
{ TEbIU8{Y
CAboutDlg dlgAbout; i6S["\h>
dlgAbout.DoModal(); 1d$wP$
} W)^%/lAh
else b~{nS,_Rn
{ q,OCA\
CDialog::OnSysCommand(nID, lParam); *,)1Dcv(
} {{)pb>E
} M,cz7,
5=fS^]- F
void CCaptureDlg::OnPaint() )(rr1^Xer
{ ^Nt^.xi7
if (IsIconic()) w4R~0jXy
{ ><$V:nsEO
CPaintDC dc(this); // device context for painting 3T>6Q#W5eO
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wv=U[:Y
// Center icon in client rectangle i ~)V>x
int cxIcon = GetSystemMetrics(SM_CXICON); 4pZKm-dM^
int cyIcon = GetSystemMetrics(SM_CYICON); ~+,ZD)AKi4
CRect rect; Ur ol)_3X
GetClientRect(&rect); `)kxFD_bH
int x = (rect.Width() - cxIcon + 1) / 2; :2+z_+k}<
int y = (rect.Height() - cyIcon + 1) / 2; 3#aLCpVla
// Draw the icon ^5)=)xVF
dc.DrawIcon(x, y, m_hIcon); {E}D6`{
} xTqP`ljX
else #ApmJLeCO
{ cEn|Q
CDialog::OnPaint();
#Zi6N
} VCT1GsnE
} 7<(kvE*x
\w&R`;b8w
HCURSOR CCaptureDlg::OnQueryDragIcon() Iu(]i?Y
{ ZXf&pqmG
return (HCURSOR) m_hIcon; fF2]7:
} tv2k&\1
` +)Bl%*
void CCaptureDlg::OnCancel() jk Aru_C
{ 06`caG|]-M
if(bTray) r9<#R=r)}J
DeleteIcon(); !|
q19$
CDialog::OnCancel(); roBbo
} } Fli
s#aane
void CCaptureDlg::OnAbout() #TV #*
{ o=PW)37>
CAboutDlg dlg; W"\+jHF"
dlg.DoModal(); ZkdSgc')
} jthyZZ
V2:S
9vO'
void CCaptureDlg::OnBrowse() 4F<was/
{ ScQ9p379
CString str; 9j}Q~v\
BROWSEINFO bi; Q=Q&\.<
char name[MAX_PATH]; -Vs;4-B{9
ZeroMemory(&bi,sizeof(BROWSEINFO)); =>&~p\Aw
bi.hwndOwner=GetSafeHwnd(); QyrB"_dm
bi.pszDisplayName=name; *|cs_,3
bi.lpszTitle="Select folder"; o#D'"Tn!
bi.ulFlags=BIF_RETURNONLYFSDIRS; l\2"u M#7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); F>?~4y,b7
if(idl==NULL) MlLM
$Y-@
return; ,Ww.W'#P
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bIzBY+P
str.ReleaseBuffer(); &'/bnN +R
m_Path=str; 1uEM;O
if(str.GetAt(str.GetLength()-1)!='\\') QtcYFf
g
m_Path+="\\"; DYrci?8Ith
UpdateData(FALSE); %`s1
Ocvp
} |`|zo+aW
9`CJhu
void CCaptureDlg::SaveBmp() iAeq%N1(0
{ BQv*8Hg
B6
CDC dc; @y6^/'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); aU$8 0
CBitmap bm; 0d89>UB-8q
int Width=GetSystemMetrics(SM_CXSCREEN); H> n;[
int Height=GetSystemMetrics(SM_CYSCREEN); Tu^H,vf
bm.CreateCompatibleBitmap(&dc,Width,Height); HIvSh6|0p
CDC tdc; =AF;3
tdc.CreateCompatibleDC(&dc); ) bd`U
CBitmap*pOld=tdc.SelectObject(&bm); Yf1%7+V35
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =tX"aCW~
tdc.SelectObject(pOld); 0Ag2zx
BITMAP btm; D+w?
bm.GetBitmap(&btm); vq\L9$WJ
DWORD size=btm.bmWidthBytes*btm.bmHeight; ?5EMDawt
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W@+ge]9m&
BITMAPINFOHEADER bih; 0Ca/[_
bih.biBitCount=btm.bmBitsPixel; h?fp(
bih.biClrImportant=0; @udc/J$
bih.biClrUsed=0; =(bTS n
bih.biCompression=0; \_)mWK,h
bih.biHeight=btm.bmHeight; p77=~s
bih.biPlanes=1; \ >#y*W<
bih.biSize=sizeof(BITMAPINFOHEADER); zQB1C
bih.biSizeImage=size; T:!H^
bih.biWidth=btm.bmWidth; sdKm@p|/|
bih.biXPelsPerMeter=0; [vnxp/v/<
bih.biYPelsPerMeter=0; |-%dN }O
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yb\!4ml
static int filecount=0; ^a|
CString name; 0&3zBL%Bo
name.Format("pict%04d.bmp",filecount++); :#UA!|nV
name=m_Path+name; M?DXCsZ,)s
BITMAPFILEHEADER bfh; $_|jI
^
bfh.bfReserved1=bfh.bfReserved2=0;
BDX>J3h
bfh.bfType=((WORD)('M'<< 8)|'B'); UI wTf2B
bfh.bfSize=54+size; /<J5?H
bfh.bfOffBits=54; (m')dSZ
CFile bf; #?Ob->v
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ YdYaLTz
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qy-Hv6oof
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %4/X;w\3
bf.WriteHuge(lpData,size); g}BS:#$
bf.Close(); aq9Ej]1b
nCount++; (%fSJCBl[P
} `0=j,54cx
GlobalFreePtr(lpData); N*KM6j
if(nCount==1) " "CNw-^t
m_Number.Format("%d picture captured.",nCount); BtQqUk#L2
else Lf;Uv[^c
m_Number.Format("%d pictures captured.",nCount); |9)y<}c5oM
UpdateData(FALSE); _1jeaV9@
} K~qKr<)
w3Dqpo8E
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n ,@ge
{ l HZ4N{n
if(pMsg -> message == WM_KEYDOWN) -(E-yCu
{ Q.fD3g
if(pMsg -> wParam == VK_ESCAPE) 9 vNz
yh\
return TRUE; o<g1;
if(pMsg -> wParam == VK_RETURN) WaiM\h?=#
return TRUE; ciN*gwI)
} ko~e*31_E
return CDialog::PreTranslateMessage(pMsg); "Fxw"I
<
} )<T2J0*
U.ew6`'Te
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C-(O*hK
{ |e2s{J2
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ fh&Q(:ZU
SaveBmp(); !6J+#
return FALSE; Enhrkk
} zbDK$g6
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p0pA|
CMenu pop; :|=Xh"l"
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); CSr2\ogT
CMenu*pMenu=pop.GetSubMenu(0); y*lAmO
pMenu->SetDefaultItem(ID_EXITICON); 9hhYyqGsO
CPoint pt; py\/m]
GetCursorPos(&pt); wNl "y
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8]J lYe
if(id==ID_EXITICON) "g1Fg.o
DeleteIcon(); @nM+*0
$d
else if(id==ID_EXIT) D Z=OZ.v
OnCancel(); Gx(%AB~9$
return FALSE; ahw0}S
} ?'OL2~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t k+t3+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .b<wNUzP
AddIcon(); lR^W*w4y
return res;
zzX9Q:
} {<2q
l,
-q:8
void CCaptureDlg::AddIcon() w)}@svv"
{ Y_nlIcu
NOTIFYICONDATA data; -M-y*P)
data.cbSize=sizeof(NOTIFYICONDATA); f/i[?
gw
CString tip; \>e>J\t:
tip.LoadString(IDS_ICONTIP); deutY.7g
data.hIcon=GetIcon(0); n:JG+1I
data.hWnd=GetSafeHwnd(); i]0$7s9!
strcpy(data.szTip,tip); wtfM}MW\
data.uCallbackMessage=IDM_SHELL; D!bi>]Yd
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <-!'V,c
data.uID=98; )umW-A
Shell_NotifyIcon(NIM_ADD,&data); h6e,w$IL
ShowWindow(SW_HIDE);
:a M@"#F
bTray=TRUE; nY?X@avo>
} V`LW~P;
m8&XW2S
void CCaptureDlg::DeleteIcon() AKAxfnaR
{ Jv D`RUh
NOTIFYICONDATA data; Cx8
H
data.cbSize=sizeof(NOTIFYICONDATA); ns&(g^
data.hWnd=GetSafeHwnd(); `u7twW*U2
data.uID=98; Ap`D{u/
Shell_NotifyIcon(NIM_DELETE,&data); ~h444Hp=
ShowWindow(SW_SHOW); \3cg\Q+~
SetForegroundWindow(); Cta!"=\
ShowWindow(SW_SHOWNORMAL); =5M
'+>
bTray=FALSE; 1i$OcN?x%
} TK#-;p_
Oz.Zxw
void CCaptureDlg::OnChange() jHc/ EZB
{ oX[I4i%G
RegisterHotkey(); (9!kKMQW'
} :$oi P
15!b]':
BOOL CCaptureDlg::RegisterHotkey() `wNJ*`
{ i$4lBy_2
UpdateData(); q<A,S8'm
UCHAR mask=0; 7x`4P|Uu
UCHAR key=0; "'6R|<u=:
if(m_bControl) 2$oGy
mask|=4; CIf""gL9
if(m_bAlt) Xd9<`gu
mask|=2; W7
9.,#
if(m_bShift) Bqb3[^;~
mask|=1; z';h5GNd>z
key=Key_Table[m_Key.GetCurSel()]; $dHD
if(bRegistered){ w7_2JS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); )"y]_}
bRegistered=FALSE; A;Uw
b
} A*3R@G*h
cMask=mask; 8hvh
xp
cKey=key; X[o"9O|<
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ps=QVX)YP
return bRegistered; g?!;04
} 7>|p_o`e
C,3yu,'
四、小结 u9dL-Nr`
JPS<e*5
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。