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:
[X /s^42
Is6}VLbB 一、实现方法
5~UW=
^kC!a>& 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:
.>r3ZwrE' `#<UsU,~Lu #pragma data_seg("shareddata")
|RD)pvVM HHOOK hHook =NULL; //钩子句柄
yMyvX_UNI UINT nHookCount =0; //挂接的程序数目
8kcMgCO static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
yaG:}=.3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
8JQ\eF$ma static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
a6xo U;T static int KeyCount =0;
C6F7,v62 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
%t6-wWM97 #pragma data_seg()
>}+R+''nR _UZPQ[ 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)D+FV29y a {x3FQ 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:
Yj bp: ,)dlL tUm BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
a-S
tOO5s cKey,UCHAR cMask)
y'b*Dk{ {
7@g0>1Fz BOOL bAdded=FALSE;
RhB)AUAj for(int index=0;index<MAX_KEY;index++){
rqp]{?33 if(hCallWnd[index]==0){
qAd=i0{N hCallWnd[index]=hWnd;
n8)&1
q?V HotKey[index]=cKey;
$nW9VMa HotKeyMask[index]=cMask;
\p.yR. bAdded=TRUE;
rZ n@i KeyCount++;
>r\GB#\5 break;
#^]vhnbN }
lw~
V }
zx$1.IM"4 return bAdded;
xDl;
tFI }
/TPtPq<7:# //删除热键
N.q*jY=X| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;ow)N <Z {
uD?G\"L
i BOOL bRemoved=FALSE;
Iw.!*0$ for(int index=0;index<MAX_KEY;index++){
%,~\,+NP if(hCallWnd[index]==hWnd){
5oCg&aT if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~4=*kJ#7 hCallWnd[index]=NULL;
~@6l7H6{ HotKey[index]=0;
mj9sX^$dE HotKeyMask[index]=0;
XC;Icr) bRemoved=TRUE;
gjz-CY.hz KeyCount--;
>`WfY(Lq break;
R@pY+d9qp }
/
yBrlf }
/W*Z. }
gd7r9yV return bRemoved;
{K"hlu[ }
O9>$(`@I G{4s~Pco[Q ilK*Xo DLL中的钩子函数如下:
FP=27= L~;(M6Jp LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rOE:
ap|KL {
zdU46|!u BOOL bProcessed=FALSE;
"9c=kqkX if(HC_ACTION==nCode)
b+:J?MR;} {
&wY$G! P if((lParam&0xc0000000)==0xc0000000){// 有键松开
z7AWWr=H switch(wParam)
flC%<V%'- {
<B0f case VK_MENU:
Xj{fM\,"9 MaskBits&=~ALTBIT;
M!i|,S break;
l"}_+5 case VK_CONTROL:
F xm:m MaskBits&=~CTRLBIT;
?$)5NQB% break;
_iq62[i3^ case VK_SHIFT:
qF`6l( MaskBits&=~SHIFTBIT;
YI7M%B9Lj break;
Mth:V45G| default: //judge the key and send message
q! 'p break;
w$9LcN }
2YKa <?_ for(int index=0;index<MAX_KEY;index++){
&qdhxc4 if(hCallWnd[index]==NULL)
IKPGqoM continue;
0mUVa=)D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g;p}
-= {
9NU0K2S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
p$|7T31 * bProcessed=TRUE;
eZU9L/w: }
@j}%{Km]Y }
MaHP):~ }
MomHSv Q\ else if((lParam&0xc000ffff)==1){ //有键按下
7p Y :.iVO switch(wParam)
`ROHB@- {
}]mxKz case VK_MENU:
mrnPZf i MaskBits|=ALTBIT;
1F5KDWtE break;
e*lL. case VK_CONTROL:
7CuZ7!>$ MaskBits|=CTRLBIT;
}kr?+)wB break;
;XawEG7" U case VK_SHIFT:
T#3@r0M MaskBits|=SHIFTBIT;
/A-WI x break;
a=j'G]= default: //judge the key and send message
lD3nz<p break;
37jxl+ }
Pb8@owG8 for(int index=0;index<MAX_KEY;index++){
"#o..?K if(hCallWnd[index]==NULL)
KsOWTq"uj continue;
P* `*^r3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W +ER'lX {
jmkOu5@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/IRXk[ bProcessed=TRUE;
n:`f.jG | }
gHstdp_3 }
9ZJ 8QH }
=8?Kn@nMN if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|SjRss:i+ for(int index=0;index<MAX_KEY;index++){
6^'BTd if(hCallWnd[index]==NULL)
qJdlZW< continue;
)'U0n`= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZzupK^5Z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
i}DS+~8v //lParam的意义可看MSDN中WM_KEYDOWN部分
kc^,V|Nbq6 }
@pYEzizP7 }
aU_Hl+; }
rT/r"vr return CallNextHookEx( hHook, nCode, wParam, lParam );
f2;.He }
:+PE1=v + tMf&BZ 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:
\$wkr s||" } l BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
:NF4[c BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
PY^#hC5: qtZ?
kJ 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:
PT6]qS'1 1Q>nS[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{jz`K1 {
bu]"?bc if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
:HO5
T {
<ErX<(0`ig //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
)|lxzlk SaveBmp();
pqfX}x return FALSE;
3J+2#ML }
?qaWt/m …… //其它处理及默认处理
>SK:b/i }
]h,rgO; |R0f--; lQ;BI~ 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。
z~ C8JY: VX$WL"A 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。
f
5v&4 ?@.v*'qR 二、编程步骤
Jo\P,-\( =+!l8o&o, 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";
3OZPy|".ax ;ItH2Lw<& 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
AzOs/q8O ;2<5^hgk 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;
<:}nd:l1 H3D<"4Q> 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;
8D*nU3O EsMX#1>/m 5、 添加代码,编译运行程序。
-BSdrP| v4n< G- 三、程序代码
I x%>aee kUf i ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Mqr_w!8d #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
!5o j~H #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
e|\xFV=4 #if _MSC_VER > 1000
IW0S*mO$ #pragma once
n:%4SZn #endif // _MSC_VER > 1000
9D3{[ #ifndef __AFXWIN_H__
by/H:5}7 #error include 'stdafx.h' before including this file for PCH
}4A] x`3 #endif
qSc-V`* #include "resource.h" // main symbols
ef7{D
P class CHookApp : public CWinApp
@KQ.t F* {
gJ
\6cZD public:
Tnp
P ' CHookApp();
G](4!G& // Overrides
gc.Lh~ // ClassWizard generated virtual function overrides
&J>e;X //{{AFX_VIRTUAL(CHookApp)
N*o{BboK; public:
f"ndLX:'} virtual BOOL InitInstance();
5qb93E"C virtual int ExitInstance();
{]T?) !Vm //}}AFX_VIRTUAL
f4"UI-8;n //{{AFX_MSG(CHookApp)
:RIz6Tz // NOTE - the ClassWizard will add and remove member functions here.
QrYF Lh // DO NOT EDIT what you see in these blocks of generated code !
p{g4`o //}}AFX_MSG
;Bs~E DECLARE_MESSAGE_MAP()
h1w({<q*ov };
l6/VJ~(}' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/4&gA5BS] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1!<t8,W4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%F;BL8d BOOL InitHotkey();
=nhY;pY3u BOOL UnInit();
[7Lr" #endif
8s1nE_3 ~L)~p%rbi //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
fMUcVTFe #include "stdafx.h"
lG7PM^Eb #include "hook.h"
=-h^j #include <windowsx.h>
cS;3,#$ #ifdef _DEBUG
ubcB<=xb #define new DEBUG_NEW
g+ c*VmY #undef THIS_FILE
s#9q3JV0 static char THIS_FILE[] = __FILE__;
wFJf"@/vJ #endif
7~Y\qJ4b #define MAX_KEY 100
>h\y1IrAaG #define CTRLBIT 0x04
$DL}jH^S #define ALTBIT 0x02
6 c_#"4 #define SHIFTBIT 0x01
jRJG .hcB5 #pragma data_seg("shareddata")
xZ'fer`& HHOOK hHook =NULL;
5=pE*ETJ UINT nHookCount =0;
Xz_WFLq4 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ZL(
j5E static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&93{>caf+ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
7Sx|n}a-3 static int KeyCount =0;
z'YWomfZm static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
:@(('X(". #pragma data_seg()
ldA_mj{ HINSTANCE hins;
t'n@yX_ void VerifyWindow();
S,m( BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
~:ASv>m //{{AFX_MSG_MAP(CHookApp)
*w+'I*QSt~ // NOTE - the ClassWizard will add and remove mapping macros here.
2q~.,vpP // DO NOT EDIT what you see in these blocks of generated code!
_~<sb,W //}}AFX_MSG_MAP
e"E8BU END_MESSAGE_MAP()
uvId],dQ5 OQ-)
4Uk} CHookApp::CHookApp()
!HY^QK {
UA>=#
$ // TODO: add construction code here,
u]yy%@U1 // Place all significant initialization in InitInstance
PkvW6,lS }
G4*
LO #Rw!a#CX. CHookApp theApp;
J(7#yg%5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!oWB5x~:P {
m'rDoly"62 BOOL bProcessed=FALSE;
U,Z\)+-R if(HC_ACTION==nCode)
(RddR{mX {
lvW
T if((lParam&0xc0000000)==0xc0000000){// Key up
&jE\D^>ko switch(wParam)
nK>CPqB^( {
YX$(Sc3.6 case VK_MENU:
'+88UFSq5 MaskBits&=~ALTBIT;
J p'^! break;
{L-^J`> G case VK_CONTROL:
EXDDUqZ5\ MaskBits&=~CTRLBIT;
>8f~2dH2% break;
O$ *lPA[ case VK_SHIFT:
6{h\CU}" MaskBits&=~SHIFTBIT;
{9@D zP break;
8y
LcTA$T default: //judge the key and send message
}]x \ `}o break;
nLN0zfhE# }
HpnF,4A> for(int index=0;index<MAX_KEY;index++){
UB$}`39@ if(hCallWnd[index]==NULL)
j-<-!jTd
continue;
]
ZV[}7I. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[`n_> p! {
`Fd
\dn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
GA^hev bProcessed=TRUE;
? i{?Q, }
aI=p_+.h }
6jq*lnA% }
q0.!T0i else if((lParam&0xc000ffff)==1){ //Key down
cl& w/OJ# switch(wParam)
(i~UH04r>s {
\<7Bx[/D4 case VK_MENU:
%*D=ni#(sT MaskBits|=ALTBIT;
Qit&cnO break;
z|#*c5Y9w case VK_CONTROL:
qG9a!sj MaskBits|=CTRLBIT;
dyQ7@K.E break;
k2 }DBVu1 case VK_SHIFT:
67j kU! MaskBits|=SHIFTBIT;
j~q 7v
`": break;
y=Y k$:-y default: //judge the key and send message
Q]WBH_j break;
:?M_U;;z2+ }
H$`U]
=s| for(int index=0;index<MAX_KEY;index++)
z !K2UTX {
7HPwlS if(hCallWnd[index]==NULL)
jSI1tW8 continue;
fn}E1w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~+Wx\:TT {
vjEDd`jYZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Mu3G/|t( bProcessed=TRUE;
, $ 7-SN }
WVP?Ie8 }
"N+4TfXy }
s)-An(Uw if(!bProcessed){
7-744wV}Z for(int index=0;index<MAX_KEY;index++){
(\6E.Z# if(hCallWnd[index]==NULL)
K9N31' continue;
g}_2T\$k if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
%1?t)Bg SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_XZ
Gj:V }
lp`j3) }
0#V"
}
be+-p return CallNextHookEx( hHook, nCode, wParam, lParam );
l2F#^=tp }
E !kN h /YJo"\7 BOOL InitHotkey()
01.q9AGy {
/~,*DH$) if(hHook!=NULL){
}B0[S_mw nHookCount++;
<"3q5ic/Z return TRUE;
[jgVN w""D }
72nZ`u else
)tlj{ 7p hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
EyK!'9~a if(hHook!=NULL)
od
`;XVG nHookCount++;
7KgaXi3r return (hHook!=NULL);
Cy-p1s }
ZF>:m> BOOL UnInit()
a6Vfd& {
a*p|Ij if(nHookCount>1){
9vRLM*9| nHookCount--;
t0e6iof^o return TRUE;
>Na. C(DZ }
&M|rRd~* BOOL unhooked = UnhookWindowsHookEx(hHook);
/stvNIEa if(unhooked==TRUE){
mV}bQ^*?Z nHookCount=0;
xp|1yud hHook=NULL;
RP~nLh3=\ }
t|U5]$5 return unhooked;
tA1?8`bQ }
bB<S4@jF8z 6,q0F*q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u!X~!h-6~ {
[RBSUOF BOOL bAdded=FALSE;
gSFZ>v*6 for(int index=0;index<MAX_KEY;index++){
8F[];LF> if(hCallWnd[index]==0){
!oH{=.w hCallWnd[index]=hWnd;
6 IvAs-%W HotKey[index]=cKey;
.$\-{) HotKeyMask[index]=cMask;
2J=`"6c bAdded=TRUE;
d(^8#4
KeyCount++;
Bz'.7"
":0 break;
jf)cDj2 }
^\PRzY }
';R]`vWFe return bAdded;
4U dk# }
> TYDkEs0 |X@s {? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vA6`};| {
4b<|jVl\ BOOL bRemoved=FALSE;
;!f='QuA for(int index=0;index<MAX_KEY;index++){
i$kB6B#== if(hCallWnd[index]==hWnd){
WN]k+0# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d>[i*u,]/ hCallWnd[index]=NULL;
b36{vcs~ HotKey[index]=0;
"rMfe>;FJ HotKeyMask[index]=0;
p&I>xu8fl bRemoved=TRUE;
`R0~mx&6G KeyCount--;
<lzC|>BG break;
OV{v6,>O }
lITd{E,+r }
82FEl~,^E }
h[dJNawL return bRemoved;
QPm[4Fd{G }
7 7bwYKIn 2S_u/32]W void VerifyWindow()
T.cTL.} {
FWu:5fBZY for(int i=0;i<MAX_KEY;i++){
/)[-5n{ if(hCallWnd
!=NULL){ Z"c-Ly{vEj
if(!IsWindow(hCallWnd)){ U-DQ?OtmC@
hCallWnd=NULL; +E.
D:
HotKey=0; =cRmaD
HotKeyMask=0; 2Pb+/1*ix
KeyCount--; d5-Q}D,P
} PxYK)n9&
} ?Tc|3U
} '=nmdqP
} zWo
DOu^
BOOL CHookApp::InitInstance() igL5nE=n
{ oI#TjF
AFX_MANAGE_STATE(AfxGetStaticModuleState()); +788aK,{#
hins=AfxGetInstanceHandle();
kb 74:
InitHotkey(); 7=G6ao7
return CWinApp::InitInstance(); 0V6, &rTF
} q25p3
o|>=<l
int CHookApp::ExitInstance() ="]lN
{ E 14DZ
VerifyWindow(); c)
Eu(j\#
UnInit(); 8(j]=n6r
return CWinApp::ExitInstance(); XOX$uLm
} 4x
?NCD=k
], Bafz)4
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2{RRaUoRb
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bbq`gEV
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OybmyGHY
#if _MSC_VER > 1000 e!0xh
#pragma once 2MB>NM<xO
#endif // _MSC_VER > 1000 ajkV"~w',|
F3V:B.C
class CCaptureDlg : public CDialog GTOA>RB2
{ mNC?kp
// Construction @5&57R3>
public: gGE{r}$
BOOL bTray; W/A@q o"
BOOL bRegistered; sT =|"H?
BOOL RegisterHotkey(); #}fvjJ{
UCHAR cKey; @|;[
;:h@
UCHAR cMask; +o3n%( ^~
void DeleteIcon(); {8mJ<b>VA
void AddIcon(); 6Z1O:Bou
UINT nCount; `yq)
y>_
void SaveBmp(); pS-o*!\C.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor *CGHp8
// Dialog Data xj33g6S
//{{AFX_DATA(CCaptureDlg) d_(;sW"I
enum { IDD = IDD_CAPTURE_DIALOG }; <zY#qFQ2
CComboBox m_Key; R6X2d\l#
BOOL m_bControl; 8m
H6?,@6
BOOL m_bAlt; +Y*4/w[
BOOL m_bShift; =mQY%l
CString m_Path; b&A/S$*
CString m_Number; wx-&(f
//}}AFX_DATA +)h# !/
// ClassWizard generated virtual function overrides zEQQ4)mA
//{{AFX_VIRTUAL(CCaptureDlg) xBc$qjV
public: N6kMl
virtual BOOL PreTranslateMessage(MSG* pMsg); O<wH+k[
protected: xK0;saG#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [Cd#<Te3
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); RPMz&/k
//}}AFX_VIRTUAL Xgh%2;:
// Implementation qPi $kecx
protected: p]X+#I<
HICON m_hIcon; D*46,>Tv
// Generated message map functions ~{g/
//{{AFX_MSG(CCaptureDlg) m.6uLaD"!}
virtual BOOL OnInitDialog(); z1tD2jL _
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); pqv l,G5
afx_msg void OnPaint(); c>c3qjWY/
afx_msg HCURSOR OnQueryDragIcon(); i:N-Q)<Q*)
virtual void OnCancel(); \8*j"@ !H
afx_msg void OnAbout(); us5Zi# }
afx_msg void OnBrowse(); kLs{B
afx_msg void OnChange(); %iPIgma
//}}AFX_MSG sMAH;'`!Eu
DECLARE_MESSAGE_MAP() &Odrq#o?R
}; xP9R
d/xa|
#endif {|%^'lS
P{s1NorKDh
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PRYm1Y
#include "stdafx.h" dC4`xUv
#include "Capture.h" 3#""`]9H
#include "CaptureDlg.h" `6Q+N=k~Z
#include <windowsx.h> aA*h *
#pragma comment(lib,"hook.lib") XmO]^ `
#ifdef _DEBUG 6qV1_M#
#define new DEBUG_NEW ~K)FuL[*
#undef THIS_FILE s%#u)nw19
static char THIS_FILE[] = __FILE__; ;=%cA#}_0
#endif ]ml 'd
#define IDM_SHELL WM_USER+1 $0{h Uex
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $h8?7:z;um
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y$^vA[]c>
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~y Dl& S
class CAboutDlg : public CDialog |VE.khq#
{ `{yD\qDyX
public: +|oLS_
CAboutDlg(); e?XGv0^qu
// Dialog Data &9Z@P[f
//{{AFX_DATA(CAboutDlg) +yr~UP_
}
enum { IDD = IDD_ABOUTBOX }; %;_EWs/z8
//}}AFX_DATA i5WO)9Us
// ClassWizard generated virtual function overrides dqU)(T=C
//{{AFX_VIRTUAL(CAboutDlg) a{;+_J3S
protected: -'oxenu
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ss{5'SF)$c
//}}AFX_VIRTUAL ]9<H[5>$R
// Implementation !#5y%Bf
protected: )g&nI<Mh
//{{AFX_MSG(CAboutDlg) w4^$@GtN
//}}AFX_MSG ^eV K.
DECLARE_MESSAGE_MAP() }f{5-iwD}
}; s)'+,lKw
B'B0 e`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~y 2joStx
{ vPZ0?r_5W
//{{AFX_DATA_INIT(CAboutDlg) 0aGauG[
//}}AFX_DATA_INIT HWL? doM
} 0|hOoO]?q&
2c,w
4rK
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GAR6nJCz
{ 2nFr?Y3g,
CDialog::DoDataExchange(pDX); (Q&jp!WU
//{{AFX_DATA_MAP(CAboutDlg) isnpSN"z
//}}AFX_DATA_MAP C{-Dv-<A>
} h^."wv
zEE:C|50
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E9.1~
)
//{{AFX_MSG_MAP(CAboutDlg) 2:[<E2z
// No message handlers ,ueA'GZ
//}}AFX_MSG_MAP *|+$7j
END_MESSAGE_MAP() ;]BNc"
mCI5^%*0jQ
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'w;J)_Yc2
: CDialog(CCaptureDlg::IDD, pParent) ]G!
APE
{ C-Y7n5
//{{AFX_DATA_INIT(CCaptureDlg) z`J-J*R>d
m_bControl = FALSE; g]b%<DJ
m_bAlt = FALSE; 21?>rezJ
m_bShift = FALSE; pXNH
m_Path = _T("c:\\"); aO:A pOAO
m_Number = _T("0 picture captured."); |f}`uF
nCount=0; +miL naO~L
bRegistered=FALSE; '7]9q#{su
bTray=FALSE; 5 "x1Pln
//}}AFX_DATA_INIT obX2/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ZE/Aj/7Qy
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ox aS<vQ3
} wxG*mOw
0KZsWlD:L
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s BuXwa
{ z.t,qi$;{U
CDialog::DoDataExchange(pDX); ~a>3,v-
//{{AFX_DATA_MAP(CCaptureDlg) Ac>GF
DDX_Control(pDX, IDC_KEY, m_Key); -zH-9N*c
DDX_Check(pDX, IDC_CONTROL, m_bControl); TU| 0I
DDX_Check(pDX, IDC_ALT, m_bAlt); Pj^Ccd'>=
DDX_Check(pDX, IDC_SHIFT, m_bShift); >LU !Z
DDX_Text(pDX, IDC_PATH, m_Path); xLbF9ASim
DDX_Text(pDX, IDC_NUMBER, m_Number); +jGUp\h%9;
//}}AFX_DATA_MAP Vx n-
} 1ww~!R
&9n=!S'Md
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Y=UN`vRR
//{{AFX_MSG_MAP(CCaptureDlg) h9%.tGx
ON_WM_SYSCOMMAND() 1(VskFtZF
ON_WM_PAINT() z)&&Ym#
ON_WM_QUERYDRAGICON() 0NSCeq%;6q
ON_BN_CLICKED(ID_ABOUT, OnAbout) rsK
b9G
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U<yKC8
ON_BN_CLICKED(ID_CHANGE, OnChange) w 3L+7V,!
//}}AFX_MSG_MAP $yZP"AsAR
END_MESSAGE_MAP() 51>OwEf<R
[!#;QQ&M
BOOL CCaptureDlg::OnInitDialog() U,`F2yD/!
{ BQ~\ p\
CDialog::OnInitDialog(); gqAN-b'
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S.fb[gI]
ASSERT(IDM_ABOUTBOX < 0xF000); %C >Win)g
CMenu* pSysMenu = GetSystemMenu(FALSE); PiX(Ase
if (pSysMenu != NULL) |P"kJ45
{ AIwp2Fz
CString strAboutMenu; HxShNU
strAboutMenu.LoadString(IDS_ABOUTBOX);
A^pRHbRq
if (!strAboutMenu.IsEmpty()) V#PT.,Xa.
{ |uA /72
pSysMenu->AppendMenu(MF_SEPARATOR); B{Lzgw u;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L<N=,~
} $I3}%'`+
} }Do$oyAV$G
SetIcon(m_hIcon, TRUE); // Set big icon V#-8[G6Ra
SetIcon(m_hIcon, FALSE); // Set small icon 4L2TsuLw
m_Key.SetCurSel(0); a&`Lfw"
RegisterHotkey(); ]u
>~:
CMenu* pMenu=GetSystemMenu(FALSE); `[4{]jX+<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z@#kivcpz
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g^2H(}frc
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);
["Jt2
return TRUE; // return TRUE unless you set the focus to a control A@ G%*\UZ
} mLeK7?GL
VSm{]Z!x
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GplEad
$
{ dMH}%f5;1
if ((nID & 0xFFF0) == IDM_ABOUTBOX) w5Yt mnP
{ `HM?Fc58
CAboutDlg dlgAbout; -sk!XWW+
dlgAbout.DoModal(); #Ic-?2Gn4<
} ~w$ ^`e!]
else TC._kAm
{ ;[j)g,7{
CDialog::OnSysCommand(nID, lParam); Mg{=(No
} &o)eRcwH`
} WS ^%<
h#
ohB@ij C!
void CCaptureDlg::OnPaint() ncij)7c)u
{ ~$ "P\iJ
if (IsIconic()) K!SFS
{ 140_WV?7
CPaintDC dc(this); // device context for painting <SNu`,/I
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,S=ur%
// Center icon in client rectangle Md1ePp]
int cxIcon = GetSystemMetrics(SM_CXICON); a"X9cU[
int cyIcon = GetSystemMetrics(SM_CYICON); #;>v,Jo
CRect rect; ]KRw[}z
GetClientRect(&rect); 2xpI|+a%
int x = (rect.Width() - cxIcon + 1) / 2; |VML.u:N
int y = (rect.Height() - cyIcon + 1) / 2; n ]P,5
// Draw the icon b(:U]>J
dc.DrawIcon(x, y, m_hIcon); WQYw@M~4Q!
} e[L%M:e9U
else #uH%J<U
{ (wZ/I(4
CDialog::OnPaint(); S8)6@ECC
} Jm*wlN
[>
} rTtxmw0
b*"%E,?
HCURSOR CCaptureDlg::OnQueryDragIcon() +T]D\];D
{ X?OH//co
return (HCURSOR) m_hIcon; .0'FW!;FV
} &^^V*O
5g;i{T/6~x
void CCaptureDlg::OnCancel() |]x>|Z?/u
{ </jTWc'}
if(bTray) qgw)SuwW
DeleteIcon(); 77p8|63
CDialog::OnCancel(); p u6@X7W"
} 3 etW4
GC^>oF
void CCaptureDlg::OnAbout() <Is~DjIav
{ tx||<8
CAboutDlg dlg; jZ> x5 W
dlg.DoModal(); 5Z*6,P0
} % (x9~"
YS+|n%?
void CCaptureDlg::OnBrowse() zqa7!ky
{ FWDAG$K@0
CString str; C{U"Nsu+1
BROWSEINFO bi; 'o]8UD(
char name[MAX_PATH]; RD0=\!w *5
ZeroMemory(&bi,sizeof(BROWSEINFO)); 8(""ui8
bi.hwndOwner=GetSafeHwnd(); pt=H?{06
bi.pszDisplayName=name; ]}0QrD
bi.lpszTitle="Select folder"; &Z6s\r%
bi.ulFlags=BIF_RETURNONLYFSDIRS; *VgiJ
LPITEMIDLIST idl=SHBrowseForFolder(&bi); C0 %yGLh&
if(idl==NULL) SK;c
D>)
return; o==:e
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3DS&-rN
str.ReleaseBuffer(); Iju9#b6
m_Path=str; F!&$Z
.
if(str.GetAt(str.GetLength()-1)!='\\') :"I!$_E'
m_Path+="\\"; yJ?S7+b
UpdateData(FALSE); q=`i
} Dt=@OZW
KetNFwbUf
void CCaptureDlg::SaveBmp() /V$U%0
{ 8zzY;3^h;
CDC dc; `(o:;<&3
dc.CreateDC("DISPLAY",NULL,NULL,NULL); -]kvM
CBitmap bm; ;HoBLxb P
int Width=GetSystemMetrics(SM_CXSCREEN); .l$:0a
int Height=GetSystemMetrics(SM_CYSCREEN); h0)Dj(C
bm.CreateCompatibleBitmap(&dc,Width,Height); k}FmdaPI'
CDC tdc; I::|d,bR!
tdc.CreateCompatibleDC(&dc); |!E: [UH
CBitmap*pOld=tdc.SelectObject(&bm); JBt2R=
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); H[D<G9:
tdc.SelectObject(pOld); 0*yD
BITMAP btm; cZlDdr%
bm.GetBitmap(&btm); EE$\8Gx']!
DWORD size=btm.bmWidthBytes*btm.bmHeight; )uu1AbT+e
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9vI<\
Xa
BITMAPINFOHEADER bih; T1=T
bih.biBitCount=btm.bmBitsPixel; ZfP$6%;_
bih.biClrImportant=0; G_/DzJBF
bih.biClrUsed=0; z^^)n
bih.biCompression=0; N|\Q:<!2_w
bih.biHeight=btm.bmHeight; z~(3S8$
bih.biPlanes=1; z1S
p'h$
bih.biSize=sizeof(BITMAPINFOHEADER); xTg=oq
bih.biSizeImage=size; N`et]'_A}
bih.biWidth=btm.bmWidth; ;9$71E
bih.biXPelsPerMeter=0; &$g{i:)Z
bih.biYPelsPerMeter=0; ;7E
c'nC4
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &OsO _F
static int filecount=0; <sli!rv
CString name; F(KsB5OY?
name.Format("pict%04d.bmp",filecount++); w?:tce
name=m_Path+name; @A'@%Zv-
BITMAPFILEHEADER bfh; 'M!M$<j
bfh.bfReserved1=bfh.bfReserved2=0; Lz{z~xNHW.
bfh.bfType=((WORD)('M'<< 8)|'B'); aI;-NnC
bfh.bfSize=54+size; ^xm%~
bfh.bfOffBits=54; Mqv[7.|
CFile bf; h0a|R4J
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D0^h;wJ=4+
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /odDJxJ
k
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *WaqNMD[%
bf.WriteHuge(lpData,size); N> xdX5
bf.Close(); j9xu21'!%
nCount++; )k.}>0K |
} zd|n!3;
GlobalFreePtr(lpData); 5y8VA4L/o
if(nCount==1) c*.-mS~Z`
m_Number.Format("%d picture captured.",nCount); @L$!hTaP
else yQ0:M/r;0
m_Number.Format("%d pictures captured.",nCount); G&
m~W
UpdateData(FALSE); je85G`{DC
}
s>*xAIx
<.".,Na(J0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i936+[
{ V:h7}T95
if(pMsg -> message == WM_KEYDOWN) O',Vce$
{ f0&%
if(pMsg -> wParam == VK_ESCAPE) Q$(Fma 4a
return TRUE; ;2 P
if(pMsg -> wParam == VK_RETURN) Z\3~7Ek2m
return TRUE; &EmG\vfE
} {B-*w%}HU
return CDialog::PreTranslateMessage(pMsg); IGNU_w4j
} ,&.$r/x|?
>#VNA^+t
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LwYWgT\e
{ :g ~_
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ slzB#
SaveBmp(); Q[{RNab
return FALSE; 5]xSK'6W
} CEW1T_1U<\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LXqPNVp#
CMenu pop; P ; h8
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?N^1v&Q
CMenu*pMenu=pop.GetSubMenu(0); dXfLN<nD>U
pMenu->SetDefaultItem(ID_EXITICON); 0j;q^>
CPoint pt; yd=b!\}WJ
GetCursorPos(&pt); *3)kr=x
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5;+KMM:zb
if(id==ID_EXITICON) ,x$^^
DeleteIcon(); XBoq/kbw!
else if(id==ID_EXIT) |az2vD6P
OnCancel(); )k;;O7Ck
return FALSE; 5|5p -B
} HuJc*op-6
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c?N,Cd~q
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #_{Q&QUk
AddIcon(); /,`OF/%
return res; WdH/^QvTP
} qVfl6q5
K)U[xS;<
void CCaptureDlg::AddIcon() T<-_#}.Hn
{ Ss%1{s~ok
NOTIFYICONDATA data; ~Up{zRD"B
data.cbSize=sizeof(NOTIFYICONDATA); 4(p`xdr}K
CString tip; s VHk;:e>x
tip.LoadString(IDS_ICONTIP); n*Uk<_WA
data.hIcon=GetIcon(0); .G#li(NWH
data.hWnd=GetSafeHwnd(); hD=.rDvO
strcpy(data.szTip,tip); |c^ ?tR<
data.uCallbackMessage=IDM_SHELL; }wkY`"
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <v'&Pk<
data.uID=98; )U=]HpuzI
Shell_NotifyIcon(NIM_ADD,&data); sM+~x<}0
ShowWindow(SW_HIDE); tj$[szo
bTray=TRUE; 2,wwI<=E'
} BM'!odRv
"F%JZO51
void CCaptureDlg::DeleteIcon() [q Uv|l1
{ vxHFNGI
NOTIFYICONDATA data; r!
HXhl
data.cbSize=sizeof(NOTIFYICONDATA); X
=%8*_
data.hWnd=GetSafeHwnd(); le]~Cy0
data.uID=98; x x4GP2
Shell_NotifyIcon(NIM_DELETE,&data); N#2ldY *
ShowWindow(SW_SHOW); =YTcWB
SetForegroundWindow(); - Z`RKR8C
ShowWindow(SW_SHOWNORMAL); H>A6VDu
bTray=FALSE; JJM<ywPGp
} 2 rr=FJ
pQK SPr
void CCaptureDlg::OnChange() =MMd&
{ }zx
~
RegisterHotkey(); !1fZ7a
} ),-gy~
)Qd
x
BOOL CCaptureDlg::RegisterHotkey() ddyX+.LMk
{ HC/z3b;
UpdateData(); !3Pbu=(cte
UCHAR mask=0; !Av9?Q:
UCHAR key=0; r4fHD~#l{
if(m_bControl) c(e>Rmh
mask|=4; p |1u,N
if(m_bAlt) h='F,r5#2
mask|=2; #
)y/aA
if(m_bShift) [ r8 ZAS
mask|=1; U!`iKy-
key=Key_Table[m_Key.GetCurSel()]; B+snHabS6
if(bRegistered){ !TJ,:c]4{!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); C!a1.&HHZ7
bRegistered=FALSE; 7oWMjw\
} XIbZ_G^ +D
cMask=mask; -^lc-$0
cKey=key; 94?WL
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); UhpJG O
return bRegistered; ?UZt30|1
} d.^g#&h
(XQuRL<X
四、小结 6:O<k2=2
}}{n|l+R5
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。