| 我又找了一下我大约是在2003年末用过的一个控件，叫“ImageOcx”，是个商用控件，非常不错，我用它把一个BMP文件（1.4M）压缩到了10K左右，感觉还行，所以推荐给大家！ 用到的控件函数为： 函数原型：
RESULT CVIFUNC IMAGEOCXLib__DImageOcxCompressImageOut (CAObjHandle objectHandle, ERRORINFO *errorInfo, const char *pFile1,
const char *pFile2, float fTime, long lType, long *returnValue);
函数功能：压缩位图
函数说明:
pFile1---------源文件
pFile2---------压缩文件
fTime----------倍率
lType----------图像类型 (1=bmp 2=tif)
returnValue----返回值 函数原型：
HRESULT CVIFUNC IMAGEOCXLib__DImageOcxDeCompressImageOut (CAObjHandle objectHandle,
ERRORINFO *errorInfo, const char *pFile1, const char *pFile2,
long *returnValue);
函数功能：还原位图
函数说明:
pFile1---------压缩文件
pFile2---------解压文件
returnValue----返回值
界面为： 代码为： #include "ImageOcx.h"
#include
#include "toolbox.h"
#include
#include
#include
#include "图形压缩.h"
static CAObjHandle objecthandle; static int bitmapID; static int panelHandle; int main (int argc, char *argv[])
{
if (InitCVIRTE (0, argv, 0) == 0)
return -1; /* out of memory */
if ((panelHandle = LoadPanel (0, "图形压缩.uir", PANEL)) < 0)
return -1;
GetObjHandleFromActiveXCtrl (panelHandle, PANEL_IMAGEOCX, &objecthandle);
DisplayPanel (panelHandle);
RunUserInterface ();
DiscardPanel (panelHandle);
if (bitmapID)
{
DiscardBitmap (bitmapID);
}
return 0;
} int CVICALLBACK bmpCB (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int sel;
char path[MAX_PATHNAME_LEN];
long filesize;
switch (event)
{
case EVENT_COMMIT:
sel = FileSelectPopup ("", "*.bmp", "*.bmp", "打开位图", VAL_LOAD_BUTTON, 0, 1, 1, 1, path);
if (sel > 0)
{
GetBitmapFromFile (path, &bitmapID);
CanvasDrawBitmap (panelHandle, PANEL_CANVAS_ORGINAL, bitmapID, VAL_ENTIRE_OBJECT, VAL_ENTIRE_OBJECT);
GetFileSize (path, &filesize);
SetCtrlVal (panelHandle, PANEL_NUMERIC_BMP, filesize);
} break;
}
return 0;
} int CVICALLBACK jpegCB (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int sel;
char path[MAX_PATHNAME_LEN];
long filesize;
switch (event)
{
case EVENT_COMMIT:
if (bitmapID)
{
int ration;
GetCtrlVal (panelHandle, PANEL_NUMERIC_RATION, &ration);
sel = FileSelectPopup ("", "*.jpeg", "*.jpeg", "保存JPG图像", VAL_SAVE_BUTTON, 0, 1, 1, 1, path);
if (sel > 0)
{
SaveBitmapToJPEGFile (bitmapID, path, JPEG_PROGRESSIVE, ration); DisplayImageFile (panelHandle, PANEL_PICTURE_CONVERT, path);
GetFileSize (path, &filesize);
SetCtrlVal (panelHandle, PANEL_NUMERIC_JPGE, filesize);
}
} break;
}
return 0;
} int CVICALLBACK QuitCallback (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:
QuitUserInterface (0);
break;
}
return 0;
} int CVICALLBACK compress (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int sel;
char path[MAX_PATHNAME_LEN];
long ret;
int ration;
switch (event)
{
case EVENT_COMMIT:
sel = FileSelectPopup ("", "*.bmp", "*.bmp", "打开位图", VAL_OK_BUTTON, 0, 1, 1, 1, path);
if (sel > 0)
{
GetCtrlVal (panelHandle, PANEL_NUMERIC_COMRAT, &ration);
IMAGEOCXLib__DImageOcxCompressImageOut (objecthandle, NULL, &path[0], "sample1.cmp", ration, 1, &ret);
DisplayImageFile (panelHandle, PANEL_PICTURE_ORGINAL, path);
}
break;
}
return 0;
} int CVICALLBACK decompress (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int sel;
char path[MAX_PATHNAME_LEN];
long ret;
switch (event)
{
case EVENT_COMMIT:
sel = FileSelectPopup ("", "*.cmp", "*.cmp", "打开压缩位图", VAL_OK_BUTTON, 0, 1, 1, 1, path);
if (sel > 0)
{
IMAGEOCXLib__DImageOcxDeCompressImageOut (objecthandle, NULL, &path[0], "3.bmp", &ret);
DisplayImageFile (panelHandle, PANEL_PICTURE_COMMPRESS, "3.bmp");
}
break;
}
return 0;
} int CVICALLBACK size (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int pheight;
int width;
int height;
static int i = 0;
switch (event)
{
case EVENT_COMMIT:
if ( i == 0)
{
SetPanelAttribute (panelHandle, ATTR_HEIGHT, 700);
SetCtrlAttribute (panelHandle, PANEL_CMD_SIZE, ATTR_LABEL_TEXT, "详细 <<");
i = 1;
}
else
{
SetPanelAttribute (panelHandle, ATTR_HEIGHT, 480);
SetCtrlAttribute (panelHandle, PANEL_CMD_SIZE, ATTR_LABEL_TEXT, "详细 >>");
i = 0;
}
GetScreenSize (&height, &width);
GetPanelAttribute (panelHandle, ATTR_HEIGHT, &pheight);
SetPanelAttribute (panelHandle, ATTR_TOP, (int)((height-pheight)/2)+15);
break;
}
return 0;
}
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