References ▼
The JPEGWEBTUNERDLGPARAMS structure provides information used to initialize the dialog box created by the L_DlgJPEGWebTuner function. After the user closes the dialog box, this structure is updated with information about the user's selections.
typedef struct _JPEGWEBTUNERDLGPARAMS{L_UINT uStructSize;pBITMAPHANDLE pBitmap;L_BOOL bZoomToFit;L_INT nQuality;L_INT nFormat;L_BOOL bProgressive;L_BOOL bWithStamp;L_UINT32 uDlgFlags;LTCOMMDLGHELPCB pfnHelpCallback;L_VOID *pHelpCallBackUserData;} JPEGWEBTUNERDLGPARAMS, * LPJPEGWEBTUNERDLGPARAMS;
Size of this structure, in bytes. Use the sizeof operator to calculate this value.
Pointer to the bitmap handle that references the bitmap used for preview or processing.
Flag that indicates the initial zoom level for previewing the image. Possible values are:
| Value | Meaning |
|---|---|
| TRUE | Set the initial zoom level to "Zoom to fit". |
| FALSE | Set the initial zoom level to "Normal (1:1)". |
Value that indicates the degree of loss in the compression process. Valid values are between 2 (highest quality) and 255 (smallest file size) For more information, refer to the Compression Quality Factors Compression Quality Factors.
Value that indicates the sub format to use. Possible values are:
| Value | Meaning |
|---|---|
| FILE_JFIF | JPEG File Interchange Format with YUV 4:4:4 color space and Lossless |
| FILE_LEAD1JFIF | JPEG File Interchange Format with YUV 4:2:2 color space |
| FILE_LEAD2JFIF | JPEG File Interchange Format with YUV 4:1:1 color space |
Flag that indicates whether to save the JPEG image as a progressive image. Progressive images are useful when transmitting images, because the first part of the file contains the full dimensions of the image. Therefore, in a paint-while-load routine, you can display the whole image, and then progressively clarify it as the rest of the file loads. Possible values are:
| Value | Meaning |
|---|---|
| TRUE | Save the JPEG image as a progressive image. |
| FALSE | Do not save the JPEG image as a progressive image. |
Flag that indicates whether to save the image with a stamp. A stamp is a small thumbnail image saved in addition to the normal image in same file. Possible values are:
| Value | Meaning |
|---|---|
| TRUE | Save the image with a stamp. |
| FALSE | Save the image without a stamp. |
User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:
| Value | Meaning |
|---|---|
| DLG_JPEGWEBTUNER_SHOW_CONTEXTHELP | [0x00000001] Dialog should contain a context sensitive help icon. |
| DLG_JPEGWEBTUNER_SHOW_PREVIEW | [0x00000002] Show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap. |
| DLG_JPEGWEBTUNER_SHOW_TOOL_ZOOMLEVEL | [0x00000004] Show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_JPEGWEBTUNER_SHOW_PREVIEW flag must be set in order to show these buttons. |
| DLG_JPEGWEBTUNER_SHOW_INFORMATION | [0x00000008] Show the Information group of controls. |
| DLG_JPEGWEBTUNER_SHOW_SAVETHUMBNAIL | [0x00000010] Show the Save Thumbnail control. |
| DLG_JPEGWEBTUNER_SHOW_OPTIONS | [0x00000100] Show the Options group of controls. |
| DLG_JPEGWEBTUNER_SHOW_EXPORT | [0x00000200] Show the Export button instead of the OK button. |
Pointer to an optional help callback function. If you do not wish to provide help to this dialog, use NULL as the value of this parameter. To provide help to this dialog, use the function pointer as the value of this parameter. The callback function must adhere to the prototype described in LTCOMMDLGHELPCB.
Void pointer that you can use to pass one or more additional parameters that the callback function needs. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pHelpCallBackUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.